1633 posts • joined Friday 15th June 2007 09:17 GMT
WTF are you talking about!
Any AIX code that is compiled with the compiler defaults will work. It just does, and has done for years.
There is a good chance (greater than 80%) that if you pulled a binary compiled for RS64 or Power2, or even the original RIOS chipsets from a system running AIX 4.3.2 or later, and placed it *WITHOUT CHANGE* on an AIX 6.1 system running Power7, it would run.
*IF* you are talking about extracting every ounce of performance for some code, then I agree that if you have optimized the code for cach size and processor affinity or the particular properties of the floating point pipeline (as is being done where I work currently) or any number of other factors, you will need to re-compile it with the relevant options to get the best performance, but even then the Power6 optimized code will probably run on Power7. This is not new nor specific to IBM processors, and hasn't been ever since I was working on PDP/11's and VAXes.
It is acknowledged that there will be a different execution profiles for Power7 from Power6. The design requirements for the processor were different, and I talk to some worried people talking about how scalable their model is at the moment. We currently have some code that tops out at about 768 processors, and gets worse if you increase the number above this. If the overall clock speed is dropped without a corresponding increase in the number of instructions per clock cycle, then this code may well be slower on Power7 than Power6.
But it's not certain. The speed of the level 3 cache, together with the less deep pipeline required for slower clock speeds may just offset the drop in overall clock speed (pipeline stalls become less of a problem). And as the bottleneck with the code is in inter-thread communication, the high bandwidth between cores on the same die, and on the same QCM may also offer realistic hope of performance gain. And the interconnect between the nodes in an IH supernode should also perform better than what is currently used. And I believe that the number of possible in-flight speculative execution threads possible with more available execution units may reduce pipeline stalls even more.
Remember the Pentium 4 vs. Pentium 3 debacle, where a Pentium 3 at the same clock speed out performed the Pentium 4 when it was first launched, and the follow up Pentium M and D processors dropped the clock speed and again outperformed a Pentium 4.
The talk of in-order vs. out-of-order is bogus. The results for the same stream of instructions should be the same regardless of whether it is in-order or out-of-order. If it's not, the processor is broken. The difference is that out-of-order may allow the hardware instruction scheduler to better utilize the available execution units, leading to more-instructions per clock.
And anyway, the only applications that really are affected by the clock speed are speed-daemon floating point hungry single threaded research types of workloads. From my 30+ years of experience, this is a very small (but admittedly valuable) part of the AIX customer base.
For your commercial workload customer, the difference between Power5, Power6 and Power7 architecture and instruction sets will be largely ignorable. What will be more important is the number of cores, the number of simultaneous threads that can be executed and the memory constraints of the hardware. For these customers, the application providers may not even have optimized versions of their code for the different processors, but a one-size-fits-all distribution. Power7 is probably a big step forward for them. I know application providers who still compile on Power4 hardware with a generic set of compiler switches to allow the code to run on the entire processor set.
In fact, AIX is like this. The version of AIX 5.3 that runs on the Power6 575's (the current speed freak machine) is EXACTLY THE SAME as that which runs on an RS64 44P 170 (same install disks, I know, because I have done it!). There is no distinction on FixCentral for patches. It is just all the same.
Your comments about AIX5.3 are interesting. Yes, there are some features that will not be available to AIX5.3. Things like Turbo mode. But AIX 5.3 is still supported (not sure if there is an end-of-life date yet, would expect it if and when AIX 6.2 or AIX 7.1 is available), and there is likely to be a new Technology Level (TL12?) for Power7 that will add some of the new features. IBM have always kept the latest 2 releases of AIX under active support, and normally publish withdrawal from marketing for an OS about 2 years prior to that date. This means that there is at least 2 years of AIX 5.3 support, not that I would recommend anybody installing Power7 to use AIX 5.3 at this time.
The instruction features are more likely to be conditioned by the compilers (which, incidentally, are currently OS version agnostic, the Fortran and C compilers are the same packages for AIX 5.3 and AIX 6.1). What's even more impressive is that you can compile Power6 code on, say, a Power5 system, drop it onto a Power6 box, and expect it to run as well as if it had been compiled on a Power6 system.
All of this does not sound like the scenario you paint. Maybe you ought to work in a big AIX shop sometime, and see what binary compatibility is really like.
BTW. I cannot say where I am working, but we have more than one cluster in the first 100 of the November 2009 Top 500 Supercomputer list.
It's perfectly possible to lockdown sudo so that you cannot run any shell, and there are many books around that will also show how to prevent user-escapes from allowed commands (like shell escapes from vi, for example).
This is another advantage of UNIX and UNIX-like OS's. There's lots of documentation and experience 'out there'. When your only avenue to reliable knowledge is a vendors training program, you become their technical and economic hostage. This is one reason some vendors like changing their product frequently, so they have the opportunity to sell their training over-and-over again.
I'm sure I don't agree. Yes, UNIX is nearly 40. Yes, there are uglies in the way that you administer it, and also in the crude security model, but what are you holding up as a shining example of something better? I've seen administration tools that looked prettier, but they generally end up being so locked down as to be largely useless, or so complex to set up (I'm thinking CDE with it's cross-system authentication here) that you have to be a real propeller-head in order to get it working.
UNIX has seen off so many alternatives, and still lives on, while everyone else learns the hard way over-and-over again that hidden complexity leads to difficult-to-manage systems. The more layers of 'gloss' you add to 'simplify' administration, the more problems you build in when it goes wrong. (I'm coining Gathercole's Law as being "Apparent simplicity causes hidden complexity" )
If you need something better for users, then Gnome and KDE will provide you something just as pretty as other OS's (and a product from the 1980's called Looking Glass, which predates usable Windows systems also springs to mind), so the so called unfriendly* command line is not necessary for those who don't need it. Sometimes you ought to look and see what it is possible to do with the simplicity of the shell command line as practiced by real power users. It may not LOOK pretty, but it is elegant and functional.
I have frequently stunned managers and younger colleges by piping together several small tools with simple stream processors (think awk or sed) to achieve in a matter of minutes things that they were prepared to commit days of work to do. This is especially true in clusters or networks of near homogeneous systems, which is where UNIX excels.
It is a testament to the original design criteria of the shell and the base UNIX command set that most of the commands I use on a daily basis came out of Bell Labs. Version 7 UNIX, dated 1976. This has been augmented over the years, but you would still recognize that system as UNIX today. This may mark me out as a dinosaur, but hey! I'm still working, and I appear to have the respect of my peers who keep asking me to do things they cannot work out an easy way to do.
In my view, what is wrong with the example quoted WAS a UNIX design flaw, that of allowing spaces in filenames (space should have been made a banned character), but the very flexibility of the shell and filesystem interface allowing almost any character in filenames has allowed multi-byte character set languages to be integrated into UNIX with comparatively little effort.
(*) Often, the reason why it was seen as unfriendly is that most users were too lazy to learn the dozen or so commands that were the core set needed to do their job. They got frightened because two-and-three letter abbreviations were not close enough to english (e.g. cat - catinate is and English word, but one many people are not familiar with). This was a matter of perception and training. Possibly the only OS that got it right on the command line was VAX/VMS with DCL, which allowed you to use full command names, or any unique abbreviation. But this made the command processor one of the largest tasks in the system and was still not English!
P.S. I'm really not looking forward to a time when role-based security (which is already present in the few genetic UNICES left and also Linux since the 2.6 Kernel) becomes the norm. I predict that we will see stories of administrators who don't fully understand the importance of local privileged accounts locking themselves out of their systems when the LDAP or ActiveX directory servers cannot be contacted to authenticate them to fix the problem.
I've been reading Guy's work for over 30 years, since the early issues of PCW. He was one of the computing journalists who made it worth buying a magazine just because he had written an article for it.
I cannot say how much I will miss seeing his clear and concise style of writing.
I especially remember his reviews of the original Acorn Archimedes in Byte, where he was able to do a quality job of reviewing a world-class product in a US publication. This is one of the few issues of Byte that I have kept in my keepsakes collection, and it will become all the more treasured as a result.
My condolences to Lucy, and everyone else who had the privilege of knowing him personally.
I sincerely hope...
... that this is another April Fools story.
Do you really believe that paying to post comments is actually something that the majority of commentards will actually do? It's just a bit of light relief, and the ability to see whether other people are of like mind.
Next you will be saying that BOFH will be only available to subscription holders.
Hang on. This over 250 words yet is it?
I know the term is used in a broad sense, but I would suggest that viviculture (animal farming) is actually contributing to greenhouse gasses. In it's strictest sense, agriculture is farming of plants, which I would guess is actually is a net CO2 consumer, and only produces methane if something goes wrong.
Mind you, without an animal sector of farming, the following would happen:
1. We would have to try to work out what to do with millions of tons of straw every year
2. Without animal fertilizer, you would have to learn to rotate crops or fortify land with artificial fertilizer (which is related to oil as it requires energy and some oil by-products), or suffer a large drop in productivity.
2. Upland/marginal/river margin land would become unproductive (a sheep can graze on land you cannot get a tractor on).
3. You would have to learn to live without other foods, not just burgers. Think milk, cheese, yogurt, cream, bacon etc..
4. If you include Chickens (major methane producer) in the mix, you also loose eggs, and the cheapest and most widely eaten protein source
5. There would be a serious protein shortage, which would require serious management of the populations diet in the West.
6. The countryside becomes huge expanses of either fallow scrubland (uneconomical to grow crops on), or vast belts of arable monoculture.
7. Nature abhors a vacuum. Natural animal life (admittedly a lower greenhouse gas producer) will move in where the farmed animals used to be.
8. And finally, if the human population were to move on to a pulse and/or brassica based diet (think brussel sprouts or cabbage for the latter), then WE would probably become the largest producer of methane (at least in my experience!)
Type 12 (improved)
This was Leander. It was built on the basic hull form and machinery of the Type 12 Whitby and Rothsay frigates, which were specialist AS and AA frigates.
Interestingly, the last batch Leanders ('broad-beam') were actually completed with different specialist configurations (Ikara AS, or Sea Wolf AA, and I believe that some had Exocet) in place of the Twin 4.5" turret, and many older vessels were converted during their lifetime.
So we went from specialist to general, then back to specialist.
After this, the Navy wobbled a bit. The Type 21 (Amazon) which was a commercial design, which was regarded as a poor as a result of not having sufficient upgrade potential built in, but then the Type 22 Weapon or Broadsword, which was a Navy design, and the later 'stretched' versions were so successful that some remain in service today. As I understood it, the extra space was not for additional weapons, but for Command and Control capabilities to allow these vessels additional radar and tactical control facilities to allow a conflict to be run from on-board.
Looking back, it seems strange now to consider that the Leander class ran to 26 ships. Nowadays, the entire major surface fleet is not much larger.
And the other thing to note is that today's destroyers are the size of 2nd WW cruisers, the frigates are the size of flotilla leader destroyers. There are effectively no vessels in the small frigate/corvette category, as these do not have full ocean-going capabilities without sacrificing either speed or weapons for endurance.
In reply to everybody saying that the modern warships are armored, that is not really the case. Whilst they do have survivability design features, a single missile or largish bomb will actually take a frigate out, and they would suffer quite badly from shrapnel damage from a near miss. What they do have is the ability to operate in nuclear or bacterial contaminated fields of war (so called ABC, Atomic, Bacterial or Chemical), and the Type 45 destroyer is intended to be a 'stealth' ship, with surfaces and water sprays designed to scatter radar, to make it look smaller on radar than it actually is. Imagine how large a container ship, with large flat sides must look.
These features are most comically illustrated by the so-called Kryten turret (Mk. 8 improved), which looks, naturally, like Kryten's (from Red Dwarf) head.
In addition, a warship must be able to move at least as fast as the rest of the group it is with (and with allied Navies), and to be able to react rapidly (which is why they switched from oil fuel steam turbines that had a startup time measured in hours, to Gas Turbine and/or Diesel, to allow a ship to be underway in a matter of minutes). Keeping j-fuel safe in combat is MUCH more difficult than keeping heavy oil fuel, which requires more design work.
And Lewis's ill-informed musing about carriers being able to protect themselves does not take into account amphibious warefare vessels like HMS Ocean, which do not have all the trappings of a full carrier.
Putting it bluntly, frigate sized ships are much more cost effective and useful in any number of different, and possibly un-expected environments than helicopter-carrying RFA's.
So Lewis. 3/10, could do better.
but are you seriously saying that you either only know people who do not have cars, or ones so rich they opt for every gadget! Every car has had a radio fitted as standard for several decades.
I'm sure that even if you have the most expensive media player in the world in your car, that there is probably an analogue radio hidden in it somewhere. After all, a single chip radio adds almost nothing to the cost of a device, so why would they not throw one in!
Ditto radio alarm clocks and portable media players. Do you not know anybody with a latest gen. iPod Nano or a recent Nokia phone.
I suspect that when asked whether they have an analogue radio, most of your friends say "dunno, I've never looked".
You don't have to care, but I do.
Sounds like your mate is also in line for paying TomTom or someone else for traffic updates which can be got for free from local radio.
There's more reason to listen to radio than to drown out the engine noise!
One wonders when they intend to count digital radio on Freeview boxes in the future. Would enable them to easily meet their targets!
BTW, if you are a not a radio listener, WTF are you doing commenting, or even reading the article. You self admit that you are not an interested party, go somewhere else to rant!
...do I listen to analogue radio, I even listen to it on my pocket DAB receiver. I get about 3-4 hours of DAB or 30+ hours of analogue out of a pair of AA's.
If my local commercial FM station had not just fallen foul of the receivers last week, I would even claim that not having local radio on DAB was a reason to stay analogue.
Reception is a poor comparison as DAB reception is pretty poor for people who live more than 5 miles outside of a town regardless of what you listen to it on.
And the NHS...
...is just sooooo god at identifying people allowed treatment that they can be trusted to confirm identity!
I've seen my GP once in 10 years. I'm sure that he would recognize me again. Oh yes.
That would either be the DVLA Local Offices (all 39 of them, all in big cities, see http://www.dft.gov.uk/dvla/contactus/localoffices/findnear.aspx), or the Post Office. Just looking at the US, California on it's own has more DMV offices that the UK has DVLA Local Offices.
We do most of our driving license work by post, the Internet or in the Post Office. And unlike you, our license lasts from when we pass our test to 70. Identity is confirmed by having an influential person (doctor, MP, business owner) vouching for the identity only once when the provisional license is first issued. I believe that there is a requirement to apply for a new photo card every 10 years, but that is done just by sending a new photograph by post.
Even the old-style passport (the non-biometric ones) were done the same way. This is why it is such an outrage (to us) that the new passport or ID card requires visiting such a centre.
Having mentioned California, it's obvious why I've used the Terminator icon!
... forfeit their membership?
Why do they need to , bearing in mind how much the rest of the world now relies on them as the worlds manufacturer.
If China withdrew from the WTO, who exactly would boycott trade with them? It's a fine idea as long as you don't want computers, TV's, other electronic devices, plasticware, knives and forks, kids toys, tee shirts and jeans... and even a place to send all your plastic waste to be re-used rather than dumped in landfill.
I could go on.
Next time you buy something non-food, pretty much anything, have a look at where it was made. Just think how you would like to wait a year to get non-Chinese production scaled up, and how you would embrace paying three times as much for it. And that's not to mention the billions of dollars that China has invested from it's sovereign wealth fund propping up UK and US companies.
No, China is not afraid of the WTO. We should be afraid of them leveraging their dominant manufacturing position on us. Still, we only have ourselves to blame for letting our manufacturing sector to become so niche.
I don't like the human rights issues either, but if you examine the United Nations Charter, you will find that not even this allows any country to interfere with another sovereign nation (Article 2, Paragraph 7 apparently). Mind you, this appears to be something that the US and UK governments have forgotten over the years.
The other concern I have is why so many people think that the western democratic system is the only one worth merit? It should be quite obvious from Afghanistan and Iraq that it does not fit the whole world's moral and ethical systems. We (in the west) are just being moral snobs. I don't think that the Chinese system is currently fair, but that does not mean that we immediately have to schedule a western style election for China. The Chinese representational system, if it were implemented correctly could work, as long as the people at the top loose their desire to stay in power (hmmmm, probably not going to happen).
Anyway, enough of this Friday Afternoon politics, I need a pint!
Malcolm Corbett has *nothing* to do with the announcement of the phone tax, so his comments about fibre to the home are just that. Comment on the main story by an interested party. While he makes good points about providing real competition for the 'last-mile' (or five) to BT, he is really completely detached from the real world. We really cannot afford a complete new infrastructure for the countryside.
What many people commenting here do not understand is that it is not just people living in the middle of Dartmoor who cannot get broadband, but people who live 5 miles out from a town with a local telephone exchange. Where I live in Somerset, I get ~7Mb/S, but I live about 0.75 from the exchange, as-the-crow-flies. But if you live a couple of miles out of my small town (population of around 10,000), you are lucky to get 1Mb/S, and if you are unfortunate enough to have significant runs of copper-on-a-pole (or worse, aluminium), then you are likely to get zilch, nada, nothing. We're not talking about wilderness, we're talking small towns and villages with green space between them that do not need an exchange to provide phone services.
It is too easy to complain that people should not have moved to the country, there are many, many people for whom it has been their whole life, not a lifestyle choice. Why should they make a 'lifestyle choice' just to get *ANY* internet access.
What I think that the bill aims to provide is a basic 2Mb/S service to 95% of the population. This hardly counts as a "super-fast" broadband service, and the comments about 50Mb/S for farmer Giles who just looks at sheep-porn just show how fnorking blinkered and uneducated some of you cnuts are.
Technology limitations and cost is what is preventing universal fast net access (how I hate it when 'broadband' is used inappropriately).
What should be the aim is single fibre bundle to a roadside box in the middle of a village, with copper to the house, possibly combined with the phone system to provide a DSL type connection. But even this is a major upheaval when you currently have separate metal wires from each dwelling to the nearest exchange. Whilst I abhor additional taxation, providing some financial support for rural *communities* is almost certainly a Good Thing(tm)
Reading through the BS that some people are spouting makes my blood boil. I'm off for a beer to cool down!
There was a color (sic) version of the Apple ][, but the original was black-and-white (actually black-and-green, as Apple only sold a green monitor). I never saw one actually with a coloUr monitor (damn the Yanks and their spelling), but I did use one with a monochrome monitor. It was a PAL model so it could have been that the colour was provided by a third party board, replacing the Apple PAL card.
At the time that the C64 was selling, Apple had moved on to the Apple ][e and the Apple ][c, which were enhanced and compact versions.
I preferred the Beeb myself. Just could not see the attraction of the C64's poor Basic, slower processor, minimal expansion, expensive (and slow!) floppy drives, and lack of bank-switched ROM that allowed you to switch applications on a whim. The (one) hardware sprite, and a more flexible sound hardware did make a difference, but the extensive software interrupt driven sound system on the BBC allowed similar effects to be created, albeit with a greater effort from the programmer.
The C64 was a better system than the Spectrum, though, but that should not detract from the design genius that produced the speccy at the price it sold at.
That the iPhone bears a passing resemblance to a Palm T5 or TX. If only Palm had put a Treo phone chipset in to that, rather than jumping onto the Handspring model for Palms-with-phone, then we might be saying something completely different.
My treo 650 is still soldiering on after 4 1/2 years, but it obviously isn't as sexy as an iPhone, Android or a Pre.
BTW, I know it does not have WiFi or built-in GPS (my GPS unit connects by Bluetooth), but I charge it on the way home on a Friday in the car, use it all weekend for calls, games and media, and it is still over 50% full when I get back in the car on Monday morning. And I can get LOTS of applications for free from many different sites.
that I find more music that I want to listen to on Amazon MP3 downloads that I do in my local (25 mile away) HMV store.
Even the majors, and I must admit that I can only think of HMV as remaining, having lost Virgin/Zavvi, MVC, Our Price (OK, I know it was a long time ago), and Woolies, and the jumped-up News Agents like WH Smiths and the Supermarkets, only stock items that they think they will sell. Hardly any back catalog at all.
I don't choose to listed to what the Music Industry think I want to listen to.
But I do miss analogue music formats. I'd probably still buy vinyl if I could!
What technology - just guessing, but...
You need to send out information for each eye with a different polarization. I do not know for certain, but I can envisage two ways this could be done.
One is to install switchable polarization filters across the whole screen, and interleave left-and-right images while altering the polarization of the filter. This is quite simple to do (LCD screens rely on cross-polarized filters to work anyway, so probably means that instead of the single set of red-green-blue filters, you put two sets in, which allows you to have both-left showing the left image, both-right showing the right image and any combination of left and right showing nothing. It is not quite this simple, unfortunately, as you need degrees of filtering to allow you to show close to the whole range of colours. In addition, plasma TV's don't use polarizing filters, but could easily have a set added. You would also probably need an overall refresh rate of at least 100Hz to avoid perceivable flickering, and very fast acting plasma or LCD screens. On LCD screens, there may also be some left-right bleedthrough of the other image as well.
The second method is to double either the horizontal or vertical resolution (if you want to maintain the same resolution), and have alternate columns or rows behind fixed polarizing filters of different direction. You then feed the left image into the even columns or rows, and the right image into the odd columns or rows. This would work for both LCD and Plasma, and if done cleverly with LCD panels at little extra cost for the screen. You do not need to increase the refresh rate.
In both cases OLED screens would work like plasma screens.
If I were deciding on which system to use, I believe that I would opt for the second design, because I think it would be less complex to build (especially if you accept halved resolution as you could just modify the build process for existing panels), and probably cheaper.
... the nitrogen dioxide that will also be a product if the atmosphere is used as the source of the oxygen. Of course, this is produced in petrol engines as well, but most people forget it when considering hydrogen as fuel in a conventional piston engine.
Collaborative Distributed Proxy
I have long thought that an Open Source, Collaborative Distributed Proxy (my term, and I don't think it has been used elsewhere), whereby any packet can be sent via any member of the collective, in a pseudo-random scatter basis, with encryption, is needed to defeat the country filters imposed by a number of countries.
I've not worked out all of the details, but the basis is that you run a client that acts as a html proxy on your on system, which joins the collective, and does not route any two packets the same way, using UDP stateless connections on randomized ports via other members of the collective. You would need to be able to re-assemble the packet stream, and enforce packet re-transmission (like TCP), and you would need a fixed endpoint for each TCP session.
I know that TOR does something similar, but is mainly for anonymity, I believe that my solution differs because the set of system participating would be constantly shifting, making it difficult to block at the country level.
There are problems with local firewalls on each of the member machines which I have not yet worked out (I suspect that at some point, you would need a broker), and initially joining the collective would be a potential point of weakness which could be trapped, but I think that these are all addressable.
This years camp finished four weeks ago. Does it take that long for the post to get a card from NZ?
My thoughts are that Simon could not get the leave, or get the Boss to allow him the time to attend, so he faked his own death.
My guess is that when they get round to interviewing for his replacement, there will strangely be only one applicant, who will turn out to be Simon's 'long lost twin brother', separated at birth and sent to Australia (or possibly New Zealand).
Alternatively, Sleep No More may be referring to a Greg Iles story dealing with Transmigration of the soul. Maybe Simon is coming back in another body! Or possibly has had plastic surgery, and he will just appear to be someone else.
I can't wait!
But you're talking 30 year old kit!
VT52s are ANCIENT. DEC switched to selling VT100s back in the late 70's, so any VT52s would be 30+ years old. The video components alone would probably be dangerous to power up. I'm sure that all of the capacitors would have leaked by now.
Mind you, they were easy to code for compared to the other things that were out there then. I actually wrote a full VT52 emulator in BBC basic that could keep up with 9600 baud. I then recoded it in 6502 assembler in a day. Could not be arsed to write the VT100 emulator that I really needed.
Bearing in mind the dodgy photo's that Wikipedia has, if the PFY had one in good nick, he could probably find a buyer, if only to take some good pictures to immortalize this important terminal.
Cost, adaptability to hydrogen (it's just a modified LPG injection unit), commodity training for the engineers, durability, ease of parts supply, fuel economy, advanced engineering leading to high power-to-weight (financed by the Motor trade not Boeing), no special secrets to be gleaned when they are shot down, ability to be maintained in your average motor garage with readily available tools when operating close to the front line.
I could probably go on...
Broadband over power cables?
There have been trials of data-over-power grid (please note this is *NOT* the same as Homeplug). Scottish Power actually had a commercial service at one time, I believe.
It's not RF interference that killed the trials of this, it was the cost of bridging the signal from high to medium to low tension safely, the problem of combining upstream signals, and the problem of suppressing power switching noise which would cause damage of the datastream ( I was told that even medium tension switching uses sealed oil-quenched switches that arc through the oil, causing it to boil and be very dangerous - exploding substations anybody?). Not conducive to data.
My local electricity distribution company has fibre carried on its HT pylons, providing long-haul data services for trunks across the Atlantic, and has been selling bandwidth on this for over 10 years. But this is not suitable for broadband to the home, unfortunately.
I would have thought that the extra stress from fibre blowing in the wind would introduce stress fractures over time, even if there was some form of support cable with it.
It is allowable to bend fibre, but there is a minimum radius for any bend dictated by the angles of reflection and refraction for the type of fibre used and the frequency of the light (can't quite remember my O level Physics). Even on a straight piece of fibre, the light does not travel straight down, it bounces from side-to-side, zigzagging down the fibre. If a bend is too severe, instead of reflecting back into the fibre, some of it is refracted out of it, causing a loss of signal. If the bend is really severe, all the light leaves the fibre leading to total signal loss. And a crack or fracture will probably have the same effect.
Rather than single point suspension, I expect to see curved supports, so the overall shape will be a wavy line (~~~) rather than a series of connected 'U's or W's (WW)
No win situation
There is no way the BBC can escape criticism in this argument, and this is not because of what they do, but because of their wide audience of people with different viewing needs and opinions.
The fact that there is such a spirited set of arguments just proves that the BBC is being inclusive, and is probably doing it well. There is no way that everybody can agree on a single set of programming, and even if they did, it would then be criticized for being non-imaginative middle-of-the-road crap. It is the ONLY broad-spectrum media organization in the UK, and is probably the best in the world.
I do not particularly like period costume drama, but I accept that there are people who do. I do not like sport either, but I am not calling for either of these to be taken off. Same with Soaps. I do like much of the BBC 3 output, it allows programs that would not be carried anywhere else to be made, but it does get a bit repetitive (that's why it is actually so cheap). BBC 4 is useful for its arts and historical documentaries, and especially for its Proms coverage.
If there is anything on air that needs reviewing, it is the output from the biggest critic of the BBC, that being BSkyB. Just try to spot what they actually commission, rather than buying in.
Brainiacs, sport coverage, a handful of popularist book dramatizations, some elimination entertainment shows (following the herd) and a whole raft of police or customs reality shows and out-take shows. Are they really a good yardstick to compare the BBC to?
Everything else is American big-budget shows (some of which I quite like) and Matt Groening cartoons, but nothing they have actually MADE. Even though Sky carry a huge number of channels, they actually produce almost nothing of value themselves (Hogfather and The Colour of Magic excepted - but these were very rare).
If you need to free bandwidth up on Freeview, dump Sky 3 (just a placeholder really) and half of the shopping channels (Bid, Pricedrop, Ideal, Create and Craft, QVC - do we need them all), and some of the +1 channels. (I would also vote to return YeSTERDAY back to the UKTV History format). And definitly get rid of the Bingo and Roulette pap and Babestation exploitative junk. These last two catagories do not need replacing, just removing (really, there is much better free real-porn online if you want it).
I hope that was a joke. Have you seen the reported size of the Chinese military!
And they have a capacity to launch space vehicles, so they could probably do ICBM's just as easily.
And they have a modern airforce, and are building a potent navy.
Dyson Spheres and gravity
Gravity is not a problem. I'm fairly sure that there is a mathematical proof that there would be real gravity on the inside of the Dyson Sphere. The field strength would depend on the mass and radius of the sphere.
This is explained in the sciency bits at the end of one of Larry Niven's Ringworld books. The proof is based on an infinite sheet, and a large sphere would approximate an infinite sheet. It would be enough to hold the atmosphere close to the surface (on both sides!). Gravity would be perpendicular to the surface at all points, so the terracing would not be required, and in fact could not work if you were relying on spin for gravity (close to the poles, there would not be enough spin to generate pseudo-gravity. There would be no atmosphere at the poles unless the whole volume of the sphere was under pressure, but then the Sun would not work, nor would there be enough gasses to fill the HUGE volume of the interior of the sphere).
You would have to leak energy through the shell to maintain thermodynamic equilibrium, but the way that the energy would leak would probably mostly be in the infra-red, and would be fairly low grade and difficult to detect.
Unlike a ringworld, it would probably not be possible to steer a Dyson Sphere.
The Ringworld needed to spin because it did not approximate an infinite sheet. They also needed rim mountains to contain the atmosphere, ramjets to correct wobble, and shadow squares to approximate day and night.
I'm just wondering whether it would be worth having a Teela Brown around for company, or whether Tree of Life root would be categorized as a Class 1 drug!
Nothing to do with democracy
We have a representational democracy in the UK. If Parliament vote to accept indefinite retention, there is nothing undemocratic about this.
Unethical, immoral, non-productive, stupid and possibly illegal according to European law maybe, but undemocratic - never.
This is even the case if the policy does not match the feeling of the majority of voters. The fact that you voted your MP into office (or didn't if you either did not vote, or supported one of the loosing candidates) means that you delegated to them the authority to vote on your behalf. Only problem is that they rarely do...
If this really upsets you, lobby your MP, or vote for a party that is more sensible (if there is one!), or even if you feel strongly enough, stand for Parliament yourself!
Democracy is basically agreeing to be governed by the majority. The problem is that without a referendum on every subject, you have to trust, rightly or wrongly, someone to act on your behalf.
BTW. I hate the policy as well. If you are cleared, then my view is that the data should be deleted immediately. Maybe we ought to have a 'not proven' verdict like Scotland, which would allow DNA to be kept for a fixed period, but deleted for cleared suspects.
Pass me my slippers. It must be time for my nap
Fetchmail and the AT&T Toolbox version of mailx anyone? Folders, mime attachments and an interface that is soooo familiar. Yes, I really do use this combination, at least sometimes.
Now I REALLY know that I'm past it!
@global worming (sic)
My goodness. When I read the title, the idea of some deity or other stuffing a powder or drench down the Earths throat was really alarming (livestock joke)!
Maybe the human race are being likened to tape-worm parasites on the Earth, and Climate change is the way to kill us off!
Put it on Power
Because this architecture has single bit correction and double bit detection on all memory and all the internal system registers. And there are additional checks on the results of any machine operation (I'm led to believe that there are effectively tilt bits on the internal hardware instruction sub-units, and once more than one is tripped, it re-executes the instruction).
Should reduce the effect of power (not Power) glitches and even cosmic ray corruption to make this type of attach meaningless.
It's entropy-mental, my dear Watson
This problem is almost certainly to do with the entropy gathering in the random number generator of the system being cracked. It is normal to stir in entropy data gathered from the hardware (like minor variations in temperature, or bus noise, or maybe small power fluctuations) to the random number seed process to avoid deterministic sequences of random numbers. If you can guess what a sequence of random numbers will be during key generation (SSL uses transient session keys to encrypt parts of the rest of the key exchange and checking process), then the value of the key is severely reduced.
Exactly how this entropy data is gathered is normally specific to the OS and device, so I suspect that the same technique would have to be significantly varied for each different device you want to attack. If you have a device with good isolation from external variations, then this technique will be virtually useless (although gathering entropy data becomes more difficult). And if you have a really good hardware based random number generator that has it's own entropy gathering mechanism, then this will be impossible.
Mind you, I don't fancy being around if they start using focused beams of radiation to affect systems within Data Centers.
Tinfoil hats anyone!
But how about...
... a pad that can work independently, but can be dropped into a cradle with keyboard, mouse and screens attached, which works a lot like a PC.
I think that you can already see some of this happening in netbook space. I was surprise how well my EeePC 701 worked with a normal keyboard, mouse and screen attached. Looked like a normal computer!
If this is a loitering weapon (unlike a cruise, which hits a geographically static target with high accuracy), what the hell are they using to recognize the target?
For goodness sake, we can't get facial recognition working for passports in controlled conditions in airports, so how is it going to work in a mobile platform with limited weight and power constraints, for a moving target in a poor environment?
More likely, it will need some form of marker like a radio beacon to be planted in the car or on the clothes of the target. This will still need someone to get up-close. Either this, or someone staring into a video screen in Florida or Nevada.
Even things like the current generation of guided smart bombs that can follow targets normally need a beacon or laser illumination (ever wondered why yank infantry keep pointing gun's at a target, even though there's a C130 gunship attacking it [seen clearly in the first Transformers movie, for example]).They're pointing lasers at the target, and the gunship or smart bomb homes into the reflected coherent light.
For anybody who uses a separate partition for their home directory, then it is likely that whatever changes they have already made for Hardy, Intrepid, Jaunty or Karmic will persist across the new OS (along with inappropriate settings for new versions of older software as well, unfortunately!)
I include Hardy, as I am going LTS to LTS releases on my main boxes, missing the intermediate versions.
but seriously. You just can't win. Make no changes, and you are being unambitious or not keeping up with the competition. Make changes, and it is all unnecessary. Thank god it is very easily configurable!
Missed the StrongARM(ed) reference
... which is/was the Digital Equipment Corp./Intel variants of the ARM chip (at least before Xscale replaced it, which was then sold to Marvell).
I did not see an XScale pun in the article.
But I believe that when ARM Holdings were set up to guide the development of the architecture, the chip design was re-branded as the "Advanced RISC Machine", removing the Acorn name (at least this is what Wikipedia says here - http://en.wikipedia.org/wiki/ARM_architecture)
I really miss the thinking behind Acorn machines.
re: Doing nothing
I wish that there would be a change of emphasis from "Global Warming" to "Preserving Fossil Fuels".
I'm sure that nobody would deny that the amount of fossil fuels is finite, and it is quite clear that we are depleting the available reserves. We will run out, period. There can be no real denying this. What may be argued is whether it is 50 or 500 years away.
I am generally in the skeptic camp with regard to man made global warming. I believe that man's impact, though present and undeniable, is dwarfed by what Mother Earth can do on her own. I do, however, support whole-heartedly renewable fuels, because when we've used 100 million years worth of gas, oil and coal, it's not coming back in a hurry. We are treating the Earth like a big (zinc-)carbon battery, but we can't just buy another once it is exhausted as we would an Ever-Ready(tm).
I think that we should be preserving oil at least, because it is useful as a lubricant, not just as fuel. We need to balance our energy use with what enters the Earth's domain from the Sun. This is, ultimately, where all our energy comes from in one way or another.
I'm sure that many people would agree once they consider the arguments, and I believe that Governments should switch tack to this in order to persuade the populace to change their behavior.
If this is really what was going on, then it raises the battle between IT security and the crackers to a new level. Sounds like all use of work mail addresses on social network sites should be banned forthwith, as should access to said sites and personal Webmail accounts from work PC's. Makes you think that the security police were right (and painfully obnoxious) along.
How long before saying who you work for on open sites becomes a workplace disciplinary offence!
Mind you, the presence of zero-day and un-patched known vulnerabilities in the OS and browsers does not help
Not copied, sold by IBM.
Xenon and Cell are both mainly designed (and manufactured) by IBM. Just shows you how good the IBM Chip design and foundry businesses are at attracting high volume customers. And they also provide the CPU for the Wii, although this is more like a standard PowerPC.
BTW. The Xenon is not a Cell derivative. It has modified PPE processors (3). The PPE is only part of the Cell, and the Xenon has no SPE's. Not really much of a comparison.
Check what a Bussard Ramscoop is. It projects a large magnetic field *ahead* of the ship to guide the hydrogen where it needs to go. Looking at the design of the ships, it would have to be a highly shaped field to avoid subjecting the saucer section to a possibly damaging strong magnetic field. And if the same basic design was used in the Intrepid class of ships (like NCC74656 Voyager), then it would have to be even more sophisticated, as the nacelles move (supposedly to make them more in line with the center of gravity of the ship).
As I said before, I don't believe that the design of the NCC1701 Enterprise in the original series was actually scrutinized by engineers or scientists. The function of various parts of the ship was assigned by fans, some of whom ended up writing books. I would be interested to see how many of these works are actually regarded as canon, and have made it into the production bible for the various series.
In order to retrofit one of the later codec's, they would have to compromise the backward compatibility of Theora (which is one of the sacred cows for the Theora project) , or else spend quite a lot of time merging the codec's to allow the reference Theora code to use both.
If someone (like Google themselves) were to just put the later codec into an ogg container, (which would be quite simple if the later codec is available in source form), then we could get an open 'standard' created before Theora complete their work. Thus Theora would be sidelined. This is why it would be bad for them.
Google may re-iterate the openness of Ogg Theora, and keep the later versions closed for their own use, or they may open up the latest version.
The problems that apparently prevents some people from accepting Ogg Theora are questions about the possibility of patent infringement, and the performance.
The first option may allow the question of patent infringement to be put to bed once and for all (unless the patents are challenged), but the performance issue would remain.
The second option may kill Theora off completely as an irrelevance.
Either way, it is likely to be bad news for the Theora project. This would be a real shame, as they have been working really hard to produce an acceptable open codec.
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