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* Posts by John Brookes

54 posts • joined 23 Aug 2007

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Auntie remains MYSTIFIED by that weekend BBC iPlayer and website outage

John Brookes

Don't know if it's related, but...

...iPlayer Radio now has 1mth catchup. I'm pretty sure it was 1 week before the weekend....

Both of those statements are based on the 'days left to listen' bit below each listing in the category sectionof the android app...

Can anybody with a better memory than me confirm it changed at the w/e?

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CERN data explains how Higgs heavies other matter

John Brookes

@Stretch

It is its own antiparticle - Higgs' is a real scalar field....

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NASA stitches 3.2 gigapixel 'Global Selfie' mosaic

John Brookes

Re: The location of the selfies ...

I hope I'm mistaken, but I could only find Yanks on my brief perusal. That would be even more disappointing....

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Who wants to work on a 264-Core, 6TB RAM supercomputer?

John Brookes

Re: Does that even count as a supercomputer any more?

No, I wouldn't count it as a supercomputer any more... but....

This could be major boon for a researcher at a small institution struggling to cram in sufficient simulations using a threaded/OpenMP'd application on a workstation, or a miniscule amount of CPU time on the department's/intitution's resource..... Or a researcher whose papers stand a high chance of rejection due to their sims' low resolution (or other over-simplification of the system under study).... Or the researcher whose research is at an impasse because there's just not enough RAM to contain his/her system at all..... Or where IO requirements are so overwhelming that having (N<6)TB of RAM disk yields 10^x speedups.... or, or, or....

Sure, it's a publicity stunt, but it could be an invaluable one for a number of poor schmoes on the coalface of science....

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Rise of the Machines: Robot challenges top German player at ping-pong

John Brookes

Re: Brains beat brawls

> The only devices I tolerate this from are for children - there is has a function, and they have an off switch.

My children have been gifted toys that appear to have an on/off switch, but on closer inspection that switch is revealed to be an on/demo switch.

'Demo mode' *can* mean, "I am going to bleep constantly until it's time for you to spend more of your hard-earned on batteries." That makes it an 'on/even more on' switch...

That is clearly evil, but not as evil as when it's 'On mode' that signifies 'incessant' and 'Demo mode' means the device randomly - or, through use of sensors, pseudo-randomly - makes its irritating array of noises. Annoying during the day, eerie through the night and (in the case of a toy police car I *told* the Mrs not to pack) utterly terrifying when driving through the backwoods on a country road in the pitch black.

They get binned as soon as the sprogs fail to notice when it's been locked in the outhouse for two days. Can't do the usual charity shop donation in good conscience....

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Two white dwarfs and superdense star. Yup, IDEAL for gravity lab in the sky - boffins

John Brookes

Re: bias?

Correction: pulsar, not quasar.

Otherwise, agreed

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MY EYES! Earth engulfed by BRIGHTEST EVER killer gamma-ray burst

John Brookes

Re: In Leo?

Nope, correct wording.

Constellations' size is measured in steradians. Distance is irrelevant - if it's in the same part of the sky, it's in the constellation....

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Alarming tales: What goes on INSIDE Reg hack's hi-tech bedroom

John Brookes

Re: Got the same problem in reverse

The way my boys are growing, yet utterly failing to modify their (admittedly 100% effective) parent-waking procedure, the cracking of ribs will soon provide the soundtrack to my antemeridian stirrings.

So tired, so sore...

;-)

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'Please, steal my phone' TV ads by T-Mobile US slammed by legal eagles

John Brookes

This sort of happened to me......

...in Bristol, many moons ago (2001?).

I was walking through the Bearpit, when a huge guy on a (comparatively) tiny BMX came up and demanded my phone. I sighed, he put his hand in his coat pocket threateningly, I explained that I wasn't going to give him any problems, it was just a PITA.

"Actually," I continued, "do you mind if I just pull the SIM - that's not what you're after and it's got all my numbers on it..." He acquiesced, so I pulled the phone out and began the process.

"Hang on, mate... What's that?" "An Ericsson T39", I replied. "Oh, you're alright then...." he tutted and began to cycle off.

I was indignant - for it's day, it was a seriously nice bit of kit. I didn't chase after him, but I did enquire as to why he didn't want it. "Only after Nokias, geez; can't get the chargers for those..." he answered over his shoulder as he rode off.

Saved by a proprietary charger, hoorah! :-)

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Students outraged: Computer refuses to do any work for entire week

John Brookes
Stop

Re: The real problem is...

Well done for carrying on the maths, even after it became obvious your base figure is nonsense. 150,000 students per Uni..... 187 Unis..... 28 million Uni students?

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Google slides its soft finger-fondling into any willing Android doodad

John Brookes
Thumb Up

Re: Will have to give this a try,

Agreed on all counts. I use Hacker's for everything, but (on my phone) more because of the failings of the built-in. Will definitely be giving this one a crack....

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Astronomers find biggest black hole, 17 BILLION times the size of Sun

John Brookes

Re: The bloody egg

Firstly, no, that's not what it refers to in the minds of the majority of people.

Secondly - if it did - then it's still the egg, unless you're arguing that the modern chicken is the ur-bird from which all other birds are descended.....

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Supersymmetry takes an arrow to the knee

John Brookes
Stop

Re: labor prices in different countries

Ah yes, I see exactly what point you are making and why....

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Swiss boffins slap together homegrown zBox4 supercomputer

John Brookes

48 racks of space for storage?!

48U of rack space, maybe.....

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New guide: Bake your own Raspberry Pi Lego-crust cluster

John Brookes
Stop

Think you're a little confused....

the 72TFl/s machine is the Iridis supercomputer at Southampton Uni, not the pi cluster. 72 is well in top500 range and _definitely_ a supercomputer.

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Beck's open-source challenge to freetards: play it yourself!

John Brookes
Trollface

Re: Piracy??

Possibly, but at least that puts him one up on Bob Dylan in the self-awareness stakes..... ;-D

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IT support bod? Whatever you earn, it's not enough

John Brookes

Re: Too true

It isn't.

I know doctors, lawyers, builders, etc. and they all report the same.

Working in a certain profession means that you *will* (or, at least, *should*) know more than the general milieu about the subject. The problem is that most people (in whatever profession, or none) underestimate the diversity and complexity of other people's professions. People ask eg criminal lawyers for advice about their ongoing dispute with their neighbour over property boundaries (it happened to a friend: he told him to punch his neighbour in the face. "How will that help?" "It won't, but then I'll be able to tell you how you stand legally.")

There's even a joke about it:

A doctor and a lawyer are at a party. The doctor asks the lawyer, "People are always bothering me with questions about their health; should I bill them?"

"Absolutely!" replies the lawyer, "They're asking you for services, based on years of training and your standing as a medical professional. Of course they should be prepared to pay for your insight!"

Two days later, the doctor received an invoice from the lawyer.

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Microsoft posts first-ever quarterly loss

John Brookes

Re: the dinosaur is staggering

I'm more than happy to slate MS for a lot of things, but it's more than a little harsh - not to mention wildly inaccurate - to say Redmond ruined Nokia, don't you think?

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US sets up underground dark matter detector

John Brookes

Re: really?

This *is* satire, isn't it?

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John Brookes

Re: self contradictory

I can't see any particular reason for neutrino beams not being radiation, but the rest of his point still stands. I guess that if it is not considered radiation, it could only be because of its vanishingly small interaction cross-section....

Sticking the experiment in a mine is required to (hopefully) keep the SNR manageable. On the surface, you would just have a really rubbish cosmic ray air shower detector.

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Vodafone's small, controversial tax bill validated by UK.gov

John Brookes
Stop

Nonsense!

If I buy duty-free etc, then I am not liable for tax on that purchase. Voda *were* liable for £6bn, but unilaterally decided not to pay it. The tax office then just let them off for the vast majority of it.

Despite their claims that their tax bill should've been zero, they'd set aside £2.2bn to pay it, so they knew - or strongly suspected - they'd lose if it went to litigation.

I can understand the tax office being wary of a fight with Voda, given the latter's willingness and ability to fight the claim, but we didn't even ask for the £2.2bn they'd set aside.

"Give me that £60 quid you owe me!"

"Or else what?"

"Er, call it a tenner, then..."

"Oh, go on. Got change of a twenty?"

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'Scientists' seek to set world social, economic, tech policy at Rio+20

John Brookes
Stop

So basically....

....we should all convert and become Amish? No thanks - not keen on curtain beards....

Seriously, the whole "have fewer babies and you'll be better off" thing devalues anything else they say. Such a lack of awareness of the difference between correlation and causation utterly discredits their claim to be scientists.

http://xkcd.com/552/

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IBM bans Dropbox, Siri and rival cloud tech at work

John Brookes
WTF?

So they make you pay for the device....

...tell you how you may, or may not, use said device, then whinge about the cost and the security implications?

Who actually wins out of BYOD? The employee gets to buy their employer a deliberately-crippled device, the employer doesn't save any money, but does add to its count of disgruntled BOFHs, RIM circles ever closer to the drain, Apple/Samsung/HTC etc don't get any additional revenue (unless the used-for-work device becomes so crippled that the employees have to carry two phones anyway). What's it all for?

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BOFH: Dawn raid on Fort BOFH

John Brookes
Stop

Re: not...

If it's to make you look cool, get marketing or sales to pay for it. Or perhaps marketing and/or sales only care about their departmental budget, rather than the company bottom line....

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Orange 3G data network goes titsup

John Brookes

Back up in MK!

We'll have to see for how long...

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John Brookes
Unhappy

MK screwed

Orange and Orange-T-Mobile....

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Jabra Halo 2 Bluetooth headset

John Brookes
Happy

Yay - decent stereo headset!

It's been irritating me for ages that there seems to be little traction on stereo headsets. Yeah, there are a few about at any given time, but half fo them are crappy in-ear things with dangly bits (not that sort :-) And I've never seen any in mobile phone shops / general electronics shops / Tescos etc

Most phones these days have A2DP, most PMPs are, in fact, mobile phones, yet most headsets are mono... Why? I genuinely don't get it. If you have a mono headset, you have to have a pair of plugins as well, if you're going to listen to music.

It's nearly as weird as being as bothered about it as I clearly am :-D

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Global warming COULD SHRINK THE HUMAN RACE

John Brookes
Stop

Re: Re: I'm not sure about this

As a wise friend once said to me, "Just because you are sure, doesn't mean you're right"

It doesn't imply any such mass wipeout of tall people: that *would* be a nonsense. What it means is that over many generations, taller people would be less likely to reproduce, leading to a gradual reduction in the average size of members of the species. Obviously,

How might this come to pass? Well, given the self-evident tendency of surface area per unit volume to decrease with increasing volume, larger animals find it more difficult to remain cool if the temperature increases - not impossible, just more difficult.

That implies less activity for larger animals, since activity produces heat that - unless removed - might cause dehydration/heatstroke/.... Less activity implies a reduced ability to support a family than a smaller but otherwise identical animal (less foraging time, smaller hunting range, or ...). Smaller families for (genetically) larger members of a species leads to a gradual diminution of the average size of a species as a whole.

Doesn't sound too implausible to me.

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Untangling the question of antimatter mass

John Brookes

Nope

No mass (according to theory - it'd break gauge symmetry). Momentum, yes (hence radiation pressure), but no mass.

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John Brookes

What's hasn't been done....

Is a beam of a matter/anti-matter bound state, which is what they're doing here. Badly-worded sentence, but the distinction is made clear in the article....

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John Brookes

Sort of....

There are three parts to this*:

1) We don't know whether gravity treats matter and anti-matter identically (eg whether they're identically affected by the Higgs field, or <insert gravitational theory here>)

2) We know that electrons and positrons have very similar masses, but not that they're identical.

3) In a direct annhililation, the tiny fractional differences in mass would be utterly swamped by uncertainties in the measurement (both experimental and fundamental). In the proposed experiment, if the lifetime (and hence beam length) of the positronium can be made sufficiently large, it may be possible to reduce the uncertainties to such an extent that the differences are measurable.

* I don't see how the proposed experiment could disentagle the effects of 1) and 2), but maybe that's why I can only call myself a physicist if I add the prefix 'failed'.

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Samsung Remote

John Brookes
Meh

5/10 on Android (dunno about iOS)

Auto-detection is _very_ hit and miss for me (despite the fact that it always has the same ip address) and the remote is for a slightly lower spec TV, so misses a couple of nice features.

The latter issue isn't so bad, but a remote is worse than useless if it may, or may not, be able to use it. You should be able to manually input an IP address, or save the configuration between sessions.

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Jimbo Wales ponders Wikipedia blackout

John Brookes
Go

I think they should turn WP off for a bit....

....just to try and make journalists remember how to research stories.

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John Brookes
Stop

I read 'meaningful' as....

not Hobson's choice, not punch-in-the-face-or-kick-in-the-swingers type choice etc... A choice between options that have real (meaningful) differences in outcome. Esp. as it wasn't given as a modifier at all, but rather as an additional, orthogonal property of the choice.

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Netlist puffs HyperCloud DDR3 memory to 32GB

John Brookes

I've got some of these running.....

And they do exactly what it says on the tin. Bulked out my memory from 192GB to 288GB and got a speed boost too.

Clever tech, well executed.

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Rock star physicist Cox: Neutrinos won't help us cheat time

John Brookes

I think I'll stick with rockstar physicists.....

...over muppets who advertise their own self-contradictory mumbo-jumbo. I've just read your articles. Yeesh

You do realise that many of the denizens of this place are scientists, engineers and other sorts of folk you can't abide?

Some standard steps in science according to the world at large:

1) Make a new observation. Check it.

2) Get other people to see if they can see it too

3) Postulate an explanation for what you've seen. Check it.

4) Get other people to see if your postulated explanation works with their related, or independent observations

5a) Try and make a prediction using your explanation that differs from prevailing explanations - see if it happens

or if 5a not possible

5b) Use your explanation and existing data to attempt to accurately post-dict real events

6) Repeat 5 until dead, retired or bored of the topic

If you fail at any point, go back to 1)

Scientific method according to Louis Savain:

1) Have a particularly vivid dream

2) Convince yourself that it is both right and obvious

3) Have a quick google to see if you can find any off-the-cuff remarks from long-dead philosophers, natural philosophers or scientists that don't entirely contradict your dream

4) Publish (NB self-editing for blatant contradictions is not only optional, but to be discouraged)

5) Slag off anyone who contradicts you

If you fail at step 2, you're not trying hard enough, if you fail at 3, just skip it.

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El Reg in SHOCK email address BLUNDER

John Brookes
FAIL

How incredibly embarrassing!

... I've been outed as a reg reader!

Bad Reg, naughty Reg - wash your mail server out with soap and water, then stand in the corner of the datacentre and think about what you've done..... FACING THE WALL!

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C and Unix pioneer Dennis Ritchie reported dead

John Brookes
Unhappy

RIP dmr, VIP

He was the last of my all-time heroes and then there were none :-(

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Google hits the boozer with own brand of beer

John Brookes
Joke

I wonder which side....

...of the creepy line they'd think they were on if - after drinking it - all the ads google sent you were for prostate exams....

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Accelerating universe expansion discovery snags Nobel Prize

John Brookes
Stop

Yup, silly you

From Nobel's will:

“The said interest shall be divided into five equal parts, which shall be apportioned as follows: /- - -/ one part to the person who shall have made the most important discovery or invention within the field of physics ...”

"... as judged by El Reg commentard TkH11", it fails to continue.....

The importance of discoveries and inventions is judged by the prize committees. That's why they exist.

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HP parks Airbus supers in containers

John Brookes

"Oi, mistah - giz firty quids...."

"...an' I'll make sure yer container's ere when youse get back...."

Just like matchday parking ;-)

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John Brookes

Not a GOOD test.....

...an easy test.

How can I say that?

1) Go to top500.org

2) go to a list - any of them

3) go to the statistics for that list

4) view the stats by interconnect/interconnect family

Basically, you can set a reasonably accurate lower bound on HPL efficiency for your particular arch/interconnect/topo pretty easily. Run it, see what you get, compare and contrast....

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John Brookes
WTF?

Deep breath, Todd, deep breath

Firstly, when HPL was designed, it wasn't pointless. It was pretty much the only portable benchmark that tested the capability of contemporary supercomputers to run an important class of problems.

Secondly, it's still not pointless, unless CPU speed has suddenly become irrelevent.

Thirdly, it's an excellent sanity check when throwing a cluster together:

- HPL efficiency a bit low? Hmm, let's run some interconnect tests

- Good check for excessive single-bit errors? Run HPL cluster-wide, as big as will fit on each system and see what gets reported.

Fourthly, EVERYONE knows the list is primarily used for business/marketing/dick-waving purposes. So? "Is vendor X's response to our RFQ any good?" "Yes, but they haven't built a machine on this scale since 2009." or "Yes, and I can see from the Top500 that they've got many machines in our sector at the scale we're looking." or.....

Fifthly, Jack Dongarra (et al) are perfectly aware that HPL isn't the be-all and end-all of benchmarking. That's why HPCC exists (and JD is the chair of its pretty stellar committee). Oh yes, and HPL is part of that improved benchmarking suite.

Sixthly, all benchmarks that aren't your application are - to a greater, or lesser degree - pointless. So let's not benchmark anything, eh?

Still, I'm sure your achievements dwarf those of Prof Dongarra....

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Stars say relativity still works

John Brookes

Alfven was an electrical engineer and (part-time) plasma physicist....

He proposed electromagnetic processes as the solution to virtually every problem he looked at.....

This partly explains why the 'physics establishment' were a little sniffy with him.

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Faster-than-light back with surprising CERN discovery

John Brookes
Pint

I think most physicists at Gran Sasso already know that....

They're comparing to the host-to-goodness, full-fat, speed-limit-o-the-universe in vacuo speed....

A better comparison would be with the apparently super-luminal velocities of the plumes of active galactic nuclei 'observed' a while back... Further (non-trivial) research showed that actually, all was right with the cosmos and it was illusory.

Hmm, I could either pull up a reference for this, or down tools and head to the pub.... Guess which is likelier

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Blade servers 101

John Brookes

Thermals

@Mikel - You're right in your area of interest, but the point of the article was that how appropriate blades are for you is application- and datacentre-specific. If you're hammering the cores and memory constantly, small deltas can mean significant spot heating, leading to throttling, leading to crappy performance - if one of 1000+ cores is throttling during a tightly-coupled parallel job, you're wasting half your machine. Which might only last half as long - or, equivalently, require twice the maintenance -because you're pushing the envelope. Datacentre (thermal) environment is therefore a crucial, expensive and non-trivial consideration.

@danolds,the cube - you're both right: water-cooled rear doors CAN do a great job, but you DO have to be damn sure that the fans can pull (at the very least) sufficient air through. If they can't, they're worse than useless due to internal recirculation.

Oh, and speaking of doors: for maximal-density, heavily-hammered blades, front doors considered silly.

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John Brookes

Double that density!

Actually you can get 32 servers in a c-class chassis - 16 2x220 blades....

Other than that, you've got the pros and cons bob-on

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Landlocked Bolivia seeks legal route to Pacific

John Brookes
Joke

Football chant

Apparently, when Chile play Bolivia at football, the Chile fans delight in singing, "Vamos A La Playa" ("Let's all go to the beach") at the Bolivians.

Harsh. Funny, but harsh

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Leicester Council's iPad can chair meetings

John Brookes
Pint

@mark149

Not necessarily. Instead of meaning:

a) They will only buy things that they are convinced will not improve performance

they might mean:

b) They will only buy things that they are not convinced will improve performance

or (and this is my personal favourite):

c) They definitely won't buy things that they are convinced will improve performance.

As you say, got to love triple negatives :-))

Anyway, it's half six

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