Search results

  1. M

    Can global warming effect Mars?

    Noworkia, Yes, that's right, on Earth, everything under pressure is really hot: I mean, I can't even pick up the gas canister I take hiking, it's so hot! And deep-sea divers have to wear protective heat equipment. More seriously, the equations you quote relate to *work done* on a gas: if I...
  2. M

    Europe a good model for the U.S.?

    Train: Yeah, right, well, here in Europe we just admitted Sri Lanka; Russia joined years ago, and Kazakhstan is right next to France. Perhaps you need to look at a map... The US comes in at 30 (odd you didn't talk about the top 50, eh?) while the UK falls in at no. 46, but we're not part of...
  3. M

    What "evidence" links the 4 suspects to the London bombing?

    The Mirror article someone quoted gets about as close to any reasonable "alternative" explaination that I'd go to: it also explains why the bus bomb went off later, and why one eyewitness saw that bomber looking scared and messing about with his bag. But the evidence is flimsy at best: it's a...
  4. M

    Mathematical question

    The issue here is that what do you mean by the symbols "1", "+" and "2"? Once you've defined them, a "proof" that 1+1=2 is almost completely trivial (because 2 is pretty much DEFINED to be 1+1). --Matt
  5. M

    Question: viruses (the organic kind)

    I think the confusion arises because we are putting a rather human spin on what "sucessful" means. Suppose, hypothetically, that a single mutation of a virus causes the virus to both become 100% deadly, but also allows it to become increadibly good at infecting and spreading. This is a clear...
  6. M

    BBC: What do you want President Bush to do now?

    Because we value human well-being, and believe that the American health care system could be made better so that poor Americans (or, indeed, all Americans) got better healthcare? I don't think that's hard to understand at all. Now, you can argue to the cows come home about whether an...
  7. M

    View from UK and link to BBC

    Okay, this is fine: it's a belief which I broadly agree with in some sense (i.e. fiscal conservative). However, I see little evidence that Bush is not doing exactly what Kerry said he'd do! Only Bush seems to, at present, not be balancing the book terribly well (so he can truthfully say he's...
  8. M

    View from UK and link to BBC

    There's a less than perfect county map Here!!
  9. M

    View from UK and link to BBC

    Ah! This sounds plausible: it's a pitty I don't have some better statistics. But I have read elsewhere that cities tend to vote Democrate for whatever reason. This would fit with the Mid-West results as well, I guess.
  10. M

    View from UK and link to BBC

    I was thinking about adding to the thread on "What this election means for the country and the Democratic party" but thought it would be too off topic. Firstly, look at Flash map which gives a breakdown by state, and a history, all in flash. I live in the UK, but my girlfriend is from NY, so...
  11. M

    64 bit CPU. A true technical review please

    Another point is that AMD64 is not simply a 32-bit x86 extended to 64bits. AMD also doubled the number of registers available in both x86 and SSE (2/3) modes. Theoretically, this should have a large effect on performance in a way that simply moving to 64-bits does not, in general. Of course...
  12. M

    different approach to dual processing

    This is the problem: there isn't a SSE2 sine function! There is an x87 sine function, and modern compilers (e.g. Intel's or the next version of GCC) inline it, and so never call the math library (doing this trick manually with some macros with exp() and pow() increases massively the speed of a...
  13. M

    different approach to dual processing

    Following on from this (though everyone else seems to have lost interest), I'm now even more confused. A google search seems to bring up the following information (it's summed up at XBitLabs message board) It appears that the *hardware* at present does support x87 under all 64-bit modes...
  14. M

    How pathetic is NATO anyway?

    I think that Sandorski is alluding to the fact that the US doesn't have troops in the Balkans at present. I cannot confirm this, but they are certainly out of Bosnia: Wiki (scroll down, where you'll see that an EU peace-keeping force is currently in place). Cheers, --Matt
  15. M

    different approach to dual processing

    soa123: Weird! I'm reading the "AMD64 Architecture Programmer's Manual Vol 1" To quote some things: In a section labelled "advantages of x87", we have Which was the point I was making. I'd be very surprised if x87 was ever turned off, as then a lot of scientific code couldn't be run. In...
  16. M

    different approach to dual processing

    I am pretty sure that this is false. If you read the AMD tech docs, then it's unclear, but I interpretted them to mean that x87 usage is discouraged but not actually turned off. You could interpret the CPU-Z article the same was as well. The reason I believe this is that SSE/SEE-2 etc. are...
  17. M

    How would Jesus vote?

    Does anyone have a subscription to The Economist? A friend of mine does, and sent me a link to this article Belief and the Ballot Box which by-passed the login screen I get. Anyway, if someone has, it's an interesting article in relation to this thread: in particular, to the statement: To...
  18. M

    different approach to dual processing

    I'm not sure it is *that* bad at emulation. A brief google search does not yield anything other than rather old articles. Still, I am willing to believe that pentium running at the same frequency as the itanium itself would probably be better than the itanium in x86 mode. This assumes...
  19. M

    different approach to dual processing

    I think the answers are "marketing" and the difference between 8/16-bit processors and 8/16-bit data sizes. Intel certainly could tack a pentium (or whatever) core onto the Itanium. However, I believe that the whole point of having x86 compatability at all is to give good performance with...
  20. M

    In the far future, will it be likely for PC's to have a Terahertz worth of speed?

    Off topic slightly: In relation to prime95, it's not that the code isn't multi-threaded, but that it cannot be multi-threaded. The way prime95 works is to perform a squaring operation on a really vast number a whole load of times. Each operations takes 1/100 of a second or more to perform, and...
  21. M

    In the far future, will it be likely for PC's to have a Terahertz worth of speed?

    I'm with Cogman: it might be possible, but I doubt it will happen. Think about it: what does your current 3GHz+ CPU actually do which requires that much speed? Rephrasing in a more interesting way: What does your current 3GHz+ CPU actually do which requires that much speed, but that three 1GHz...
  22. M

    Math Question...(Epsilon-Delta definition of a limit)

    Yep, seems to be the right idea. My way was as follows. Given E>0 we want to find D>0 so that if |z+i|<D then |1/z-i| < E. Now, |1/z-i| = |z-iz|/|z| = |z+i|/|z|. The idea is that if z is close to -i then z cannot be close to 0, so that |z| is large. We can prove this by doing something a...
  23. M

    Math Question...(Epsilon-Delta definition of a limit)

    ELiu, Right, well, your proof that z^2->-1 as z->-i seems correct, if not 100% rigourous (sorry, I'm a bit of a maths stickler :) ). So, fix E>0. Then |1/z-i| < D/|z| and we want |1/z-i|<E. So, we basically want D/|z|<E, remembering that |z+i|<D. Suppose we can prove that 1/|z| < 2 say...
  24. M

    Math Question...(Epsilon-Delta definition of a limit)

    Well, I nearly have a PHD in Analysis, so I should be able to help I guess... You want, for E>0, to find D>0 so that |z+i|<D means |1/z-i|<E. So, you have |1/z-i| = |1-iz|/|z| = |z+i|/|z| < D/|z| but as you say, how to get rid of the |z| term? Well, I think a good hint might be the...
  25. M

    How much processor time is wasted doing OS stuff

    I would agree: for your 60 second MP3 encoding, maybe you could get it down to 59 seconds, but not much less. On the linux box I'm on, the OS seems to take less than 1% of the CPU time, as reported by top. However, glugglug makes a good point that multi-tasking OSes do, I don't know...
  26. M

    cpu & gpu convergence

    Hmm, I hadn't thought of that. A Doom 3 like game where everything falls and breaks and explodes in an entriely correct way. Sweet. Let me change my arguement a little (good debating tactic). I wasn't suggesting that CPUs will completely replace GPUs (the point about sampling is very well...
  27. M

    cpu & gpu convergence

    BFG10K, I have to disagree. I've just done this on my (cheap Toshiba) laptop, and am noticing very little difference (only when maximise of minimise a windows really - dragging a window around the screen is surprisingly fast). This could well be because the Intel graphics my laptop uses is...
  28. M

    cpu & gpu convergence

    I like the comments mbhame made. I guess what Tim Sweeney is saying that, one the hardware level, in the coming years CPUs and GPUs are going to start looking much the same. I don't think he is saying that they will start to be used for the same functions, or in the extreme case that we'll get...
  29. M

    modulo converting

    Well, you could just convert to decimal and then convert back. I take it by "modulo" you mean "base", as it's quite a different thing! For example, 255 in base 9 is 5+5*9+2*9*9 = 212 in decimal = 125 + 3*25 + 2*5 + 2 = 1322 base 5 I take it that you know the algorithms for converting to and...
  30. M

    Quick question about pipelines

    It's not just branches which cause a problem, but also pipeline stalls. These occur when an instruction in the pipeline needs the result of an instruction further up the pipeline which hasn't finished yet. Think about multiplying two numbers and adding a third: you need the result of the...
  31. M

    x87 beyond 80-bit precision in AMD64?

    andreasl, This is not really true. If you check out AMD64 Developer Resources and grab the "AMD64 Architecture Programmers' Manuals" then you'll see that x87 is fully supported in AMD64 64-bit mode. However, it is recommended that SSE2 be used for speed, as it supports 16 flat registers (vs...
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