Author: Robert Hyatt
Date: 08:04:27 11/20/02
Go up one level in this thread
On November 20, 2002 at 02:11:03, Anthony Cozzie wrote: >On November 19, 2002 at 16:48:55, Robert Hyatt wrote: > >>On November 19, 2002 at 16:36:23, Gian-Carlo Pascutto wrote: >> >>>On November 19, 2002 at 16:34:46, Russell Reagan wrote: >>> >>>>On November 19, 2002 at 16:18:01, Gian-Carlo Pascutto wrote: >>>> >>>>>I don't think there's any way to prove that they are. >>>>> >>>>>I don't think it's a good idea to spew nonsense arguments >>>>>in a fruitless attempt to convince someone who has another >>>>>opinion. >>>> >>>>So in other words, you have just been a troll today. >>> >>>No, I've been specifically attacking people making unjustified >>>claims they can never support with sound argumentation. >>> >>>-- >>>GCP >> >> >>I found one bit of data. >> >>Bruce compiled ferret on a pentium pro 200, and then on a 500mhz alpha. He ran >>2.5X faster. >>I compiled Crafty on the same pentium pro 200 using the same compiler as bruce >>(MSVC) >>and then on the alpha using the same compiler again and I ran 3.5x faster. >> >>How would you explain that difference? >> >>Everything was the same for the two programs. Same compiler. Same processor. >>Same >>everything. Except that Bruce used his 0x88 or whatever at the time, while I >>was using a >>bitmap. This was in 1997, pretty early. I ran on that machine for the 1997 >>WMCCC >>event. Bruce used one of the cryo-machines at 767mhz that year... >> >>but 2.5X vs 3.5X has to come from somewhere. Luck? Or what? I'm pretty sure I >>_know_ >>the answer. That is a 40% improvement if I did my math right. Which is in line >>with what >>most knowledgable people claim a bitmap program should do since not all >>instructions need >>64 bits of data (branches, loop counters, a few others). > >/skepticism on >remember, there are many many many differences between the Alpha and the P6, not >just the fact that alpha is a 64 bit architechture. Alpha is a true RISC, >different caches, page sizes, etc. >/skepticism off OK... but both programs are compiled on the same machine using the same compiler, so both programs get exposed to the same architecture. Hence it is the _architecture_ that is making the most significant contribution to speed gains... That was my point all along... A 64-bit program is _obviously_ going to gain more from moving to such a machine than a 32 bit program will gain. And I do mean _obviously_...
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