Author: Matthew Hull
Date: 13:15:06 09/08/03
Go up one level in this thread
On September 08, 2003 at 15:06:31, Vincent Diepeveen wrote: >On September 08, 2003 at 14:53:57, Robert Hyatt wrote: > >>On September 08, 2003 at 14:30:41, Vincent Diepeveen wrote: >> >>>On September 07, 2003 at 14:37:17, Joost Buijs wrote: >>> >>>diep is getting tested on the 248 right now by Johan de Gelas. both amd64 and >>>quad opteron. >>> >>>www.aceshardware.com >>> >>>regrettably only they want to test 32 bits mode... ...but well diep is NUMA. I >>>have shipped a NUMA version of diep to them that can go up to 4 cpu's. So that's >>>interesting to see how it does. Johan is very good in testing. also he does not >>>cheat. >>> >>>some other sites that tested diep in the past cheated. when the production >>>version of those machines was released and i tested with same executable, it >>>appeared that intel had cheated by 5% in speed. >>> >>>Also the speedup from SMT they had with diep was higher than when some others >>>who had purchased dual Xeons, could not get to. >>> >>>www.aceshardware.com doesn't do that. Johan is a very objective testers. >>> >>>His main intention is to figure out how much the added branch prediction table >>>will do for DIEP. >>> >>>P3 has 512 entries BTB (branch target buffer) >>>K7 has 2048 entries BPT (branch prediction table) >>>opteron/amd64 has 16384. >>> >>>Intel runs behind for complex software. >> >>That is irrelevant (the size). The Intel BTB is _far_ better than >>that on any of the other processors you mentioned. >> >>I'll let you do the research to find out why the new Intel branch >>prediction is better. Hint: It detects patterns and predicts based >>on the pattern of past taken/not-taken cases. It's clever. >> >>If bigger were always better, 2M of direct-mapped cache would be better >>than 512K of 16-way set associative. It isn't. >> >>Quality still counts... > >You are wrong in one respect. You underestimate how advanced the AMD prediction >works. > >The K7 branch prediction of 2048 entries was using the alpha 21264 way of >predicting. > >That is *very* advanced. > >For complex software when both are very advanced, more is better of course. > >First of all branch prediction of opteron works better. Secondly it's like 16384 >entries. I forgot how big the P4's is. Probably also quite bigger than the poor >512 entries they have put in the P3. > >But still Opteron outguns everything at *all* fronts > - 64 bits, p4 and k7 are all 32 bits cpu's > - 16 GPR registers, only cpu's like itanium from $8000 a piece have more POWER4+. Macs have POWER4 based chips that don't cost that much, plus a Vector processor. > - highest clocked RISC cpu > - bigger branch prediction table than any cpu i know > - BIGGER LEVEL 1 CACHE, even than itanium which has a poor 32KB. > - shorter stage than P4, so smaller branch mispredicton penalty > - capable of getting a high IPC and even at floating point it can > effectively retire 1 multiplication a clock (without cheating). > >And very important: you can buy it NOW. Buy a Mac now too. Buy a POWER4+ workstation NOW too. MH > >> >>> >>>Best regards, >>>Vincent >>> >>> >>>>On September 07, 2003 at 11:43:26, Michael P. Nance Sr. wrote: >>>> >>>>>On September 07, 2003 at 11:31:30, Gian-Carlo Pascutto wrote: >>>>> >>>>>>On September 07, 2003 at 10:54:47, Michael P. Nance Sr. wrote: >>>>>> >>>>>>>If I may,how can I get that version of WS 2003 (64 bit) so I can run Deep Sjeng >>>>>>>on My dual (246) Operton also? I'm at a Crossroads now, on what OS to use with >>>>>>>My Operton. I want to be able to go 64 bit.I wouldn't be able to accomplish >that with Windows XP Pro. Please fill in the gaps for Me.>>>>Mike >>>>>> >>>>>>You cannot get it. According to other posters here, there's a beta, but >>>>>>I don't think it is available to members of the general public. >>>>>> >>>>>>The only way to run 64 bit programs on the Opteron right now is to >>>>>>use Linux. >>>>>> >>>>>>-- >>>>>>GCP >>>>> >>>>>When might a commerical version of WS 2003(64 bit) be available to be purchased >>>>>by Us Peons? I don't suppose that there is some kind of a restriction on using >>>>>Linus with My Opteron or is that a dead Horse also? If so,what would be the cost >>>>>compairson comparired to WS 2003,would It work?>>>>Mike >>>> >>>>It will take a few months before a 64 bit AMD version of windows will hit the >>>>streets. There seems to be a beta version of windows XP for AMD-64 to. >>>>GamePC already did a preview. >>>>http://www.gamepc.com/labs/view_content.asp?id=amd64xp&page=1 >>>>Probably it is worth while to wait somewhat longer, AMD will release the 2200 >>>>MHz. 248 Opteron very soon according to the inquirer. >>>>http://www.theinquirer.net/?article=11371 >>>>This will be a real beast!
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