Author: Robert Hyatt
Date: 13:54:10 05/16/04
Go up one level in this thread
On May 16, 2004 at 15:39:18, Anthony Cozzie wrote: >On May 16, 2004 at 13:56:23, Tom Likens wrote: > >>On May 16, 2004 at 13:17:17, Anthony Cozzie wrote: >> >>>On May 16, 2004 at 11:10:01, Omid David Tabibi wrote: >>> >>>>On May 16, 2004 at 11:05:36, Anthony Cozzie wrote: >>>> >>>>>On May 16, 2004 at 10:14:07, K. Burcham wrote: >>>>> >>>>>> >>>>>>Has anyone here posted using dual 248s? >>>>>>wonder how 2 x 248 AMD compares to dual Xeon 3.2 with 1 meg cache running a 32 >>>>>>bit commercial chess program? >>>>>> >>>>>>http://www.newegg.com/app/viewProductDesc.asp?description=19-103-433&depa=0 >>>>>> >>>>>>http://www.monarchcomputer.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=M&Product_Code=120140 >>>>>> >>>>>>kburcham >>>>> >>>>>Like Mike, I have dual 246s. Opteron is a great CPU, but the 64-bit software >>>>>isn't *quite* ready, at least on linux (imo). >>>> >>>>Running 32 bit chess engines on that system, how much speedup do you see in >>>>comparison to the fastest 32 bit dual system? >>> >>>I wouldn't know. I only run 64 bit linux :) It works pretty well, but there >>>are definitely a few bugs left. I'd say in another 3 months my system will be >>>good enough for me (new nvidia drivers, a few more kernel versions). >>> >>>anthony >>> >>>>> >>>>>anthony >> >>Anthony, >> >>Are you running 64-bit SUSE or one of the Red Hat flavors? I've got an FX-51 >>that I initially loaded 32-bit SUSE on (this was before SUSE supported SATA >>drives right out of the box) and was pleasantly surprised at how fast the >>32-bit programs ran (chess engines included). When I finally installed the >>64-bit version, I was unpleasantly surprised at how *slow* the 32-bit software >>ran (including and especially the various Linux engines I test against). >> >>I got the requiste 64-bit boost when I converted Djinn over to a true 64-bit >>program but was somewhat dismayed with the 32-bit slowdown of its sparring >>partners. I *could* dual-boot into a 32-bit version of Linux for testing but >>frankly that offends my sensibilities and seems like a bit of a waste. >> >>regards, >>--tom > >Hmm, I haven't tried. I usually test against crafty, and I compiled a version >in 64-bit mode. I would have thought that 32 bit apps would run quickly because >this is essentially _hardware_ emulation, but maybe not . . . . > >anthony I don't see his problem. 32 bit code runs the same on a 32 bit or 64 bit operating system. The opteron just doesn't get to use all its "stuff" in 32 bit mode. I (and others) have done this several times and didn't see a 32 bit program run slower on a 64 bit O/S... Not sure what is going on there...
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