Date: Tue, 21 Sep 1999 17:54:48 +0000 (GMT) From: Adam Strohl <adams@digitalspark.net> To: Mats Lofkvist <mal@algonet.se> Cc: somsky@annwn.phys.washington.edu, freebsd-smp@FreeBSD.ORG Subject: Re: Examples of FreeBSD SMP success? Message-ID: <Pine.BSF.4.10.9909211752180.396-100000@nightfall.digitalspark.net> In-Reply-To: <199909211925.VAA29450@kairos.algonet.se>
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I have dual Celeron 300As clocked to 450Mhz (100Mhz x4.5), 128k of cache per CPU running at 450Mhz. It takes around 5 hours on one CPU to clear a block, and litterally the same time to do two at the same time (I tested it, I can't remeber the numbers exactly, but they were like a second off). - ----( Adam Strohl )------------------------------------------------ - - UNIX Operations/Systems http://www.digitalspark.net - - adams (at) digitalspark.net xxx.xxx.xxxx xxxxx - - ----------------------------------------( DigitalSpark.NET )------- - On Tue, 21 Sep 1999, Mats Lofkvist wrote: > Adam Strohl wrote: > > Running two copies of seti@home results in twice the number of blocks > being cleared in the same amount of time as 1. > > How large caches do you have on that machine?!? > On my kind-of-dated dual pentium pro with 256k caches a seti@home block > takes 24.6 hours on one cpu, but when running two in parallell they need > 43.9 hours each. So the speedup going from one to two processors is a > mere 12%. Easier tasks as rc5des or parallell makes achive close to factor > two speedups. > > (I'm running current, cvsupped and rebuilt august 14.) > > _ > Mats Lofkvist > mal@algonet.se > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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