Date: Tue, 14 Apr 1998 22:31:22 +0400 From: Alex Povolotsky <tarkhil@asteroid.svib.ru> To: Frank Ederveen <frank@our.domaintje.com> Cc: hackers@FreeBSD.ORG, smp@FreeBSD.ORG Subject: Re: SMP performance decrease? Message-ID: <199804141831.WAA15886@minas-tirith.pol.ru> In-Reply-To: Your message "Tue, 14 Apr 1998 16:59:40 %2B0200." <19980414165940.06093@domaintje.com>
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<19980414165940.06093@domaintje.com>Frank Ederveen writes: >> Execl thoughput 90.8 46.8 <- ??? >> Pipe-based context switching 20.4 9.0 <- ??? >> Shell scripts (8 concurrent) 12.8 12.2 <- ??? >> I don't understand why execl throughput and context switching is TWICE >> slower in SMP mode, and I doesn't understand AT ALL why shell script >> benchmark isn't twice faster. >I don't know Benchbyte, but maybe these are times in seconds and >lower is better? Also, unless you have an automatic multi threading No :-( >compiler like Convex has the second cpu doesn't do you much good >if you only run one process in your benchmark. Well, I can beleive if performance won't increase. But why can it DECREASE? Alex. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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