Date: Tue, 01 Jan 2008 23:44:18 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-performance@freebsd.org Subject: Re: mysql scaling questions Message-ID: <flefo8$cag$1@ger.gmane.org> In-Reply-To: <477AAC90.4050305@FreeBSD.org> References: <20071230134354.GA63555@harmless.hu> <4777A65C.8020406@FreeBSD.org> <20071230141118.GA67574@harmless.hu> <4777AB9C.1010003@FreeBSD.org> <flb6bp$8kq$1@ger.gmane.org> <4779BBE8.2050608@FreeBSD.org> <20080101122249.GA81405@harmless.hu> <477A32EA.4070500@FreeBSD.org> <ad79ad6b0801010534u3336c2d5l630c1d18a8a493cd@mail.gmail.com> <477A4BF1.3050709@FreeBSD.org> <20080101142116.GA94325@harmless.hu> <477A4E28.3010003@FreeBSD.org> <fle6vh$320$1@ger.gmane.org> <477AAC90.4050305@FreeBSD.org>
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[-- Attachment #1 --]
Kris Kennaway wrote:
> So it is using getpid? It should be fine on FreeBSD with the previous
> provisos, but you also need to check Linux behaviour and compare on
> identical hardware before you can draw conclusions.
Here's the source of unixbench syscall benchmark:
unsigned long iter;
void report()
{
fprintf(stderr,"%ld loops\n", iter);
exit(0);
}
int main(argc, argv)
int argc;
char *argv[];
{
int duration;
if (argc != 2) {
printf("Usage: %s duration\n", argv[0]);
exit(1);
}
duration = atoi(argv[1]);
iter = 0;
wake_me(duration, report);
while (1) {
close(dup(0));
getpid();
getuid();
umask(022);
iter++;
}
/* NOTREACHED */
}
As I count it, getpid() is one of 5 syscalls made. Of these, getpid()
and getuid() might be cached on Linux in some way, which actually could,
with the difference in CPU speed, cause the difference. I can't check it
on identical hardware.
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