Date: Thu, 18 Jul 2002 00:00:19 -0700 (PDT) From: Bruce Evans <bde@zeta.org.au> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/40714: Functions with more than 1 arguments Gets More Executing Time. Message-ID: <200207180700.g6I70JaR087602@freefall.freebsd.org>
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The following reply was made to PR kern/40714; it has been noted by GNATS. From: Bruce Evans <bde@zeta.org.au> To: Si-Liang Chang <slchang@csie.nctu.edu.tw> Cc: freebsd-gnats-submit@FreeBSD.ORG Subject: Re: kern/40714: Functions with more than 1 arguments Gets More Executing Time. Date: Thu, 18 Jul 2002 16:37:04 +1000 (EST) On Wed, 17 Jul 2002, Si-Liang Chang wrote: > >Description: > When running my molecule dynamics simulation programs on FreeBSD, they are always about 33% slower than those (with the same conditions) run on a Linux box or Solaris. In order to simplify the problem, we run several testing programs. Finally, we conclude that, functions with more than 1 arguments spend much executing time. > >How-To-Repeat: > In Program 1, it spends about 7.534u on our PPro FreeBSD 4.6R mechine. > In Program 2, it spends about 2.904u on our PPro FreeBSD 4.6R mechine. > > In the meanwhile, > In Program 1, it spends about 2.56u on our PPro Solaris 8 mechine. > In Program 2, it spends about 2.66u on our PPro Solaris 8 mechine. I think this is actually a stack alignment problem (partly in FreeBSD, partly in gcc). It is not present in -current. Try using gcc-3.1 from ports for time-critical floating-point applications. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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