Date: Wed, 21 Jul 2004 01:56:42 +0200 From: Dennis Berger <db@nipsi.de> To: jesk <jesk@killall.org> Cc: Robert Watson <rwatson@freebsd.org> Subject: Re: I/O or Threading Suffer Message-ID: <20040720235642.GA42120@nipsi.home.net> In-Reply-To: <056801c46eb3$bd0e2a40$45fea8c0@turbofresse> References: <056801c46eb3$bd0e2a40$45fea8c0@turbofresse>
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On Wed, Jul 21, 2004 at 01:46:12AM +0200, jesk wrote: > hi, > i figured out that the performanceloss only really occur if the process is > heavily writing on the filesystem. > dd if=/dev/zero of=/dev/null bs=128k doesnt hurt much in responsetime > of parallel processes, but when dd operates on the filesystem with of=foo > every process will be affect in executiontime. > a simple ps or ls meanwhile dding onto the disk will be hang for dozen of > seconds. > > i tested it with 4BSD and ULE with and without Preemption. yep same thing here, it seems the process ( the "ps" one) doesn't get cputime or something strange. -db > > > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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