Date: Tue, 16 Nov 2004 15:38:14 -0500 (EST) From: Daniel Eischen <deischen@freebsd.org> To: Petri Helenius <pete@he.iki.fi> Cc: freebsd-threads@freebsd.org Subject: Re: thread scheduling Message-ID: <Pine.GSO.4.43.0411161533520.27909-100000@sea.ntplx.net> In-Reply-To: <419A42BE.5090507@he.iki.fi>
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On Tue, 16 Nov 2004, Petri Helenius wrote: > > I have an single CPU (2.0GHz P4 Celeron) machine which is practically > empty running an application which dispatches detached threads to do > various kinds of work. It seems that recently process scope threads seem > to have fairly random scheduling latency up to various seconds while > system scope threads work as expected. This behaviour seems to have > introduced between 5.2.1 and 5.3 but cannot point exactly when. I have > printf's next to pthread_create and at the top of the new thread routine > and the delay is usually in order of multiple seconds. The application > also uses itimers if that makes a difference. > > Haven't built a simplified application demonstrating the issue yet, but > will do that if the problem is not known. I don't know about the problem and haven't really been keeping track of what's been merged to -stable. I would suggest checking out the -6 branch library and trying it on -stable (there should be nothing that needs to change for it to run on -stable). I also have some patches at: http://people.freebsd.org/~deischen/kse/libpthread.diffs -- Dan Eischen
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