Date: Sat, 26 Jul 2003 21:45:02 +0800 From: David Xu <davidxu@FreeBSD.org> To: "Petri Helenius" <pete@he.iki.fi>, <freebsd-threads@FreeBSD.org> Subject: Re: libkse "wieght" Message-ID: <200307262145.02854.davidxu@FreeBSD.org> In-Reply-To: <069c01c35375$e9352880$812a40c1@PETEX31> References: <069c01c35375$e9352880$812a40c1@PETEX31>
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On Saturday 26 July 2003 21:00, Petri Helenius wrote: > First of all, I´m very happy with the libkse since a few weeks ago, > scheduling and signals seem to work for me and the application runs > smoother than ever, although with only a handful of threads. > > I was wondering how "expensive" thread creation and termination designed to > be with libkse, say should I just create and throw away tens or hundreds of > threads in a small time or try to "recycle" the worker threads I already > created? With newest libkse source code, I can create 5000 threads and then pthread_join them in 0.6 seconds on my PIII 1Ghz machine. Although it is cheap enough to create thread and throw it away, but caching some threads is still a good idea. > Most threads will be either waiting on network input/output,, > condvar to flip or a sleep to expire. I would expect to have maximum of > 5-10 threads executing at any time but I´m wondering if the traditional > "large poll/select" approach is superior to creating, say, 500 threads? > It depends on application, because poll/select on disk file has no effect, if you want to increase concurrent I/O for disk file, if you don't use AIO, thread is still better then select/poll. > I´m not expecting you to design my app for me but just give insight of how > expensive I should the thread maintenance and switching operations to be > with libkse. By my previous experience with libkse, switching between > threads is lightweight enough not to cause performance issues. I haven´t > tested the creation/termination stuff yet. > > Pete > > _______________________________________________ > freebsd-threads@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-threads > To unsubscribe, send any mail to "freebsd-threads-unsubscribe@freebsd.org"
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