Date: Tue, 27 Jan 2004 04:21:07 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: Daniel Eischen <eischen@vigrid.com> Cc: freebsd-threads@freebsd.org Subject: Re: "maxthr" state Message-ID: <Pine.BSF.4.21.0401270418570.87984-100000@InterJet.elischer.org> In-Reply-To: <Pine.GSO.4.10.10401270136090.23737-100000@pcnet5.pcnet.com>
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On Tue, 27 Jan 2004, Daniel Eischen wrote: > On Mon, 26 Jan 2004, Craig Rodrigues wrote: > > > On Fri, Jan 23, 2004 at 03:25:19PM -0800, Julian Elischer wrote: > > > > > > > > > On Fri, 23 Jan 2004, Alex Boisvert wrote: > > > > > > > > > > > Nevermind, I discovered the kernel sysctl > > > > "kern.threads.max_threads_per_proc" with default value 150. I bumped > > > > the value to 300 and the app runs fine. (We simulate 250 clients with > > > > 250 connections or threads, hence the need for a large value...) > > > > > > yes, the number could be made bigger but we didn't want to make it > > > too easy for wildly out-of-control threadded programs to > > > kill the system while the threading system is still "young".. > > > > 150 is a perfectly reasonable number to start with, but I can see it > > could be a problem later on when KSE goes "live". > > Due to programming languages like Java, there are a lot > > of threads-happy coders out there (unfortunately). > > Remember though that kern.threads.max_threads_per_proc are the > number of kernel threads for the process, not the number of > userland threads. Threads blocked in userland don't consume > a kernel thread. On the other hand, if the threads are IO > bound, they will get blocked in the kernel and consume a > kernel thread. We are limitted by hardware to 8191 kernel threads on x86 but that could be a LOT of user threads.. Hmm how many 64k stacks can you fit in 2GB? hmmmm 2^16 into 2^31... well that limits us to 32k threads :-) > > -- > Dan Eischen > >
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