Re: Max number of pthreads in one process?
Re: Max number of pthreads in one process?
- Subject: Re: Max number of pthreads in one process?
- From: Wade Tregaskis <email@hidden>
- Date: Tue, 20 May 2008 00:07:22 -0700
uname -a returns Darwin anvil.arl.army.mil 8.11.1 Darwin Kernel
Version
8.11.1: Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/
RELEASE_I386 i386
i386. This system is a fully patched 10.4.11 system.
Although I too am curious what's up with this, I cannot reproduce
using 10.5.2 on my system. Have you tried on Leopard yourself?
In any case you should file a bug report (http://bugreport.apple.com/)
to ensure that the relevant people hear about your issue.
This intrigued me so I decided to try to track it down. Especially
since what I do see on Leopard is that the maximum number of threads
your demo app can create is 2559. When I looked into the kernel code,
I found that unsurprisingly there's a compile-time limit on the number
of threads per process, THREAD_MAX, which is 2560 in Leopard. When
this is hit thread_create_internal fails and returns KERN_FAILURE,
which I verified as best I can is what actually happens on my system;
this propagates back all the way to userspace where it's translated to
EAGAIN by the pthread library.
However, it looks like this is also what the limit was on Tiger (and
Panther, though on Jaguar it was 1024). So I'm curious how you're
able to create more threads than this? It doesn't look like it from
your uname output, but are you running a modified kernel? [[ It looks
like you could raise this limit easily enough by recompiling, but it
may not actually be safe to do so. ]]
Wade
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