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Date: Fri, 22 Mar 2002 08:42:47 -0700 (MST)
From: James Bourne <jbourne@MtRoyal.AB.CA>
Subject: Re: max number of threads on a system
In-Reply-To: <Pine.LNX.3.96.1020322103236.22096C-100000@gatekeeper.tmr.com>
To: Bill Davidsen <davidsen@tmr.com>
Cc: Davide Libenzi <davidel@xmailserver.org>,
        David Schwartz <davids@webmaster.com>, joeja@mindspring.com,
        "linux-kernel@vger.redhat.com" <linux-kernel@vger.kernel.org>
Message-id: <Pine.LNX.4.44.0203220840280.14699-100000@skuld.mtroyal.ab.ca>
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On Fri, 22 Mar 2002, Bill Davidsen wrote:

> On Thu, 21 Mar 2002, Davide Libenzi wrote:
> 
> > On Thu, 21 Mar 2002, David Schwartz wrote:
> > 
> > >
> > >
> > > On Thu, 21 Mar 2002 20:05:39 -0500, joeja@mindspring.com wrote:
> > > >What limits the number of threads one can have on a Linux system?
> > >
> > > 	Common sense, one would hope.
> > >
> > > >I have a simple program that creates an array of threads and it locks up at
> > > >the creation of somewhere between 250 and 275 threads.
> > 
> > $ ulimit -u
> 
> /proc/sys/kernel/threads-max is the system limit. And "locks up" is odd
> unless the application is really poorly written to handle errors. Should
> time out and whine ;-)

One thing to note here, using pthreads there is a limit of 1024
threads per process.  There are patches to glibc to increase this
to a larger number (4096 or 8192).

Regards
James Bourne

-- 
James Bourne, Supervisor Data Centre Operations
Mount Royal College, Calgary, AB, CA
www.mtroyal.ab.ca

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