From: Dan Kegel <dank@kegel.com>
To: Ulrich Drepper <drepper@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Hardware limits on numbers of threads?
Date: Wed, 18 Sep 2002 09:30:10 -0700 [thread overview]
Message-ID: <3D88AA12.9D52C892@kegel.com> (raw)
In-Reply-To: 3D882500.2000105@redhat.com
Ulrich Drepper wrote:
> > http://people.redhat.com/drepper/glibcthreads.html says:
> >
> >>Hardware restrictions put hard limits on the number of
> >>threads the kernel can support for each process. ...
> >
> > Is this true? Where does the limit come from?
>
> This was and is true with the kernel before 2.5.3<mumble> when Ingo
> introduced TLS support since the thread specific data had to be
> addressed via LDT entries and the LDT holds at most 8192 entries. The
> GDT based solution now implemented in the kernel has no such limitation
> and the number of threads you can create with the new thread library is
> only limited by system resources.
Thanks. I've updated http://www.kegel.com/c10k.html#threaded
accordingly.
- Dan
next prev parent reply other threads:[~2002-09-18 16:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-18 6:43 Hardware limits on numbers of threads? Dan Kegel
2002-09-18 7:02 ` Ulrich Drepper
2002-09-18 16:30 ` Dan Kegel [this message]
2002-09-18 19:19 ` Jamie Lokier
2002-09-19 9:36 ` Andi Kleen
2002-09-18 7:29 ` Giuliano Pochini
2002-09-18 11:37 ` Denis Vlasenko
2002-09-18 7:05 ` Jakub Jelinek
2002-09-18 11:57 ` Brian Gerst
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