Re: Hardware limits on numbers of threads?

From: Andi Kleen (
Date: Thu Sep 19 2002 - 04:36:11 EST

Ulrich Drepper <> writes:

> 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.

It also was alwas incorrect for x86-64/64bit progreams, which do not
use a LDT entry for each thread.

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