Maybe this was not clear from my first mail: When I set the number of
processes to two or more, not a single test is started. And there are
enough resources available, at least to start some tests.

Am 07.03.2015 um 14:16 schrieb Volker Braun:
> The parallel doctester doesn't error out in some instances where
> resource limits are hit, and sometimes just hangs at the end waiting for
> the process that failed to spawn. The fact that it works when you reduce
> the number of parallel processes strongly suggests that this is what you
> are hitting.
> 
> 
> On Saturday, March 7, 2015 at 1:52:05 PM UTC+1, tha...@debian.org wrote:
> 
>     Hi,
> 
>     I am experimenting with building Sage in a Debian unstable chroot and
>     have a hard time figuring out why parallel doctesting does not work.
>     I wonder if it has something to do with the chroot. I already run into
>     the problem that /dev/shm was not user-writable and fixed that. The
>     script from [1] now runs without error so /dev/pts should also be in
>     place.
> 
>     When I run the test suite in parallel it ends up in the "while True"
>     loop of parallel_dispatch() in src/sage/doctest/forker.py as intended,
>     however top shows that no processes are using any CPU.
> 
>     When I run
>     ./sage -tp 1 --long --all
>     parallel_dispatch() is also used but now everything works.
> 
>     Any ideas what about the chroot could cause this or how I can find out
>     more? Parallel building works in the chroot by the way.
> 
>     Best,
>     Tobias
> 
>     [1] http://trac.sagemath.org/ticket/5965
>     <http://trac.sagemath.org/ticket/5965>
> 
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