On Tue, Mar 25, 2014 at 3:19 PM, Jan Blechta <[email protected]>wrote:
> On Tue, 25 Mar 2014 15:03:41 +0100 > Johan Hake <[email protected]> wrote: > > > Nice documentation of the problem! > > > > There is some commented out code in output.py which uses commands > > instead of popen. This also seems to work. Does that work for you too? > > It does not. On my machine, mentioned outcommented code does > > commands.getstatusoutput -> os.popen -> posix.popen -> [6] > Ok. > But this maybe very system dependent, so it may work somewhere. > Yes you are probably right there. Johan > > Jan > > > > > Johan > > > > > > On Tue, Mar 25, 2014 at 2:57 PM, Jan Blechta > > <[email protected]>wrote: > > > > > After some digging, it seems that segfaults observed on > > > OFED/InfiniBand clusters (see [1], [2], [3]) are caused by > > > implementation of > > > > > > subprocess.Popen > > > > > > Check your local subprocess.py:_execute_child. Parent does not seem > > > to keep hands of memory between fork() and exec() (as required [4], > > > [5]), especially as it is fiddling with garbage collector. > > > > > > I tried switching to os.system (posix implementation in [6]) > > > instead of subprocess.Popen and it seems promising. Check out [7] > > > or enclosed patch. > > > > > > Jan > > > > > > [1] https://answers.launchpad.net/dolfin/+question/219270 > > > [2] https://answers.launchpad.net/dolfin/+question/225946 > > > [3] http://fenicsproject.org/pipermail/fenics/2013-June/000398.html > > > [4] https://www.open-mpi.org/faq/?category=openfabrics#ofa-fork > > > [5] > > > > http://www.openfabrics.org/downloads/OFED/release_notes/OFED_3.12_rc1_release_notes#3.03 > > > [6] > > > http://svn.python.org/projects/python/trunk/Modules/posixmodule.c > > > [7] https://bitbucket.org/blechta/instant/branch/blechta/ofed-fork > > > _______________________________________________ fenics mailing list > > > [email protected] > > > http://fenicsproject.org/mailman/listinfo/fenics > > > > > > > >
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