[mpich-discuss] MPI_Comm_Spawn causing zombies of hydra_pmi_proxy

[Silvan Brändli]

Dear all,

again I have a question related to spawning processes. I understand the 
situation as follows:

My program A spawns program B. Program B spawns program C1, C2 ... 
C10000 ...
Program Cx terminates correctly before Cx+1 is called, however returning 
1 to mpiexec. To handle this I use the workaround as described in 
http://lists.mpich.org/pipermail/discuss/2013-February/000429.html

Now it looks like with every Spawn a "hydra_pmi_proxy" is started, the 
calling program is mpiexec. When the program Cx is finished this 
"hydra_pmi_proxy" remains as a zombie until the programs A, B and 
mpiexec are finished. When approx. 32k of those "hydra_pmi_proxy" exist 
I get some problems (too many processes or something similar).

What can I do to finish "hydra_pmi_proxy" while my programs A, B and 
mpiexec are still running?

I'm glad about every hint.

Best regards
Silvan

-- 
Dipl.-Ing. Silvan Brändli
Numerische Strukturanalyse mit Anwendungen in der Schiffstechnik (M-10)

Technische Universität Hamburg-Harburg
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21073 Hamburg

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