hydra: sessions not correctly tracked in pbs environments

[mpichbot]

Originally by balaji on 2013-04-19 02:08:49 -0500

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We do not correctly track session IDs on the pbs_mom node with Hydra in pbs environments. We use tm_spawn() even for launching the proxy on the local node, causing it to be launched as a separate process session.

The attached file (provided by Bharath Ramesh @ Virginia Tech) gives more information on the error.

[mpichbot]

Originally by balaji on 2013-04-19 02:09:00 -0500

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Attachment added: mpi_ps_axf.out (4.3 KiB)

[hzhou]

We use tm_spawn to launch hydra_pmi_proxy, which seems to always launch into a new process session. I guess we need check whether the proxy is on the same node as mpiexec and use fork instead when it's on the local node.