[mpich-discuss] Hydra torque support issues

Bharath Ramesh bramesh at vt.edu
Fri Apr 19 07:36:29 CDT 2013

On 4/19/2013 3:10 AM, Pavan Balaji wrote:
> On 04/18/2013 06:56 PM US Central Time, Bharath Ramesh wrote:
>>> I'm particularly interested in whether mpiexec recognizes pbs as a
>>> possible launcher or not.  If it recognizes pbs as a launcher, it should
>>> automatically select it where possible.
>> It is using pbs as the launcher. The problem is with the setting of the
>> session id for the forked hydra_pmi_proxy process on mother superior.
>> Since the hydra_pmi_proxy process has the session id set to the bash
>> process instead mpi_exec process. As a result of this torque is unable
>> to track the resources consumed by the process. If you look at the
>> openmpi processes their session id is set correctly and torque is able
>> to track the resources consumed.
> Ah, OK.  Sorry I lost track of the original issue in this email chain.
> You are right about this issue.  The basic problem is that launching
> proxies using tm_spawn tends to create a different session ID for them.
> I've created a ticket to track it:
> https://trac.mpich.org/projects/mpich/ticket/1812
Not a problem. I understand using tm_spawn to launch proxies on the 
sister moms. To launch proxy on the mother superior one doesnt need to 
use tm_spawn, i.e., mpiexec can fork it on mother superior. I havent 
looked through the code to see if this is the issue.


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