[mpich-discuss] Killing mpiexec.hydra process

[Kenneth Raffenetti]

Which version of Hydra is this? There was a bug fix that should have 
improved child process cleanup in the 3.1 series.

Ken

On 05/11/2015 12:04 PM, Cayanan, Michael D (398G) wrote:
> Hi,
>
> I'm running the mpiexec.hydra command within a script and there are
> cases where I need to kill this process.
>
> Our application is designed to issue a "pkill -P <process id>" command,
> where the "process id" is the id of the script. Nominally, the pkill
> command is designed to kill the parent and all of its children. However,
> in this case, it turns out that the script and the parent mpiexec.hydra
> processes are killed, but the children processes that are spawned by the
> mpiexec.hydra processes are left running. This is because
> all of those children are parents of the mpiexec.hydra process.
>
> Example:
>
> Process 1: <script command to launch the mpiexec.hydra command>
> Process 2 (Parent 1): mpiexec.hydra command
> Process 3 (Parent 2): Child mpiexec.hydra process
> Process 4 (Parent 2): Child mpiexec.hydra process
> Process 5 (Parent 2): Child mpiexec.hydra process
>
>
> %> pkill -P 1
>
> Processes 1 and 2 are killed, but Processes 3, 4, and 5 are left running.
>
> I've done some online research and it looks like there is a utility
> called "mpicleanup". Has anybody used this tool and is it intended to
> kill an mpiexec.hydra process and all its children in a single command?
> If not, what is the best way to kill the mpiexec.hydra process?
>
> Thanks in advance for your help,
> Mike
>
>
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