[mpich-discuss] Killing mpiexec.hydra process

[Kenneth Raffenetti]

Sounds good. If you still see issues using 3.1.4, I can investigate.

Ken

On 05/11/2015 12:27 PM, Cayanan, Michael D (398G) wrote:
> Hi Ken,
>
> Looks like we are running 1.5:
>
> $ ./mpich2version
> MPICH2 Version:    	1.5
>
> I guess I should update the software to the 3.1 series to see how this
> behavior has changed.
>
> Thanks,
> Mike
>
>
>
> On 5/11/15 10:19 AM, "Kenneth Raffenetti" <raffenet at mcs.anl.gov> wrote:
>
>> 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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