[mpich-discuss] Killing mpiexec.hydra process

[Cayanan, Michael D (398G)]

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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