[mpich-discuss] Time distribution of Intel MPI Benchmark (PingPong)

["Antonio J. Peña"]

Unfortunately the default communication channel doesn't have that 
capability. You'll have to recompile MPICH configuring with

--with-device=ch3:sock



   Antonio


On 07/02/2014 01:54 AM, Klaus Philip wrote:
>
> Dear Antonio,
>
> Thank you for your fast answering.
>
> Do you know how to disable this "active polling" ?
>
> Greetings,
>
> Philip
>
> *Von:*discuss-bounces at mpich.org [mailto:discuss-bounces at mpich.org] *Im 
> Auftrag von *"Antonio J. Peña"
> *Gesendet:* Dienstag, 1. Juli 2014 16:30
> *An:* discuss at mpich.org
> *Betreff:* Re: [mpich-discuss] Time distribution of Intel MPI 
> Benchmark (PingPong)
>
>
> Dear Philip,
>
> Both functions are part of MPICH. MPICH uses intentionally active 
> polling to minimize the latency on communications. In short, you get 
> faster communications by repeatedly checking for communication 
> completion during waiting times. So, that's expected.
>
>   Antonio
>
>
> On 07/01/2014 09:16 AM, Klaus Philip wrote:
>
>     Hi,
>
>     I tested mpich2 3.1.1 with the Intel MPI Benchmark, more precisely
>     the "PingPong"-Benchmark.
>
>     It uses the MPI_Send and MPI_Recv function to send one message
>     from /Process 1/ to /Process 2/ and back.
>
>     While the benchmark was running, I executed the Sysprofiler
>     (sysprof) to check the time distribution (Picture below).
>
>     My question is now, if the two marked Processes
>     (*MPID_nem_lmt_shm_progress* and *poll*) are parts of MPICH or the
>     Intel-PingPong-Benchmark, because they are both consuming much
>     time (49,03% and 19,99%).
>
>     Greetings,
>
>     Philip
>
>
>
>
>     _______________________________________________
>
>     discuss mailing listdiscuss at mpich.org  <mailto:discuss at mpich.org>
>
>     To manage subscription options or unsubscribe:
>
>     https://lists.mpich.org/mailman/listinfo/discuss
>
>
>
>
> -- 
> Antonio J. Peña
> Postdoctoral Appointee
> Mathematics and Computer Science Division
> Argonne National Laboratory
> 9700 South Cass Avenue, Bldg. 240, Of. 3148
> Argonne, IL 60439-4847
> apenya at mcs.anl.gov  <mailto:apenya at mcs.anl.gov>
> www.mcs.anl.gov/~apenya  <http://www.mcs.anl.gov/%7Eapenya>
>
>
> _______________________________________________
> discuss mailing list     discuss at mpich.org
> To manage subscription options or unsubscribe:
> https://lists.mpich.org/mailman/listinfo/discuss


-- 
Antonio J. Peña
Postdoctoral Appointee
Mathematics and Computer Science Division
Argonne National Laboratory
9700 South Cass Avenue, Bldg. 240, Of. 3148
Argonne, IL 60439-4847
apenya at mcs.anl.gov
www.mcs.anl.gov/~apenya

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mpich.org/pipermail/discuss/attachments/20140702/c4c25292/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 44398 bytes
Desc: not available
URL: <http://lists.mpich.org/pipermail/discuss/attachments/20140702/c4c25292/attachment.jpe>