Dear
Antonio,
Thank
you for your fast answering.
Do
you know how to disable this “active polling” ?
Greetings,
Philip
Von:
discuss-bounces@mpich.org
[mailto:discuss-bounces@mpich.org] Im Auftrag von "Antonio
J. Peña"
Gesendet: Dienstag, 1. Juli 2014 16:30
An: discuss@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
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--
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@mcs.anl.gov
www.mcs.anl.gov/~apenya
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