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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