[mpich-discuss] Problem in using wmpiexec.exe in Windows XP

[jayesh at mcs.anl.gov]

Hi,
 Which version of MPICH2 are you using ? If I understand you correctly, are you saying that your MPI program takes the same amount of time with 100 & 1Gbps n/ws but the MPI program launch environment (MPICH2 runtime initialization etc) takes more time with the 1Gbps n/w ?
 What is the time difference that you see with the two networks ? 
 Did you change the number of processes running on the individual nodes when you changed your network (MPI processes running on the same node, MPI processes running across network etc)?
 Does running other MPI programs (eg: c:\program files\MPICH2\examples\cpi.exe) take more time with the 1Gbps network ?

Regards,
Jayesh
----- Original Message -----
From: "lhy stony" <lhy2008lx at gmail.com>
To: "MPICH讨论" <mpich-discuss at mcs.anl.gov>
Sent: Wednesday, May 19, 2010 8:29:46 PM GMT -06:00 US/Canada Central
Subject: [mpich-discuss] Problem in using wmpiexec.exe in Windows XP



Hi, all 
I am using wmpiexec.exe to run my MPI program in windows xp. When I ran the program in a 100Mbps network, everything was OK. But after I improve my network to 1000Mbps, it seems that wmpiexec.exe cost more time to initialize, cause in the first a few seconds, the usage of CPU does not change much which is obviously abnormal according to my program. 
In my program, I use MPI_Wtime to calculate the processing time. The time that printed by my program is correct according to my program, but the actual processing time is much longer. I don't know why and how to fix it. 
Anyone can help me? 
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