[mvapich-discuss] MV2_CPU_MAPPING doesn't work on all the nodes

[Ju JiaJia]

Hi all:

I'm running a program with 32 processes on 4 nodes using 8 cores each .
Each node has two 6-core Xeon processor and all nodes is free. Running
command:
mpiexec -n 32 -hostfile mfile.1 -env MV2_CPU_MAPPING 0:1:2:3:6:7:8:9
./namd2 apoa1.namd

Here is mfile.1:
[Sat Jun 23 10:41:38]user39 at m1:bin$ cat mfile.1
c04b04:8
c04b05:8
c04b06:8
c04b07:8

After subbmitting the job, i logon to the nodes in mfile.1, i find not all
nodes use the cores as i specified. C04b04 use  0:1:2:3:6:7:8:9, but the
last three don't. I didn't change MV2_ENABLE_AFFINITY, so it's 1 by default.
Why MV2_CPU_MAPPING won't work ?
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