problem with +devices using

From: nikolaev_at_spbau.ru
Date: Tue Apr 05 2016 - 06:35:23 CDT

Hello,

I use a CUDA build of NAMD, and want to run 2 jobs simultaneously.
We have 4 devices, so I assign +devices 0,1 for the first job and
+devices 2,3 for the second.
When I run the first job, everything is ok, and it runs well on 2 devices
and uses 65-70% of the devices' resources.
But when I add the second job, the performance drops immediately to 10-11%
on all 4 devices!

How to solve this problem?

Here is the command I run namd:

/home/nikolaev_d/NAMD_2.11_Linux-x86_64-multicore-CUDA/namd2
+setcpuaffinity +p18 +devices 0,1 +idlepoll A.conf > A.log

Thank you in advance,
Dmitrii.

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