[AMBER] GPUs parallel problem

From: Meng Wu <wumeng.shanghaitech.edu.cn>
Date: Thu, 4 May 2017 08:26:20 +0000

Dear All,
  I have a problem about GPUs parallel met these days. There are 4 GPUs/node in our lab, when I use two of them ("export CUDA_VISIBLE_DEVICES=0,1/2,3 mpirun -np 2 pmemd.cuda.MPI -O ..." ), the speed is normal; but when I use all("export CUDA_VISIBLE_DEVICES=0,1,2,3 mpirun -np 4 pmemd.cuda.MPI -O ..."") , the speed dropped dramatically. I don't know what's the problem in and how to deal with it if I want to use 4 GPUs in parallel to get a higher speed.

  Any suggestions would be greatly appreciated.Thank you in advance!

All the best,
Wu Meng
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Received on Thu May 04 2017 - 02:00:03 PDT
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