[gmx-users] why two GTX780ti is slower?
mailmd2011 at gmail.com
Wed May 14 07:03:27 CEST 2014
I've compiled Gromacs in a GPU machine with two GTX780Ti with following
env CC=icc F77=ifort CXX=icpc
<http://4.1.3.049/intel64:/soft/intel/mkl/lib/intel64> cmake ..
-DCMAKE_INSTALL_PREFIX=/soft/gromacs-5.0rc1 -DGMX_MPI=ON -DGMX_GPU=ON
I've got 40ns/day for a 65,000 atoms membrane system under CHARMM36 FF
when one GPU is used, but it is only 27ns/day if I used two GPUs. In
another machine with two GTX690, I used ICC+openmpi instead of ICC+intel
MPI. The same system, I obtained 40ns/day for one GPU, and 60ns/day for
I am just wondering, why it is even slower with two GTX780Ti for my
system, which doesn't happen to GTX690?
thx a lot
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