Re: [gmx-users] Inconsistency of multicore simulations in Gromacs 4.5.3

2015-03-16 Thread Mark Abraham
Hi,

What do you mean by exactly the same? MD is chaotic, and unless you run
mdrun in its reproducible mode, you will not get reproducibility of a
trajectory. gmxcheck may help you discover what you have actually got.

And you might want to upgrade such a prehistoric version of GROMACS ;-)

Mark

On Mon, Mar 16, 2015 at 10:49 PM, Fei Zhang f...@vt.edu wrote:

 Dear all,

 Sorry to interrupt.

 I encountered a problem while using Gromacs 4.5.3 with mpi to simulate
 ionic liquid constrained between two constant charged electrodes. However
 when I use 1 core and 32 cores to run same simulation (with same .tpr
 file), the charge density distribution of the first 3000 steps are exactly
 the same, however later, in about 1 steps, the charge density
 distribution of 32 cores and 1 core become different.

 The compiling environment is: 1) gcc/4.7.22) openmpi/1.6.43)
 fftw/3.3.4(double precision).

 I am quite confused about it and wonder if anyone else has encountered the
 same problem.

 Best Regards,

 Fei
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[gmx-users] Inconsistency of multicore simulations in Gromacs 4.5.3

2015-03-16 Thread Fei Zhang
Dear all,

Sorry to interrupt.

I encountered a problem while using Gromacs 4.5.3 with mpi to simulate
ionic liquid constrained between two constant charged electrodes. However
when I use 1 core and 32 cores to run same simulation (with same .tpr
file), the charge density distribution of the first 3000 steps are exactly
the same, however later, in about 1 steps, the charge density
distribution of 32 cores and 1 core become different.

The compiling environment is: 1) gcc/4.7.22) openmpi/1.6.43)
fftw/3.3.4(double precision).

I am quite confused about it and wonder if anyone else has encountered the
same problem.

Best Regards,

Fei
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