[gmx-developers] Re: flushing files
roland at utk.edu
Wed Oct 13 21:27:50 CEST 2010
On Wed, Oct 13, 2010 at 5:18 AM, Sander Pronk <pronk at cbr.su.se> wrote:
> Just out of curiosity: how long does MPI_File_sync take?
For serial it takes as long as a fsync. Which can take between approximately
1-40ms depending on your machine and file-system. Thus this already becomes
an issue for very frequent writing.
For parallel writing (100nodes) it can be 1-4s for a MPI_File_sync. Thus no
problem if done every 15min but not OK after each frame.
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