[gmx-developers] new 64-bit int support and MPI

Erik Lindahl erik.lindahl at scilifelab.se
Tue Dec 24 13:42:12 CET 2013


Hm - good point. However, can’t we simply ask the MPI library to transport 8 chars instead in that case? (assuming that the endian is the same on all nodes in an MPI job)



On 24 Dec 2013, at 13:34, Mark Abraham <mark.j.abraham at gmail.com> wrote:

> Hi,
> I'm happy with the recent change to requiring 64-bit integers, but I note that this means we have required that the MPI library support the MPI_INT64_T datatype from MPI 2.2. AFAIK that's probably OK in practice, but I thought it worth mentioning / discussing.
> We should update the install guide and add a CMake test for its support, however, since there will still be plenty of people with earlier non-compliant MPI libraries. I imagine CentOS will take about 5 years to update that far...
> Cheers,
> Mark
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