[mpich-devel] when is MPICH going to be count-safe?
robl at mcs.anl.gov
Mon Oct 14 14:25:49 CDT 2013
On Sun, Oct 13, 2013 at 09:13:31PM -0500, Jeff Hammond wrote:
> I'd like to be able to use MPI_Datatypes to send e.g. 4 GiB
> messages. Right now, even 2 GiB fails.
Right on, man. My "large count large type" branch has been stuck in
review purgatory. Think you are you qualified to review
> Code is here https://github.com/jeffhammond/HPCGloves/tree/master/examples/mpi64. Test machine is in MCS.
er, maybe I should say "qualified to review, once I pass your tests":
% ./test_type_contig.x 15
count = 32768
ocount = 32768
% ./test_type_contig.x 25
count = 33554432
ocount = 33554432
% ./test_type_contig.x 30
count = 1073741824
ocount = 1073741824
% ./test_type_contig.x 31
count = 2147483648
ocount = -2147483648
Heh. silent error vs violent explosion. I'll let you consider which
mode is preferable while I go fix my branch.
Mathematics and Computer Science Division
Argonne National Lab, IL USA
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