Sorry, but there is no way to answer this question with what is given. What is "my_sub" doing? Which version of OpenMPI are you talking about, and on what platform?
On Tue, Aug 18, 2009 at 8:28 AM, Julia He <springwater...@yahoo.com> wrote: > Hi, > > I found that the subroutine call inside a loop did not return correct value > after certain iterations. In order to simplify the problem, the inputs to > the subroutine are chosen to be constant, so the output should be the same > for every iteration on every computing node. It is a fortran program, after > the initialization the program goes like this: > > do i = 1, N > call my_sub(A, B, C, re) > print *, mypn, A, B, C, re > end do > > where re is the output value of the my_sub, A, B, C are inputs to my_sub. > > 570 is the number of correct iterations. If the combined instances does not > exceed 570, the output is fine. For example, if I requested 10 computing > nodes and N were 40, so it gives 10*40=400 instances, the output would be > fine. But if the combined instances exceeded 570, the first 570 is fine, but > the rest will return NaN value. For example, if the number of computing > nodes were 20 and N were 40, which gives 20*40=800 instances, then the first > 570 are fine, but the rest are NaN value. > > Does someone know what might cause the problem? I googled it, but can't > find a clue where to start. Please also let me know what else you need to > debug the problem. > > Thanks. > > Julia > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
