Hello All, On my 4-node Beowulf Cluster, when I run my PDE solver code (compiled with mpif90 of openmpi-installed-with-gfortran) with -np 4 launched only on the Head Node (without providing -machinefile), it gives me correct results. ONLY one problem is there: when I monitor RAM behavior it gets filling at a constant speed throughout the RUN of program, till I get final result. So Why the usage of RAM is constantly increasing (although this is not the case with relevant serial code of the same problem/algorithm/method).
Secondly when I launch the same compiled code on 4 nodes (with -machinefile option). Then I do not get correct result. The convergence gets very much slow down after few iterations, ultimately resulting in NaN values of problem variables. I would be very grateful for having comments for the remedy of above two difficulties/confusions. with best regards, Amjad Ali. _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
