blj@ravel.csg.uiuc.edu (Bob Janssens) (12/18/89)
We are running UMAX-4.2 R3.3.0 on our 8 processor Multimax 510. I am having some trouble with the barrier synchronization. About 20% of the time my simple gaussian elimination program deadlocks at one of the barriers. However, print statements show that every process reaches the barrier. I have tried the fbarrier and the regular barrier with all three types of blocking, and get similar results with all. I also have an account on the Argonne National labs encore which is running the beta version of UMAX-4.3. Here my program runs fine without any deadlock. Other users on our system have had similar problems with parallel programming. Could this be a problem with our OS? Have other people had similar problems? Thanks, Bob Janssens b-janssens@uiuc.edu Center for Reliable and High Performance Computing