From: Sierk Poetting Newsgroups: comp.parallel Subject: Parallel Computing, sleeping Processes Date: 17 Oct 1998 07:42:30 GMT Organization: The University of Arizona Approved: bigrigg@cs.cmu.edu Message-Id: <709hp6$9f0$1@encore.ece.cmu.edu> Originator: bigrigg@ece.cmu.edu Hi, I am runing a program on an SGI-multiprocessor system (14 processors, IRIX 6.5), using the autoparallelization option of the latest MIPSpro C++ compiler. If almost nobody is on the machine I get a very good performance, the code is using up to 8 processors. But once more processors are used by others, my performance goes down by a factor of ca. 20, although there are still enough processors (>8) around that are not doing anything. My child processes (created once a parallel section is executed) are sleeping a lot. I have the same priority level as all the other users and there is still enough memory available. Is there a way I can avoid this or restrict the execution of my program to certain processors , so that I can definitely avoid collisions with users using other processors?? If somebody could help me, that would be really nice, thanks already, Sierk -- Articles to bigrigg+parallel@cs.cmu.edu (Admin: bigrigg@cs.cmu.edu) Archive: http://www.hensa.ac.uk/parallel/internet/usenet/comp.parallel