From: Thilo Kielmann Newsgroups: comp.parallel.mpi Subject: Re: Dynamic load determination Date: 18 Nov 1998 09:27:27 GMT Organization: Vrije Universiteit, Amsterdam Message-Id: <72u3tv$ce2$1@star.cs.vu.nl> References: <3651E148.12E39523@usm.edu> User-Agent: tin/pre-1.4-981002 ("Phobia") (UNIX) (SunOS/5.5.1 (sun4u)) Originator: kielmann@kajak.cs.vu.nl Matt Bettencourt wrote: : Is there any command built into MPI that will let me figure out what the : current load on all my processors are?? Example, I have a 64 proc : machine. I start up on all the procs. I determin which are idle (or : close to that) then start the job just on those procs. After about 5 : minutes of run time, I check again and run on the now idle procs. Is : there any routine(s) that will help in doing this?? There is nothing directly in MPI that will do this job. From your description I read that you have a non-dedicated workstation network, and not a single parallel machine. (And that is not really what MPI has been made for...) For observing the load status of workstations, you need something like a resource management system. Jackson and Humphres presented a system close to your needs that presents vectors of cpu loads to applications. (Parallel Computing, 22:1647-1660, 1997). Unfortunately, their system is for PVM and I don't know whether the source is available. Together with my colleagues at Siegen University (Germany) I have worked on a resource management system called Winner that already collects all the information you need. Just delivering it to MPI applications is still on our to-do list ;-) But it should be quite straight forward to do. You can find more about Winner at: http://www.informatik.uni-siegen.de/~kielmann/papers/pdcs98.ps.gz http://www.informatik.uni-siegen.de/~kielmann/papers/alv98.ps.gz Hope that helps, Thilo -- Dr. Thilo Kielmann Dept. of Mathematics and Computer Science, Vrije Universiteit De Boelelaan 1081a, 1081 HV Amsterdam, The Netherlands E-Mail: Thilo.Kielmann@acm.org