If you are hoping for a return on timeout, almost zero CPU use while waiting and fast response you will need to be pretty creative. Here is a simple solution that may be OK if you do not need both fast response and low CPU load.
flag = false; for ( ; ! is_time_up(); ) MPI_Test( ........ &flag, ......); if (flag) break; usleep(..) } Make the sleep short or leave it out and you hog CPU, make it long and your lag time for detecting a message that arrives after you enter the loop will average 1/2 the sleep plus a bit. Dick Treumann - MPI Team IBM Systems & Technology Group Dept X2ZA / MS P963 -- 2455 South Road -- Poughkeepsie, NY 12601 Tele (845) 433-7846 Fax (845) 433-8363 users-boun...@open-mpi.org wrote on 12/04/2009 01:38:05 PM: > [image removed] > > Re: [OMPI users] Mimicking timeout for MPI_Wait > > Jeff Squyres > > to: > > Open MPI Users > > 12/04/2009 01:38 PM > > Sent by: > > users-boun...@open-mpi.org > > Please respond to Open MPI Users > > On Dec 3, 2009, at 3:31 AM, Katz, Jacob wrote: > > > I wonder if there is a BKM (efficient and portable) to mimic a > timeout with a call to MPI_Wait, i.e. to interrupt it once a given > time period has passed if it hasn’t returned by then yet. > > Pardon my ignorance, but what does BKM stand for? > > Open MPI does not currently implement a timeout-capable MPI_WAIT. > Such functionality probably could be implemented (e.g., in the MPIX > "experimental" namespace), especially since Open MPI polls for > progress -- it could check a timer every so often while polling -- > but no one has done so. > > -- > Jeff Squyres > jsquy...@cisco.com > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
