In that case, I have a small question concerning design: Suppose task-based parallellism where one node (master) distributes work/tasks to 2 other nodes (slaves) by means of an MPI_Put. The master allocates 2 buffers locally in which it will store all necessary data that is needed by the slave to perform the task. So I do an MPI_Put on each of my 2 buffers to send each buffer to a specific slave. Now I need to know when I can reuse one of my buffers to already store the next task (that I will MPI_Put later on). The only way to know this is call MPI_Complete. But since this is blocking and if this buffer is not ready to be reused yet, I can neither verify if the other buffer is already available to me again (in the same thread).
I would very much appreciate input on how to solve such issue ! thanks in advance, toon On Tue, Feb 22, 2011 at 7:21 PM, Barrett, Brian W <bwba...@sandia.gov>wrote: > On Feb 18, 2011, at 8:59 AM, Toon Knapen wrote: > > > (Probably this issue has been discussed at length before but > unfortunately I did not find any threads (on this site or anywhere else) on > this topic, if you are able to provide me with links to earlier discussions > on this topic, please do not hesitate) > > > > Is there an alternative to MPI_Win_complete that does not 'enforce > completion of preceding RMS calls at the origin' (as said on pag 353 of the > mpi-2.2 standard) ? > > > > I would like to know if I can reuse the buffer I gave to MPI_Put but > without blocking on it, if the MPI lib is still using it, I want to be able > to continue (and use another buffer). > > > There is not. MPI_Win_complete is the only way to finish a MPI_Win_start > epoch, and is always blocking until local completion of all messages started > during the epoch. > > Brian > > -- > Brian W. Barrett > Dept. 1423: Scalable System Software > Sandia National Laboratories > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
