On Sep 14, 2013, at 12:21 PM, Huangwei <hz...@cam.ac.uk> wrote: > do i=1, N-1 > allocate (QRECS(A(i))) > itag = i > call mpi_recv(QRECS......., i, itag, .................) > deallocate(QRECS) > enddo
I assume you're doing more than just allocate/mpi_recv/deallocate. :-) I don't know what A(i) is, so it's hard to say whether this is correct or not. > Will this cause any problem using this way to introducing QRECS? I don't know. Can you make a small program that reproduces the problem? > Besides, the reasonable why I did not choose mpi_gatherv is that the QRECS > will put into YVAR in a non-consecutive way. for instance, if I have 4 > processors, the first element in YVAR is from rank 0, second from rank 1 > ......fourth from rank 3, and then fifth from rank 0 again, sixth from rank 1 > again....... But I will try your suggestion. Depending on how big the arrays are, it may still be faster/simpler to gather(v) to a single array and copy to the final array. Shrug. It depends on what your program is doing, and whether that is wort it to you. To be clear: either way should work fine; there may or may not be coding and/or performance implications of each. -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
