Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |  

This web mail archive is frozen.

This page is part of a frozen web archive of this mailing list.

You can still navigate around this archive, but know that no new mails have been added to it since July of 2016.

Click here to be taken to the new web archives of this list; it includes all the mails that are in this frozen archive plus all new mails that have been sent to the list since it was migrated to the new archives.

Subject: [OMPI users] MPI_sendrecv = MPI_Send+ MPI_RECV ?
From: Enrico Barausse (enrico.barausse_at_[hidden])
Date: 2008-09-13 08:50:50


I apologize in advance if my question is naive, but I started to use
open-mpi only one week ago.
I have a complicated fortran 90 code which is giving me a segmentation
fault (address not mapped). I tracked down the problem to the
following lines:


the MPI_send is executed by a process (say 1) which sends the array
toroot to another process (say 0). Process 0 successfully receives the
array toroot (I print out its components and they are correct), does
some calculations on it and sends back an array tonode to process 1.
Nevertheless, the MPI_Send routine above never returns controls to
process 1 (although the array toroot seems to have been transmitted
alright) and gives a segmentation fault (Signal code: Address not
mapped (1))

Now, if replace the two lines above with


I get no errors and the code works perfectly (I tested it vs the
serial version from which I started). But, and here is my question,
shouldn't MPI_sendrecv be equivalent to MPI_Send followed by MPI_RECV?

thank you in advance for helping with this