Hi Brock,
That message should only be 2MB. Are you sure its not a mismatch of message lengths in MPI_Bcast calls? David On 01/04/2011 03:47 AM, Brock Palen wrote:
I have a user who reports that sending a broadcast of 540*1080 of reals (just over 2GB) fails with this: *** An error occurred in MPI_Bcast *** on communicator MPI_COMM_WORLD *** MPI_ERR_TRUNCATE: message truncated *** MPI_ERRORS_ARE_FATAL (your MPI job will now abort) I was reading the archives and there appears to be an issue with large messages. I was a little confused, is there a way to send messages larger than 2GB? The user has access to some IB machines, per a note in the archives there was an issue with writev() would this issue only be related to messages over ethernet? Thanks just trying to get some clarification. Brock Palen www.umich.edu/~brockp Center for Advanced Computing bro...@umich.edu (734)936-1985
