MPIR_Localcopy(357): memcpy arguments alias each other, dst=0x19a5f40 src=0x19a5f40 len=4

It looks like memcpy is doing a check to make sure the source and destination buffers don't overlap. This seems like a bug to me -- when doing an MPI_Get from a buffer to itself, the implementation should probably just do nothing and return. -Nick ________________________________________ From: [email protected] [[email protected]] on behalf of Alessandro Fanfarillo [[email protected]] Sent: Thursday, August 21, 2014 5:25 PM To: [email protected] Subject: [mpich-discuss] MPI_Get on the same memory location Dear all, I'm having the following error: Fatal error in MPI_Get: Internal MPI error!, error stack: MPI_Get(156).......: MPI_Get(origin_addr=0x19a5f40, origin_count=4, MPI_BYTE, target_rank=0, target_disp=0, target_count=4, MPI_BYTE, win=0xa0000000) failed MPIDI_Get(247).....: MPIR_Localcopy(357): memcpy arguments alias each other, dst=0x19a5f40 src=0x19a5f40 len=4 if I try to execute MPI_Get on the same memory location on a shared memory machine (my laptop). I cannot find anything in the standard that denies it for the one-sided. Running with OpenMPI everything works fine. Is it a bug or I missed something in the standard? Thanks. Alessandro -- Alessandro Fanfarillo Dip. di Ingegneria Civile ed Ingegneria Informatica Università di Roma "Tor Vergata" NCAR Office: +1 (303) 497-2442 Tel: +39-06-7259 7719 _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss