Hi Team, I am trying to run an application using MVAPICH2-2.0. The application compiles without any error, but at runtime, aborts with following error: Fatal error in PMPI_Isend:Invalid tag, error stack:PMPI_Isend(149): MPI_Isend(buf=0x7f59b5124300, count=8, MPI_UNSIGNED_LONG, dest=0, tag=1073741824, comm=0x84000001, request=0x132ae24) failed PMPI_Isend(98).: Invalid tag, value is 1073741824 I contacted MVAPICH2 team for this issue: http://mailman.cse.ohio-state.edu/pipermail/mvapich-discuss/2015-June/005623... They suggested me to contact MPICH team, as the issue is coming from higher level MPICH code. Can you please help me in resolving this. Regards, Chaitra _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss