The Great and Terrible implementation of MPI-2

function index


Terminates MPI execution environment
int MPI_Abort(
  MPI_Comm comm,
  int errorcode


[in] communicator of tasks to abort
[in] error code to return to invoking environment


Terminates all MPI processes associated with the communicator comm; currently this function terminates all processes.  This function does not return so any return value is an error.  The process calling MPI_Abort must be a member of the communicator passed in.  If the communicator is invalid or the process is not a member of the communicator, MPI_Abort is called on MPI_COMM_WORLD.


This routine makes a "best attempt" to abort all tasks in the group of comm. This function does not require that the invoking environment take any action with the error code. However, a Unix or POSIX environment should handle this as a return errorcode from the main program or an abort(errorcode).

MPI implementations are required to define the behavior of MPI_ABORT at least for a comm of MPI_COMM_WORLD. MPI implementations may ignore the comm argument and act as if the comm was MPI_COMM_WORLD.

Thread and Interrupt Safety

The user is responsible for ensuring that multiple threads do not try to update the same MPI object from different threads. This routine should not be used from within a signal handler.

The MPI standard defined a thread-safe interface but this does not mean that all routines may be called without any thread locks. For example, two threads must not attempt to change the contents of the same MPI_Info object concurrently. The user is responsible in this case for using some mechanism, such as thread locks, to ensure that only one thread at a time makes use of this routine. Because the MPI_Abort routine is intended to ensure that an MPI process exits (and possibly an entire job), it cannot wait for a thread to release a lock or other mechanism for atomic access.

Notes for Fortran

All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK) have an additional argument ierr at the end of the argument list. ierr is an integer and has the same meaning as the return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the call statement.

All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER in Fortran.


This function does not return so any return value is erroneous, even MPI_SUCCESS.

Example Code

The following sample code illustrates MPI_Abort.

#include <mpi.h>
int main(int argc, char *argv[])
    MPI_Init(NULL, NULL);
    MPI_Abort(MPI_COMM_WORLD, 911);
    /* No further code will execute */
    return 0;