MPI_ABORT(3)					     Open MPI					      MPI_ABORT(3)

MPI_Abort — Terminates MPI execution environment.

SYNTAX
   C Syntax
	  #include <mpi.h>

	  int MPI_Abort(MPI_Comm comm, int errorcode)

   Fortran Syntax
	  USE MPI
	  ! or the older form: INCLUDE 'mpif.h'
	  MPI_ABORT(COMM, ERRORCODE, IERROR)
	       INTEGER	       COMM, ERRORCODE, IERROR

   Fortran 2008 Syntax
	  USE mpi_f08
	  MPI_Abort(comm, errorcode, ierror)
	       TYPE(MPI_Comm), INTENT(IN) :: comm
	       INTEGER, INTENT(IN) :: errorcode
	       INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT PARAMETERS
       • comm: Communicator of tasks to abort.

       • errorcode: Error code to return to invoking environment.

OUTPUT PARAMETER
       • ierror: Fortran only: Error status (integer).

DESCRIPTION
       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).

       The long-term goal of the Open MPI implementation is to terminate all processes in all tasks that contain a
       process in comm, and the error code is not returned to the invoking environment. At the moment, this  isn’t
       fully implemented and MPI_Abort will terminate the entire job.

       Note: All associated processes are sent a SIGTERM.

ERRORS
       Almost  all MPI routines return an error value; C routines as the return result of the function and Fortran
       routines in the last argument.

       Before the error value is returned, the current MPI error handler associated with the communication  object
       (e.g.,  communicator, window, file) is called.  If no communication object is associated with the MPI call,
       then the call is considered attached to MPI_COMM_SELF and will call the associated MPI error handler.  When
       MPI_COMM_SELF  is  not  initialized  (i.e., before MPI_Init <#mpi-init>/MPI_Init_thread <#mpi-init-thread>,
       after MPI_Finalize <#mpi-finalize>, or when using the Sessions Model  exclusively)  the	error  raises  the
       initial	error  handler.	 The  initial  error  handler can be changed by calling MPI_Comm_set_errhandler <#
       mpi-comm-set-errhandler> on MPI_COMM_SELF when using the World model,  or  the  mpi_initial_errhandler  CLI
       argument	  to   mpiexec	 or   info  key	 to  MPI_Comm_spawn  <#mpi-comm-spawn>/MPI_Comm_spawn_multiple	<#
       mpi-comm-spawn-multiple>.  If no other appropriate error handler has been set, then  the	 MPI_ERRORS_RETURN
       error  handler  is  called  for	MPI I/O functions and the MPI_ERRORS_ABORT error handler is called for all
       other MPI functions.

       Open MPI includes three predefined error handlers that can be used:

       • MPI_ERRORS_ARE_FATAL Causes the program to abort all connected MPI processes.

       • MPI_ERRORS_ABORT An error handler that can be invoked on a communicator, window, file, or  session.  When
	 called	 on a communicator, it acts as if MPI_Abort was called on that communicator. If called on a window
	 or file, acts as if MPI_Abort was called on a communicator containing	the  group  of	processes  in  the
	 corresponding window or file. If called on a session, aborts only the local process.

       • MPI_ERRORS_RETURN Returns an error code to the application.

       MPI applications can also implement their own error handlers by calling:

       • MPI_Comm_create_errhandler	 <#mpi-comm-create-errhandler>	   then	    MPI_Comm_set_errhandler	<#
	 mpi-comm-set-errhandler>

       • MPI_File_create_errhandler	<#mpi-file-create-errhandler>	  then	   MPI_File_set_errhandler	<#
	 mpi-file-set-errhandler>

       • MPI_Session_create_errhandler	 <#mpi-session-create-errhandler>   then   MPI_Session_set_errhandler	<#
	 mpi-session-set-errhandler> or at MPI_Session_init <#mpi-session-init>

       • MPI_Win_create_errhandler	<#mpi-win-create-errhandler>	  then	    MPI_Win_set_errhandler	<#
	 mpi-win-set-errhandler>

       Note that MPI does not guarantee that an MPI program can continue past an error.

       See the MPI man page <#open-mpi> for a full list of MPI error codes <#open-mpi-errors>.

       See the Error Handling section of the MPI-3.1 standard for more information.

Copyright
       2003-2026, The Open MPI Community

						   Mar 05, 2026					      MPI_ABORT(3)
