MPI_Startall - Starts a collection of requests.
18.2.334.1.1. C Syntax
#include <mpi.h> int MPI_Startall(int count, MPI_Request array_of_requests)
18.2.334.1.2. Fortran Syntax
USE MPI ! or the older form: INCLUDE 'mpif.h' MPI_STARTALL(COUNT, ARRAY_OF_REQUESTS, IERROR) INTEGER COUNT, ARRAY_OF_REQUESTS(*), IERROR
18.2.334.1.3. Fortran 2008 Syntax
USE mpi_f08 MPI_Startall(count, array_of_requests, ierror) INTEGER, INTENT(IN) :: count TYPE(MPI_Request), INTENT(INOUT) :: array_of_requests(count) INTEGER, OPTIONAL, INTENT(OUT) :: ierror
18.2.334.2. INPUT PARAMETER
count: List length (integer).
18.2.334.3. INPUT/OUTPUT PARAMETER
array_of_requests: Array of requests (array of handle).
18.2.334.4. OUTPUT PARAMETER
ierror: Fortran only: Error status (integer).
Starts all communications associated with requests in array_of_requests. A call to MPI_Startall(count, array_of_requests) has the same effect as calls to MPI_Start (&array_of_requests[i]), executed for i=0 ,…, count-1, in some arbitrary order.
A communication started with a call to MPI_Start or MPI_Startall is completed by a call to MPI_Wait, MPI_Test, or one of the derived functions MPI_Waitany, MPI_Testany, MPI_Waitall, MPI_Testall, MPI_Waitsome, MPI_Testsome (these are described in Section 3.7.5 of the MPI-1 Standard, “Multiple Completions”). The request becomes inactive after successful completion by such a call. The request is not deallocated, and it can be activated anew by another MPI_Start or MPI_Startall call.
A persistent request is deallocated by a call to MPI_Request_free (see Section 3.7.3 of the MPI-1 Standard, “Communication Completion”).
where * indicates zero or more repetitions. If the same communication object is used in several concurrent threads, it is the user’s responsibility to coordinate calls so that the correct sequence is obeyed.
A send operation initiated with MPI_Start can be matched with any receive operation and, likewise, a receive operation initiated with MPI_Start can receive messages generated by any send operation.
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_thread, after 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 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_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_FATALCauses the program to abort all connected MPI processes.
MPI_ERRORS_ABORTAn 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_RETURNReturns an error code to the application.
MPI applications can also implement their own error handlers by calling:
MPI_Session_create_errhandler then MPI_Session_set_errhandler or at MPI_Session_init
Note that MPI does not guarantee that an MPI program can continue past an error.
See the MPI man page for a full list of MPI error codes.
See the Error Handling section of the MPI-3.1 standard for more information.