MPI_Cancel - Cancels a communication request.
int MPI_Cancel(MPI_Request *request)
INTEGER REQUEST, IERROR
void Request::Cancel() const
request Communication request (handle).
IERROR Fortran only: Error status (integer).
The MPI_Cancel operation allows pending communications to be canceled. This is required for cleanup. Posting a send or a receive ties up
user resources (send or receive buffers), and a cancel may be needed to free these resources gracefully.
A call to MPI_Cancel marks for cancellation a pending, nonblocking communication operation (send or receive). The cancel call is local. It
returns immediately, possibly before the communication is actually canceled. It is still necessary to complete a communication that has
been marked for cancellation, using a call to MPI_Request_free, MPI_Wait, or MPI_Test (or any of the derived operations).
If a communication is marked for cancellation, then an MPI_Wait call for that communication is guaranteed to return, irrespective of the
activities of other processes (i.e., MPI_Wait behaves as a local function); similarly if MPI_Test is repeatedly called in a busy wait loop
for a canceled communication, then MPI_Test will eventually be successful.
MPI_Cancel can be used to cancel a communication that uses a persistent request (see Section 3.9 in the MPI-1 Standard, "Persistent Commu-
nication Requests") in the same way it is used for nonpersistent requests. A successful cancellation cancels the active communication, but
not the request itself. After the call to MPI_Cancel and the subsequent call to MPI_Wait or MPI_Test, the request becomes inactive and can
be activated for a new communication.
The successful cancellation of a buffered send frees the buffer space occupied by the pending message.
Either the cancellation succeeds or the communication succeeds, but not both. If a send is marked for cancellation, then it must be the
case that either the send completes normally, in which case the message sent is received at the destination process, or that the send is
successfully canceled, in which case no part of the message is received at the destination. Then, any matching receive has to be satisfied
by another send. If a receive is marked for cancellation, then it must be the case that either the receive completes normally, or that the
receive is successfully canceled, in which case no part of the receive buffer is altered. Then, any matching send has to be satisfied by
If the operation has been canceled, then information to that effect will be returned in the status argument of the operation that completes
The primary expected use of MPI_Cancel is in multi-buffering schemes, where speculative MPI_Irecvs are made. When the computation com-
pletes, some of these requests may remain; using MPI_Cancel allows the user to cancel these unsatisfied requests.
Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ func-
tions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
will be used to throw an MPI:Exception object.
Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except for
I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be
used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.
Open MPI 1.2 September 2006 MPI_Cancel(3OpenMPI)