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/*=========================================================================
Program: Visualization Toolkit
Module: MPIController.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include <mpi.h>
#include "vtkMPIController.h"
#include "vtkProcessGroup.h"
#include "ExerciseMultiProcessController.h"
#include "vtkSmartPointer.h"
#define VTK_CREATE(type, name) \
vtkSmartPointer<type> name = vtkSmartPointer<type>::New()
namespace
{
int mpiTag = 5678;
int data = -1;
}
// returns 0 for success
int CheckNoBlockSends(vtkMPIController* controller)
{
int retVal = 0;
// processes send their rank to the next, higher ranked process
int myRank = controller->GetLocalProcessId();
int numRanks = controller->GetNumberOfProcesses();
vtkMPICommunicator::Request sendRequest;
data = myRank;
if(myRank != numRanks - 1)
{
if(controller->NoBlockSend(&data, 1, myRank+1, mpiTag, sendRequest) == 0)
{
vtkGenericWarningMacro("Problem with NoBlockSend.");
retVal = 1;
}
}
return retVal;
}
// returns 0 for success
int CheckNoBlockRecvs(vtkMPIController* controller, int sendSource,
int wasMessageSent, const char* info)
{
int myRank = controller->GetLocalProcessId();
int retVal = 0;
if(myRank)
{
int flag = -1, actualSource = -1, size = -1;
if(controller->Iprobe(sendSource, mpiTag, &flag, &actualSource,
&size, &size) == 0)
{
vtkGenericWarningMacro("Problem with Iprobe " << info);
retVal = 1;
}
if(flag != wasMessageSent)
{
if(wasMessageSent)
{
vtkGenericWarningMacro("Did not receive the message yet but should have " << info);
}
else
{
vtkGenericWarningMacro(" Received a message I shouldn't have " << info);
}
retVal = 1;
}
if(wasMessageSent == 0)
{ // no message sent so no need to check if we can receive it
return retVal;
}
else
{
if(actualSource != myRank-1)
{
vtkGenericWarningMacro("Did not receive the proper source id " << info);
retVal = 1;
}
if(size != 1)
{
vtkGenericWarningMacro("Did not receive the proper size " << info);
retVal = 1;
}
}
int recvData = -1;
vtkMPICommunicator::Request recvRequest;
if(controller->NoBlockReceive(&recvData, 1, sendSource, mpiTag, recvRequest) == 0)
{
vtkGenericWarningMacro("Problem with NoBlockReceive " << info);
retVal = 1;
}
recvRequest.Wait();
if(recvData != myRank - 1)
{
vtkGenericWarningMacro("Did not receive the proper information " << info);
retVal = 1;
}
}
return retVal;
}
// returns 0 for success
int ExerciseNoBlockCommunications(vtkMPIController* controller)
{
if(controller->GetNumberOfProcesses() == 1)
{
return 0;
}
int retVal = CheckNoBlockRecvs(
controller, vtkMultiProcessController::ANY_SOURCE, 0, "case 1");
// barrier to make sure there's really no message to receive
controller->Barrier();
retVal = retVal | CheckNoBlockSends(controller);
// barrier to make sure it's really a non-blocking send
controller->Barrier();
int myRank = controller->GetLocalProcessId();
retVal = retVal | CheckNoBlockRecvs(controller, myRank - 1, 1, "case 2");
// do it again with doing an any_source receive
controller->Barrier();
retVal = retVal | CheckNoBlockSends(controller);
// barrier to make sure it's really a non-blocking send
controller->Barrier();
retVal = retVal | CheckNoBlockRecvs(
controller, vtkMultiProcessController::ANY_SOURCE, 1, "case 3");
return retVal;
}
int MPIController(int argc, char* argv[])
{
// This is here to avoid false leak messages from vtkDebugLeaks when
// using mpich. It appears that the root process which spawns all the
// main processes waits in MPI_Init() and calls exit() when
// the others are done, causing apparent memory leaks for any objects
// created before MPI_Init().
MPI_Init(&argc, &argv);
VTK_CREATE(vtkMPIController, controller);
controller->Initialize(&argc, &argv, 1);
int retval = ExerciseMultiProcessController(controller);
retval = retval | ExerciseNoBlockCommunications(controller);
// The previous run of ExerciseMultiProcessController used the native MPI
// collective operations. There is also a second (inefficient) implementation
// of these within the base vtkCommunicator class. This hack should force the
// class to use the VTK implementation. In practice, the collective
// operations will probably never be used like this, but this is a convenient
// place to test for completeness.
VTK_CREATE(vtkProcessGroup, group);
group->Initialize(controller);
vtkSmartPointer<vtkMultiProcessController> genericController;
genericController.TakeReference(
controller->vtkMultiProcessController::CreateSubController(group));
if (!retval)
{
retval = ExerciseMultiProcessController(genericController);
}
controller->Finalize();
return retval;
}
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