int main(int argc, char *argv[])
{
int myid, numprocs, next, namelen, idx;
char buffer[BUFLEN], processor_name[MPI_MAX_PROCESSOR_NAME];
MPI_Status status;
MPI_Init(&argc,&argv);
MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
MPI_Comm_rank(MPI_COMM_WORLD,&myid);
MPI_Get_processor_name(processor_name,&namelen);
fprintf(stderr,"Process %d on %s\n", myid, processor_name);
strcpy(buffer,"hello there");
if (myid == numprocs-1)
next = 0;
else
next = myid+1;
for (idx = 0; idx < 1000; idx++) {
if (myid == 0) {
/*
printf("%d sending '%s' \n",myid,buffer);
*/
MPI_Send(buffer, strlen(buffer)+1, MPI_CHAR, next, 99,
MPI_COMM_WORLD);
MPI_Send(buffer, strlen(buffer)+1, MPI_CHAR, MPI_PROC_NULL, 299,
MPI_COMM_WORLD);
/*
printf("%d receiving \n",myid);
*/
MPI_Recv(buffer, BUFLEN, MPI_CHAR, MPI_ANY_SOURCE, 99,
MPI_COMM_WORLD, &status);
/*
printf("%d received '%s' \n",myid,buffer);
*/
}
else {
/*
printf("%d receiving \n",myid);
*/
MPI_Recv(buffer, BUFLEN, MPI_CHAR, MPI_ANY_SOURCE, 99,
MPI_COMM_WORLD, &status);
MPI_Recv(buffer, BUFLEN, MPI_CHAR, MPI_PROC_NULL, 299,
MPI_COMM_WORLD, &status);
/*
printf("%d received '%s' \n",myid,buffer);
*/
MPI_Send(buffer, strlen(buffer)+1, MPI_CHAR, next, 99,
MPI_COMM_WORLD);
/*
printf("%d sent '%s' \n",myid,buffer);
*/
}
/* MPI_Barrier(MPI_COMM_WORLD); */
if ( idx % 100 == 0 )
MPE_Log_sync_clocks();
}
MPI_Finalize();
return (0);
}
static int PyMPELog_SyncClocks(void)
{
int ierr = 0;
#if HAVE_MPE
#if MPE_VERSION==2
ierr = MPE_Log_sync_clocks();
#endif
#endif /* HAVE_MPE */
return ierr;
}
void shutdown_mpi(void)
{
MPI_Barrier(MPI_COMM_WORLD); /* Wait for all processes to arrive */
#ifdef MPELOG
MPE_Log_sync_clocks();
#ifdef NO_LLMPE
MPE_Finish_log( progname );
#endif
#endif
MPI_Finalize(); /* Shutdown */
}
int main( int argc, char *argv[] )
{
int n, myid, numprocs, ii, jj;
double PI25DT = 3.141592653589793238462643;
double mypi, pi, h, sum, x;
double startwtime = 0.0, endwtime;
int namelen;
int event1a, event1b, event2a, event2b,
event3a, event3b, event4a, event4b;
int event1, event2, event3;
char processor_name[ MPI_MAX_PROCESSOR_NAME ];
MPI_Init( &argc, &argv );
MPI_Pcontrol( 0 );
MPI_Comm_size( MPI_COMM_WORLD, &numprocs );
MPI_Comm_rank( MPI_COMM_WORLD, &myid );
MPI_Get_processor_name( processor_name, &namelen );
fprintf( stderr, "Process %d running on %s\n", myid, processor_name );
/*
MPE_Init_log() & MPE_Finish_log() are NOT needed when
liblmpe.a is linked with this program. In that case,
MPI_Init() would have called MPE_Init_log() already.
*/
#if defined( NO_MPI_LOGGING )
MPE_Init_log();
#endif
/*
user should NOT assign eventIDs directly in MPE_Describe_state()
Get the eventIDs for user-defined STATES(rectangles) from
MPE_Log_get_state_eventIDs() instead of the deprecated function
MPE_Log_get_event_number().
*/
MPE_Log_get_state_eventIDs( &event1a, &event1b );
MPE_Log_get_state_eventIDs( &event2a, &event2b );
MPE_Log_get_state_eventIDs( &event3a, &event3b );
MPE_Log_get_state_eventIDs( &event4a, &event4b );
if ( myid == 0 ) {
MPE_Describe_state( event1a, event1b, "Broadcast", "red" );
MPE_Describe_state( event2a, event2b, "Sync", "orange" );
MPE_Describe_state( event3a, event3b, "Compute", "blue" );
MPE_Describe_state( event4a, event4b, "Reduce", "green" );
}
/* Get event ID for Solo-Event(single timestamp object) from MPE */
MPE_Log_get_solo_eventID( &event1 );
MPE_Log_get_solo_eventID( &event2 );
MPE_Log_get_solo_eventID( &event3 );
if ( myid == 0 ) {
MPE_Describe_event( event1, "Broadcast Post", "white" );
MPE_Describe_event( event2, "Compute Start", "purple" );
MPE_Describe_event( event3, "Compute End", "navy" );
}
if ( myid == 0 ) {
n = 1000000;
startwtime = MPI_Wtime();
}
MPI_Barrier( MPI_COMM_WORLD );
MPI_Pcontrol( 1 );
/*
MPE_Start_log();
*/
for ( jj = 0; jj < 5; jj++ ) {
MPE_Log_event( event1a, 0, NULL );
MPI_Bcast( &n, 1, MPI_INT, 0, MPI_COMM_WORLD );
MPE_Log_event( event1b, 0, NULL );
MPE_Log_event( event1, 0, NULL );
MPE_Log_event( event2a, 0, NULL );
MPI_Barrier( MPI_COMM_WORLD );
MPE_Log_event( event2b, 0, NULL );
MPE_Log_event( event2, 0, NULL );
MPE_Log_event( event3a, 0, NULL );
h = 1.0 / (double) n;
sum = 0.0;
for ( ii = myid + 1; ii <= n; ii += numprocs ) {
x = h * ((double)ii - 0.5);
sum += f(x);
}
mypi = h * sum;
MPE_Log_event( event3b, 0, NULL );
MPE_Log_event( event3, 0, NULL );
pi = 0.0;
MPE_Log_event( event4a, 0, NULL );
MPI_Reduce( &mypi, &pi, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD );
MPE_Log_event( event4b, 0, NULL );
MPE_Log_sync_clocks();
}
#if defined( NO_MPI_LOGGING )
if ( argv != NULL )
MPE_Finish_log( argv[0] );
else
MPE_Finish_log( "cpilog" );
#endif
if ( myid == 0 ) {
endwtime = MPI_Wtime();
printf( "pi is approximately %.16f, Error is %.16f\n",
pi, fabs(pi - PI25DT) );
printf( "wall clock time = %f\n", endwtime-startwtime );
}
MPI_Finalize();
return( 0 );
}
