static int PyMPELog_PackBytes(char bytebuf[], int *position,
char tokentype, int count,
const void *data)
{
int ierr = 0;
#if HAVE_MPE
#if MPE_VERSION==2
if (((unsigned)*position) <= sizeof(MPE_LOG_BYTES))
ierr = MPE_Log_pack(bytebuf, position,
tokentype, count, data);
#endif
#endif /* HAVE_MPE */
return ierr;
}
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;
char processor_name[ MPI_MAX_PROCESSOR_NAME ];
MPE_LOG_BYTES bytebuf;
int bytebuf_pos;
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
/* Get event ID from MPE, user should NOT assign event ID directly */
event1a = MPE_Log_get_event_number();
event1b = MPE_Log_get_event_number();
event2a = MPE_Log_get_event_number();
event2b = MPE_Log_get_event_number();
event3a = MPE_Log_get_event_number();
event3b = MPE_Log_get_event_number();
event4a = MPE_Log_get_event_number();
event4b = MPE_Log_get_event_number();
if ( myid == 0 ) {
MPE_Describe_state( event1a, event1b, "Broadcast", "red" );
MPE_Describe_info_state( event2a, event2b, "Sync", "orange",
"source = %s()'s line %d." );
MPE_Describe_info_state( event3a, event3b, "Compute", "blue",
"mypi = %E computed at iteration %d." );
MPE_Describe_info_state( event4a, event4b, "Reduce", "green",
"final pi = %E at iteration %d." );
}
if ( myid == 0 ) {
n = 1000000;
startwtime = MPI_Wtime();
}
MPI_Barrier( MPI_COMM_WORLD );
MPI_Pcontrol( 1 );
/*
MPE_Start_log();
*/
for ( jj = 0; jj < ITER_COUNT; 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( event2a, 0, NULL );
MPI_Barrier( MPI_COMM_WORLD );
int line_num;
bytebuf_pos = 0;
MPE_Log_pack( bytebuf, &bytebuf_pos, 's',
sizeof(__func__)-1, __func__ );
line_num = __LINE__;
MPE_Log_pack( bytebuf, &bytebuf_pos, 'd', 1, &line_num );
MPE_Log_event( event2b, 0, bytebuf );
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;
bytebuf_pos = 0;
MPE_Log_pack( bytebuf, &bytebuf_pos, 'E', 1, &mypi );
MPE_Log_pack( bytebuf, &bytebuf_pos, 'd', 1, &jj );
MPE_Log_event( event3b, 0, bytebuf );
pi = 0.0;
MPE_Log_event( event4a, 0, NULL );
MPI_Reduce( &mypi, &pi, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD );
bytebuf_pos = 0;
MPE_Log_pack( bytebuf, &bytebuf_pos, 'E', 1, &pi );
MPE_Log_pack( bytebuf, &bytebuf_pos, 'd', 1, &jj );
MPE_Log_event( event4b, 0, bytebuf );
}
#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 );
}
