/usr/share/doc/libmpich-mpd1.0-dev/examples/cpilog.c is in libmpich-mpd1.0-dev 1.2.7-10ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | #include "mpi.h"
#include "mpe.h"
#include <math.h>
#include <stdio.h>
double f( double );
double f( double a)
{
return (4.0 / (1.0 + a*a));
}
int main( int argc, char *argv[])
{
int n, myid, numprocs, i, j;
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];
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.
*/
/*
MPE_Init_log();
*/
/* Get event ID from MPE, user should NOT assign event ID */
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_state(event2a, event2b, "Compute", "blue");
MPE_Describe_state(event3a, event3b, "Reduce", "green");
MPE_Describe_state(event4a, event4b, "Sync", "orange");
}
if (myid == 0) {
n = 1000000;
startwtime = MPI_Wtime();
}
MPI_Barrier(MPI_COMM_WORLD);
MPI_Pcontrol( 1 );
/*
MPE_Start_log();
*/
for (j = 0; j < 5; j++) {
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(event4a, 0, NULL);
MPI_Barrier(MPI_COMM_WORLD);
MPE_Log_event(event4b, 0, NULL);
MPE_Log_event(event2a, 0, NULL);
h = 1.0 / (double) n;
sum = 0.0;
for (i = myid + 1; i <= n; i += numprocs) {
x = h * ((double)i - 0.5);
sum += f(x);
}
mypi = h * sum;
MPE_Log_event(event2b, 0, NULL);
MPE_Log_event(event3a, 0, NULL);
MPI_Reduce(&mypi, &pi, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
MPE_Log_event(event3b, 0, NULL);
}
/*
MPE_Finish_log("cpilog");
*/
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);
}
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