How do use gperftools to profile mpi program?

What steps will reproduce the problem?
1. mpicc -o t.x t.c -g
2. mpirun_rsh --hostfile=hfile -n 2 
LD_PRELOAD=/home/niuq/tools/gperftools-2.0/gcc-build/lib/libtcmalloc.so 
HEAPPROFILE=./tprofile ./t.x
3. I can get tprofile.0004.heap  tprofile.0017.heap  tprofile.0030.heap but the 
thing is there not each processor seperate heap file. We can not distinguish 
which processor heap file comes from?
What is the expected output? What do you see instead?
Expected heap file seperately for each mpi processor. 

What version of the product are you using? On what operating system?
niuq@node020:~/code$ uname -a
Linux node020.cluster 2.6.32-131.0.15.el6.x86_64 #1 SMP Tue May 10 15:42:40 EDT 
2011 x86_64 x86_64 x86_64 GNU/Linux
gperftools-2.0

Please provide any additional information below.

niuq@node020:~/code$ cat t.c
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include <string.h> 
#include <mpi.h> 
int main(int argc, char *argv[]) { 
    MPI_Init(&argc,&argv);
    int myrank;
    MPI_Comm_rank(MPI_COMM_WORLD, &myrank);
    if(myrank==1)
    {
        size_t x=sizeof(int);
        printf( "size = %lu\n", x ); 
        int i;
        for(i=0;i<10000000;i++)
        {
            unsigned long s=100;
            int* sum=(int*)malloc(s*sizeof(int));
            int k;
            for(k=1;k<s;k++) sum[k]=sum[k-1]+5;
        }
    }
    MPI_Finalize();
    return 0;
} 

mpicc -o t.x t.c -g

Original issue reported on code.google.com by niuqingp...@gmail.com on 2 Apr 2012 at 6:35

sunqi800 / gperftools

How do use gperftools to profile mpi program? #422