profiling mpi programs is not supported (was: How do use gperftools to profile mpi program?)

Originally reported on Google Code with ID 422

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

Reported by niuqingpeng on 2012-04-02 18:35:48