malloc_stats test code ran on CCNI BGQ with the XL compiler

build

module load xl
mpicxx mallocStatsTest.cc -o mallocStatsTestXL

mallocStatsTest.cc

#include <stdio.h>
#include <unistd.h>
#include <mpi.h>
#include <malloc.h>


int main (int argc, char** argv)
{
  int rank, size;

  MPI_Init (&argc, &argv);      /* starts MPI */
  MPI_Comm_rank (MPI_COMM_WORLD, &rank);        /* get current process id */
  MPI_Comm_size (MPI_COMM_WORLD, &size);        /* get number of processes */
  mtrace(); 
  if ( 0 == rank ) {
     malloc_stats();
     char* buf = (char*) malloc(1000000*sizeof(char));
     malloc_stats();
     free(buf);
     malloc_stats();
  }

  if ( 0 == rank ) {
     malloc_stats();
     char* buf = new char[1000000];
     malloc_stats();
     delete buf;
     malloc_stats();
  }
  muntrace();

  MPI_Finalize();
  return 0;
}

run.sh

#!/bin/sh
export MALLOC_TRACE=trace.out
time srun ./mallocStatsTestXL

slurm-28746.out

malloc and free - pre alloc
Arena 0:
system bytes     =    9272392
in use bytes     =    7104248
Total (incl. mmap):
system bytes     =   10357832
in use bytes     =    8189688
max mmap regions =          1
max mmap bytes   =    1085440
malloc and free - post alloc
Arena 0:
system bytes     =    9272392
in use bytes     =    7104280
Total (incl. mmap):
system bytes     =   10357832
in use bytes     =    8189720
max mmap regions =          1
max mmap bytes   =    1085440
malloc and free - post delete
Arena 0:
system bytes     =    9272392
in use bytes     =    7104248
Total (incl. mmap):
system bytes     =   10357832
in use bytes     =    8189688
max mmap regions =          1
max mmap bytes   =    1085440
new and delete - pre alloc
Arena 0:
system bytes     =    9272392
in use bytes     =    7104248
Total (incl. mmap):
system bytes     =   10357832
in use bytes     =    8189688
max mmap regions =          1
max mmap bytes   =    1085440
new and delete - post alloc
Arena 0:
system bytes     =    9272392
in use bytes     =    7104280
Total (incl. mmap):
system bytes     =   10357832
in use bytes     =    8189720
max mmap regions =          1
max mmap bytes   =    1085440
new and delete - post delete
Arena 0:
system bytes     =    9272392
in use bytes     =    7104248
Total (incl. mmap):
system bytes     =   10357832
in use bytes     =    8189688
max mmap regions =          1
max mmap bytes   =    1085440

submit cmd

sbatch -t 2 -N 1 -n 1  ./run.sh

trace.out

= Start
@ [0x1000464] + 0x19c5756220 0x4
@ [0x100048c] - 0x19c5756220
@ [0x14094e8] + 0x19c5756220 0x4
@ [0x140af78] - 0x19c5756220
= End