[PVFS-users]

[bruno.agneray at hp.com]

Hi,

On a rocks cluster 3.2.0
(pvfs-kernel-1.6.0-1,pvfs-1.6.0-1,contrib-pvfs-config-1.6.0-1),
I compiled the following program that save 'n' doubles in a file :

go.c _______________________________________________________________________

#include <stdio.h>
#include <stdlib.h>

void main(int argc, char **argv)
{
  FILE *out_file;
  long nblocs=0;
  long n;
  double *tab;


  if (argc != 2)
  {
    printf ("Syntax : %s [size]\n", argv[0]);
    exit (-1);
  }
  else
  {
    n = atol (argv[1]);
  }

  tab = (double*) calloc(n,sizeof(double));

  if (tab==NULL)
  {
    printf("Cannot allocate tab\n");
    exit (-1);
  }

  out_file=fopen("out","w");

  if (out_file == NULL)
  {
    printf ("Cannot open file out\n");
    exit (-1);
  }

  nblocs=fwrite(tab,sizeof(double),n,out_file);

  printf ("%ld blocs saved\n", nblocs);

  fclose(out_file);
}
________________________________________________________________________________


To compile :
cc -o go go.c

To execute :
go 1000000

The problem :

When executing the file in pvfs, when n is greater than 1048575, the out
file is empty.
There is no problem on NFS or local file system :
(workdir : NFS, /mnt/pvfs : PVFS)

$ df -k /mnt/pvfs /workdir
Filesystem           1K-blocks      Used Available Use% Mounted on
tantale-1-0:/pvfs-meta
                     2963523328 153168896 2810354432   6% /mnt/pvfs
tantalems:/work      987841120 118933340 818728356  13% /work
$ cd /mnt/pvfs
$ /mnt/pvfs/go 1000000
1000000 blocs saved
$ ls -l out
-rw-r--r--    1 support  gerance   8000000 Sep 14 18:26 out
$ /mnt/pvfs/go 1048576
0 blocs saved
$ ls -l out
-rw-r--r--  32767 support  gerance         0 Sep 15 11:42 out
$ cd /workdir
$ /mnt/pvfs/go 1000000
1000000 blocs saved
$ ls -l out
-rw-r--r--    1 support  gerance   8000000 Sep 14 18:27 out
$ /mnt/pvfs/go 1048576
1048576 blocs saved
$ ls -l out
-rw-r--r--    1 support  gerance   8388608 Sep 14 18:27 out

The incorrect number of link on the file "out" on pvfs is not systematic.

Is this problem solved in pvfs-1.6.2 ?

Regards,

Bruno