Timing for GAUSS: BLOCK distribution

I ran my program on the SP2 with 4 nodes. The augmented matrix size is 256 by 256 +1, and the data is read in from the file datafile, which I have stored in my CPS 615 homework directory, in the subdirectory hw4. Using the compiler directive

!HPF$ DISTRIBUTE augmented (BLOCK,*)

merlin4:~/CPS615.dir/hw4> source SETENV
merlin4:~/CPS615.dir/hw4> pghpf -O gauss.hpf -o gauss
** gauss   === End of Compilation 1 ===
** gauss_elim   === End of Compilation 2 ===
1501-510  Compilation successful for file pghpfE_TcVFXAAB.f.
Linking:
merlin4:~/CPS615.dir/hw4> gauss -pghpf -host merlin1,merlin2,merlin3,merlin4 -np
 4 -stat cpus

cpu        real      user       sys     ratio   node
   0*    260.34     16.57     13.93       12%   merlin4
   1     260.38     16.79     13.37       12%   merlin1
   2     260.06     18.30     13.05       12%   merlin2
   3     260.07     18.25     14.42       13%   merlin3
 min     260.06     16.57     13.05
 avg     260.21     17.48     13.69
 max     260.38     18.30     14.42
total    260.38     69.91     54.77     0.48x
merlin4:~/CPS615.dir/hw4>