trunk/examples/timing/timing_test.pl

   1 #!/usr/bin/perl
   2
   3 # The range of grid sizes to consider
   4 @range=(10..40);
   5
   6 # The number of trials to consider. If this is set to one, the time for a
   7 # single trial will be outputted. For higher values, the mean of all the trials
   8 # will be outputted, along with the standard deviation.
   9 $tries=3;
  10
  11 # The flags to pass for code optimization
  12 $opt="-O3";
  13
  14 foreach $r (@range) {
  15
  16         # Compile the code with the current grid size
  17         system "g++-mp-4.8 $opt -I../../src -DNNN=$r -o timing_test "
  18                 ."-L../../src timing_test.cc";
  19
  20         # Carry out the trials for this grid size
  21         $st=$stt=0;
  22         foreach $t (1..$tries) {
  23
  24                 # Run the code, and output the timing information to the
  25                 # "time_temp" file.
  26                 system "./timing_test >time_temp";
  27
  28                 # Read the "time_temp" file to find the duration of the run
  29                 open F,"time_temp" or die "Can't open timing file: $!";
  30                 ($t)=split ' ',<F>;
  31                 $st+=$t;$stt+=$t*$t;
  32                 close F;
  33         }
  34
  35         # Compute the mean and variance and print to standard output
  36         $st/=$tries;
  37         $stt=$stt/$tries-$st*$st;$stt=$stt>0?sqrt($stt):0;
  38         print "$r $st $stt\n";
  39 }
  40
  41 # Delete the temporary timing file
  42 unlink "time_temp";