I was curious about the startup time of my program, so I wanted to figure out how many lines of code were being loaded and how long that was taking.

So I created "MM.pm", and loaded my top-level module with perl -MMM -MMy::Module -e0. MM shows real time, and cpu for user, system, child user, and child system, and then opens each of the included modules and gives a line count, including a total linecount.

package MM;

my @times = (time, times);

END {
  warn sprintf("real %d, user %.2g, sys %.2g, cuser %.2g, csys %.2g\n"
+,
           map { $_ - shift @times } time, times);

  local *ARGV;
  @ARGV = sort values %INC;
  my $sum = 0;
  while (<>) {
    next unless eof;
    warn "$ARGV: $.\n";
    $sum += $.;
    close ARGV;
  }
  warn "total: $sum\n";
}
1;

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In reply to quick startup time profiler by merlyn

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