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time/s    virtual  residential    
00:00:00  16504     8428
...
00:31:00  39160    31368
00:32:00  40184    32268
00:33:00  41208    33032

#!/usr/bin/perl

...
        usleep($sleep_value * 1000000);
        print "thread id " . threads->tid() . ": Done  sleeping " . $s
+leep_value . " seconds\n";
}

Summary of my perl5 (revision 5 version 10 subversion 1) configuration
+:

...
    usemymalloc=n, bincompat5005=undef
  Compiler:
[...]