micha@laptop ~/prog/perl/test $ ./threads_leak.pl
maxthreads: 300  threadscreated: 300  VmSize:     177468 kB VmRSS:        125216 kB
maxthreads: 300  threadscreated: 600  VmSize:     291888 kB VmRSS:        248072 kB
maxthreads: 300  threadscreated: 900  VmSize:     326356 kB VmRSS:        248520 kB
maxthreads: 300  threadscreated: 1200  VmSize:    426424 kB VmRSS:        249172 kB
maxthreads: 300  threadscreated: 1500  VmSize:    287920 kB VmRSS:        252020 kB
maxthreads: 300  threadscreated: 1800  VmSize:    287920 kB VmRSS:        252464 kB
maxthreads: 300  threadscreated: 2100  VmSize:    313928 kB VmRSS:        252736 kB
maxthreads: 300  threadscreated: 2400  VmSize:   1014284 kB VmRSS:        253800 kB
maxthreads: 300  threadscreated: 2700  VmSize:    525608 kB VmRSS:        372676 kB

micha@laptop ~/prog/perl/test $ ./threads_leak.pl
maxthreads: 300  threadscreated: 300  VmSize:     161832 kB VmRSS:        125272 kB
maxthreads: 300  threadscreated: 600  VmSize:    1873224 kB VmRSS:        128360 kB
maxthreads: 300  threadscreated: 900  VmSize:     288048 kB VmRSS:        248756 kB
maxthreads: 300  threadscreated: 1200  VmSize:   1367664 kB VmRSS:        250560 kB
maxthreads: 300  threadscreated: 1500  VmSize:    370560 kB VmRSS:        249440 kB
maxthreads: 300  threadscreated: 1800  VmSize:    724704 kB VmRSS:        250108 kB
maxthreads: 300  threadscreated: 2100  VmSize:    410060 kB VmRSS:        372136 kB