kragen@thrifty:~/devel$ ./hashsize.pl
zero hashes:
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
kragen   31416  0.0  2.5  12752  9712 pts/6    S+   23:31   0:00      |   \_ /usr/bin/perl -w ./hashsize.pl
kragen   31417  0.0  0.3   4132  1380 pts/6    R+   23:31   0:00      |       \_ sh -c ps fauxw | egrep 'PID|./hashsize.pl'
a hundred thousand hashes:
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
kragen   31416 56.0  4.8  21848 18776 pts/6    S+   23:31   0:00      |   \_ /usr/bin/perl -w ./hashsize.pl
kragen   31420  0.0  0.3   4128  1388 pts/6    S+   23:31   0:00      |       \_ sh -c ps fauxw | egrep 'PID|./hashsize.pl'
kragen   31422  0.0  0.3   4128  1432 pts/6    R+   23:31   0:00      |           \_ /bin/sh /bin/egrep PID|./hashsize.pl
a hundred thousand hashes with 20 items:
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
kragen   31416 12.6 65.7 262032 254200 pts/6   S+   23:31   0:14      |   \_ /usr/bin/perl -w ./hashsize.pl
kragen   31430  0.6  0.3   4128  1380 pts/6    S+   23:32   0:00      |       \_ sh -c ps fauxw | egrep 'PID|./hashsize.pl'
kragen   31434  0.0  0.1   2852   692 pts/6    S+   23:32   0:00      |           \_ grep -E PID|./hashsize.pl
Killed