kragen@thrifty:~/devel$ ./hashsize.pl
zero hashes:
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
kragen   31394  0.0  0.3   4464  1460 pts/6    S+   23:26   0:00      |   \_ /usr/bin/perl -w ./hashsize.pl
kragen   31395  0.0  0.3   4132  1388 pts/6    S+   23:26   0:00      |       \_ sh -c ps fauxw | egrep 'PID|./hashsize.pl'
kragen   31397  0.0  0.1   2852   696 pts/6    S+   23:26   0:00      |           \_ grep -E PID|./hashsize.pl
a hundred thousand hashes:
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
kragen   31394  0.0  2.4  12476  9476 pts/6    S+   23:26   0:00      |   \_ /usr/bin/perl -w ./hashsize.pl
kragen   31398  0.0  0.3   4128  1384 pts/6    R+   23:26   0:00      |       \_ sh -c ps fauxw | egrep 'PID|./hashsize.pl'
kragen   31400  0.0  0.1   4128   424 pts/6    R+   23:26   0:00      |           \_ sh -c ps fauxw | egrep 'PID|./hashsize.pl'
a hundred thousand hashes with 20 items:
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
kragen   31394 92.8  2.4  12476  9476 pts/6    S+   23:26   0:07      |   \_ /usr/bin/perl -w ./hashsize.pl
kragen   31401  0.0  0.3   4132  1388 pts/6    S+   23:26   0:00      |       \_ sh -c ps fauxw | egrep 'PID|./hashsize.pl'
kragen   31403  0.0  0.1   2372   400 pts/6    R+   23:26   0:00      |           \_ /bin/sh /bin/egrep PID|./hashsize.pl