参考：GNU timeでプロセスの最大メモリ使用量を取得するシェルスクリプトを書いてみた - N_Nao’s log
/usr/bin/time -lp perl myScript.pl
maximum resident set sizeが最大使用メモリらしい
real 172.55
user 144.37
sys 20.92
12747128832 maximum resident set size
0 average shared memory size
0 average unshared data size
0 average unshared stack size
7352383 page reclaims
3 page faults
0 swaps
22 block input operations
2 block output operations
120 messages sent
121 messages received
0 signals received
215 voluntary context switches
113544 involuntary context switches
