don't know why, a.out is a cpp program making a 400MB size vector

[joshuaho67]

$ timeout/timeout -m 1000000 ./a.out
ps: illegal argument: f
usage: ps [-AaCcEefhjlMmrSTvwXx] [-O fmt | -o fmt] [-G gid[,gid...]]
[-g grp[,grp...]] [-u [uid,uid...]]
[-p pid[,pid...]] [-t tty[,tty...]] [-U user[,user...]]
ps [-L]
INTERNAL CPU 0.00 MEM 0 MAXMEM -1 STALE 0 MAXMEM_RSS -1
Fail: Bad close ps: at timeout/timeout line 253.