or download this
--foo_a.pl's marker inserted when run at LN11 in 1173964_a.pl:
$arg: 1, $start: 1476409956.16692, $duration: 0.0165810585
+021973
--foo_a.pl's marker inserted when run at LN11 in 1173964_a.pl:
...
$arg: 998, $start: 1476409968.54356, $duration: 0.01149606
+70471191
$arg: 999, $start: 1476409968.55507, $duration: 0.01226401
+32904053
$arg: 1000, $start: 1476409968.56735, $duration: 0.0137550
+830841064