$ perl -Mstrict begun.pl 
Variable "$acc" is not imported at begun.pl line 34.
Variable "$acc" is not imported at begun.pl line 43.
Variable "$acc" is not imported at begun.pl line 57.
Variable "$acc" is not imported at begun.pl line 59.
Global symbol "$threads" requires explicit package name at begun.pl line 6.
Global symbol "$fname" requires explicit package name at begun.pl line 7.
Global symbol "$pwd" requires explicit package name at begun.pl line 8.
Global symbol "$ml" requires explicit package name at begun.pl line 9.
Global symbol "$ml" requires explicit package name at begun.pl line 18.
Global symbol "$size" requires explicit package name at begun.pl line 21.
Global symbol "$time" requires explicit package name at begun.pl line 22.
Global symbol "$start" requires explicit package name at begun.pl line 23.
Global symbol "$size" requires explicit package name at begun.pl line 24.
Global symbol "$start" requires explicit package name at begun.pl line 25.
Global symbol "$threads" requires explicit package name at begun.pl line 27.
Global symbol "@trl" requires explicit package name at begun.pl line 27.
Global symbol "@trl" requires explicit package name at begun.pl line 28.
Global symbol "$acc" requires explicit package name at begun.pl line 34.
Global symbol "$acc" requires explicit package name at begun.pl line 43.
Global symbol "$pwd" requires explicit package name at begun.pl line 43.
Global symbol "$acc" requires explicit package name at begun.pl line 57.
Global symbol "$fname" requires explicit package name at begun.pl line 58.
Global symbol "$fname" requires explicit package name at begun.pl line 58.
Global symbol "$acc" requires explicit package name at begun.pl line 59.
Global symbol "$pwd" requires explicit package name at begun.pl line 59.
Global symbol "$percent" requires explicit package name at begun.pl line 63.
Global symbol "$size" requires explicit package name at begun.pl line 63.
Global symbol "$time" requires explicit package name at begun.pl line 72.
Global symbol "$time" requires explicit package name at begun.pl line 72.
Global symbol "$end" requires explicit package name at begun.pl line 73.
Global symbol "$end" requires explicit package name at begun.pl line 74.
Global symbol "$time" requires explicit package name at begun.pl line 75.
Global symbol "$percent" requires explicit package name at begun.pl line 81.
Global symbol "$percent" requires explicit package name at begun.pl line 81.
Global symbol "$percent" requires explicit package name at begun.pl line 82.
Execution of begun.pl aborted due to compilation errors.
$