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use strict; use warnings;

...

printf "duration: %0.03f secs\n", time - $start;

use strict; use warnings;

...

printf "duration: %0.03f secs\n", time - $start;

use strict; use warnings;

...

printf "duration: %0.03f secs\n", time - $start;

    Thread::Semaphore     0.386 secs
    MCE::Mutex::Channel   0.162 secs
    MCE::Mutex::Flock     0.144 secs

    Thread::Semaphore     0.293 secs
    MCE::Mutex::Channel   0.499 secs
    MCE::Mutex::Flock     0.498 secs

    Thread::Semaphore    41.897 secs
    MCE::Mutex::Channel   0.980 secs
    MCE::Mutex::Flock     0.702 secs

    Thread::Semaphore    35.521 secs
    MCE::Mutex::Channel   2.994 secs
    MCE::Mutex::Flock     3.322 secs