Under the hood (MCE::Shared::Server), the boilerplate is the same between OO and TIE for the most part. For Perl-like behavior, the TIE interface involves additional overhead from Perl itself.
MCE::Mutex is used internally for locking. There are 10 locks, one per data channel. A worker from MCE, MCE::Hobo, or threads is assigned a data-channel automatically in a round-robin fashion. 10 workers max can obtain an exclusive lock simultaneously. The unidirectional command-channel involves no locking.
Other parallel modules on MetaCPAN may benefit from multiple data channels simply by calling MCE::Shared::init() inside the worker.
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