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Efﬁcient Processing Focus on maximizing machine utilization Google tries for ~80% utilization
Different non blocking i/o asynchronous programming
EM.deferon ﬁrst invocation, spawns up EM.threadpool_sizethreads in a poolall the threads read procs from a queue and executethem in parallel to the reactor threadoptional second proc is invoked with the result of theﬁrst proc, but back inside the reactor thread