Parallel compression not using all available CPU

Matthew Dillon dillon at
Tue Dec 13 12:56:41 PST 2016

Never turn hyper-threading off if running (any) BSD or Linux.  The
schedulers understand hyperthreads.

In terms of compression programs, presumably they have an option to specify
how many threads to create to do the compression.  Simply test with 1, 2,
and 4 threads to determine the optimal number.

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