From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Wed, 20 Oct 2010 07:19:09 -0600
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From: andrey mirtchovski <mirtchovski@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] Parallel mk?
Topicbox-Message-UUID: 6af85b8a-ead6-11e9-9d60-3106f5b1d025

I guess the simple answer is that mk _always_ parallelizes.

from the man page:

"The environment variable $NPROC determines how many targets may be
updated simultaneously; Some operating systems, e.g., Plan 9, set
$NPROC automatically to the number of CPUs on the current machine."