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Support auto-configuration of build-max-jobs

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"build-max-jobs" and the "-j" option can now be set to "auto" to use
the number of CPUs in the system. (Unlike build-cores, it doesn't use
0 to imply auto-configuration, because a) magic values are a bad idea
in general; b) 0 is a legitimate value used to disable local
building.)

Fixes #1198.
This commit is contained in:
Eelco Dolstra 2017-02-28 12:54:50 +01:00
parent 3fab1f04a7
commit 7251d048fa
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4 changed files with 18 additions and 7 deletions
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5
doc/manual/command-ref/opt-common.xml
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@ -93,8 +93,9 @@
<term><option>-j</option></term>
<listitem><para>Sets the maximum number of build jobs that Nix will
perform in parallel to the specified number. The default is
specified by the <link
perform in parallel to the specified number. Specify
<literal>auto</literal> to use the number of CPUs in the system.
The default is specified by the <link
linkend='conf-build-max-jobs'><literal>build-max-jobs</literal></link>
configuration setting, which itself defaults to
<literal>1</literal>. A higher value is useful on SMP systems or to