[jira] [Created] (MESOS-4709) Enable compiler optimization by default

["Neil Conway (JIRA)" <ji...@apache.org>]

Neil Conway created MESOS-4709:
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             Summary: Enable compiler optimization by default
                 Key: MESOS-4709
                 URL: https://issues.apache.org/jira/browse/MESOS-4709
             Project: Mesos
          Issue Type: Improvement
          Components: general
            Reporter: Neil Conway


At present, Mesos defaults to compiling with "-O0"; to enable compiler
optimizations, the user needs to specify "--enable-optimize" when running {{configure}}.

We should change the default for the following reasons:

(1) The autoconf default for CFLAGS/CXXFLAGS is "-O2 -g". Anecdotally,
I think most software packages compile with a reasonable level of
optimizations enabled by default.

(2) I think we should make the default configure flags appropriate for
end-users (rather than Mesos developers): developers will be familiar
enough with Mesos to tune the configure flags according to their own
preferences.

(3) The performance consequences of not enabling compiler
optimizations can be pretty severe: 5x in a benchmark I just ran, and
we've seen between 2x and 30x (!) performance differences for some
real-world workloads.



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