RFR: 8210416: [linux] Poor StrictMath performance due to non-optimized compilation

Andrew Haley aph at redhat.com
Mon Sep 10 09:05:18 UTC 2018


On 09/05/2018 02:12 PM, Severin Gehwolf wrote:
> Is there a good
> reason to not use -O3 -ffp-contract=off everywhere?

Is there a good reason to use -O3 rather than -O2? -O3 can bloat the
code which can increase cache pressure, which is not always noticeable
in benchmarks but hurts real-world programs. Unless benchmarks are
significantly better at -O3, -O2 is a good default choice.

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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