David Hows 05b3178ca4 Zlib gets a 50-60% performance win when compiled with -O2 (#5838) ... Chasing a performance regression has lead me to this change, going from default optimization gives a significant performance win. The sweet spot for zlib is apparently `-O2`, both `-Ofast` and `-O3` are slightly worse (regression is about 3% compared with `-O2) in my testing. Happy to share my methodology with people so we can benchmark on a wider variety of systems.		2017-10-25 13:53:35 +02:00
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spack	Zlib gets a 50-60% performance win when compiled with -O2 (#5838)	2017-10-25 13:53:35 +02:00