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torognes / vsearch

Versatile open-source tool for microbiome analysis
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optimization flag is set to -O2 #480

Closed frederic-mahe closed 2 years ago

frederic-mahe commented 2 years ago

hello @torognes and @xflouris I've just noticed that the compilation optimization flag for vsearch is set to -O2 during configuration (visible when running the make command).

I can't remember why and when that particular level of optimization has been selected, so I report it in case it went unnoticed so far.

torognes commented 2 years ago

I think -O2 is a default.

Previously -O3 was in configure.ac, but I moved those optimization flags out of the configure.ac file with commit d007e76124184d6c95d75cf3567659f0fa9e83ec a while ago, because it seems like it is not the recommended way to do it.

In the README.md it is stated that -O3 is recommended. This is also used in the Dockerfile.

Anyway, I do not think there is any substantial difference between -O2 and -O3 for vsearch.

frederic-mahe commented 2 years ago

Nothing to change then, thanks!