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From: Nils Becker <nils.becker@bioquant.uni-heidelberg.de>
Date: Thu, 12 May 2016 18:13:01 +0200
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Subject: [Caml-list] flambda optimization settings

hi,

i'm happy to report one more data point on flambda speedup.

(best of 3, wall clock time, 4 cores running with parmap)
-Oclassic 18.5s
-O2 	  17.0s
-O3	  14.2s

so, a nice 20% speedup with no work.

this brings me to my question: given that O2 vs O3 does seem to matter,
is it actually important at what optimization level linked libraries are
compiled on a +flambda switch?
who controls that, the package author or the user?

n.


ps, full disclosure:

this is based on code that does stochastic simulation (basically
euler-maruyama forward integration), uses Gsl for heavy random number
generation but also does some floating point arithmetic in the inner
loop, and uses exceptions as part of control flow.