On Montag, 15. Mai 2017 15:16:38 CEST Markus Trippelsdorf wrote: > On 2017.05.15 at 15:07 +0200, Mason wrote: > > On 15/05/2017 14:01, Markus Trippelsdorf wrote: > > > Enabling Link Time Optimization may help: -flto=<some number, e.g. the > > > number of cores you have> > > > > I'm confused. Are you suggesting that requesting /more/ optimizations > > might reduce compile+link time? > > Yes. For huge compilation units (like the template heavy example above) > -flto=<number of 'cores'> reduces compile+link time, because it causes > the backend to run in parallel. % time g++-6 -o loadstore -flto=4 loadstore.cpp 72.55s user 1.97s system 205% cpu 36.182 total % time g++-6 -o loadstore loadstore.cpp 63.85s user 0.75s system 99% cpu 1:04.72 total Seems like it would help in the "code - compile - test" cycles, yes. For CI builds it appears to make it slower in total. Cheers, Matthias -- ────────────────────────────────────────────────────────────────────────── Dr. Matthias Kretz https://kretzfamily.de GSI Helmholtzzentrum für Schwerionenforschung https://gsi.de SIMD easy and portable https://github.com/VcDevel/Vc ──────────────────────────────────────────────────────────────────────────
