On Wed, 8 Jan 2014, Dafang Wang wrote: > Thanks for your prompt reply. Did you mean turning -O2 "on" or "off"? I got > bad results when turning it on.
I mean using "-O2 -fp-model precise". IIRC that often gets icpc to turn off its inexact-in-floating-point optimizations without forcing it to turn off any optimizations which don't change the final code output. No guarantees, though. I dug into the compiler configuration files https://github.com/manufactured-solutions/MASA/blob/master/m4/common/ax_cxx_minopt.m4 from the manufactured solutions code where we encountered these problems, to see which options we'd ended up needing, and it looks like we eventually gave up on any optimizations at all when we demanded maximum accuracy there. --- Roy ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
