On Tue, May 8, 2012 at 1:32 AM, Manfred Gratt <manfred.gratt at uibk.ac.at>wrote:
> when I compile petsc with --with-debugging=0 with gcc and icc in configure > there are different optimization flags set depending on compiler. So is > with gcc -O set wich means -O1 optimization. While with icc -O3 > optimisation is set. Is there a reason only icc gets the high performance > flag while gcc not? Are there any problems when some optimizations are > activated on gcc? I don't know why only -O1 is used with gcc, but you can pass COPTFLAGS='-O3 -march=native' or whatever you like to configure to make it use those instead. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120508/0c447a6d/attachment.htm>
