[MITgcm-devel] changing -Ofast in linux_amd64_open64

[Jean-Michel Campin]

Hi Oliver,

I am going to change linux_amd64_open64 optfile, to remove the "-ipa" option
(replacing "-Ofast" with "-O3 -OPT:Ofast -ffast-math"):
On acresgrid (login), when I use "-ipa", the little changes I made last Wed. 
in eesupp/src/print.F are causing some differences for advect_xz & the 5 
global_ocean.cs32x15 tests.
see in: http://mitgcm.org/testing/results/2012_03/ when comparing:
     tr_acesgrid-op64_20120330_0/summary.txt
with tr_acesgrid-op64_20120328_0/summary.txt

It seems strange to me and annoying regarding the robustness of the results.
Also without "-ipa", I don't get a compiler internal error in
tutorial_global_oce_lat_lon.

Do you have an idea how the "-ipa" option impact the performance of your runs ?

Cheers,
Jean-Michel