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IDProjectCategoryView StatusLast Update
0000322OpenFOAMBugpublic2012-01-05 10:33
Reporteruser281Assigned Touser2 
Status closedResolutionno change required 
Summary0000322: ICC Compiler Flags Incorrect
DescriptionThe compiler flags used for ICC compilation are currently set that they will compile programs that are unusable by AMD processors.
Additional Information/home/coffeewave/a/whitsonl/.OpenFOAM/OpenFOAM-2.0.x/wmake/rules/linux64Icc/c++Opt should be edited to remove the -SSE3 option.
TagsNo tags attached.



2011-10-22 16:11

manager   ~0000741

We chose the options for the Intel compiler to optimise for the Intel processors but even with these solver still run faster when compiled with gcc. Given that Icc was written for the Intel processors rather than AMD should we select default options that favor AMD over Intel? Are there option on Icc which create executables for the AMD processors which are faster than the best gcc can do?


2011-10-22 16:22

updater   ~0000743

There are various indications that one _should not_ use Icc for AMD processors - one indication:

According to reference #19 in that wiki page: - aside from Icc, it seems that Gcc, Open64 and PGI are compilers that AMD "knows" optimization flags for their CPUs.


2012-01-05 10:33


orphaned report - closing

Issue History

Date Modified Username Field Change
2011-10-22 15:46 user281 New Issue
2011-10-22 16:11 henry Note Added: 0000741
2011-10-22 16:22 wyldckat Note Added: 0000743
2012-01-05 10:33 user2 Note Added: 0000899
2012-01-05 10:33 user2 Status new => closed
2012-01-05 10:33 user2 Assigned To => user2
2012-01-05 10:33 user2 Resolution open => no change required