This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug rtl-optimization/31021] gfortran 20% slower than ifort on CP2K computational kernel
- From: "jv244 at cam dot ac dot uk" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 10 May 2008 12:30:13 -0000
- Subject: [Bug rtl-optimization/31021] gfortran 20% slower than ifort on CP2K computational kernel
- References: <bug-31021-6642@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from jv244 at cam dot ac dot uk 2008-05-10 12:30 -------
(In reply to comment #6)
> With current trunk, I see current mainline gfortran being 5% faster than Intel
> 10.0 on a Dual-Core AMD Opteron(tm) Processor 2212 at 2GHz. Joost, on your
> particular setup, does this still run too slow?
Right now, the testcase in comment 1 still is 20% slower ifort/gcc.
This is, however, with gfortran 4.3.0. Furthermore, it matters on which CPU you
run this (in particular Intel vs. AMD).
To summarize:processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz
stepping : 6
ifort (IFORT) 9.1 20060707
Kernel time 3.812238
gcc version 4.3.0 (GCC)
Kernel time 4.5482836
I'll try to build trunk on this machine and test again, but it might not be for
today.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31021