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Pentium 4 Optimization Complimenting icc 5.0
- From: "Walton, Shane" <swalton at dsrnet dot com>
- To: <gcc at gnu dot org>
- Date: Wed, 6 Feb 2002 09:36:41 -0500
- Subject: Pentium 4 Optimization Complimenting icc 5.0
I have been benchmarking Dual 1GHz Pentium 3 vs. Dual 1.7GHz Pentium 4
Xeon systems with
known UNIX/LINUX benchmark suites such as "ubench" and "unixbenchmark".
My findings are
almost unbelievable. The P3 system outperforms the P4 system by 20%.
I have my hands on an Intel C++ Compiler (5.0) for Linux optimized for
Pentium 4. Rebuilding
the benchmark utils with this compiler skewed the results so that the P4
was 30% better than
the P3 system.
All this comes down to using a "gcc" compiler vs. the Intel "icc". Is
there something that I don't
know about gcc, such as a patch or optimization flags that would give me
the expected performance
from a gcc built binary on a P4 system? If not, is there any plans to
add such support? Thanks.
Here is the basic config for testing environment:
RedHat 6.2 and RedHat 7.2
egcs 2.91.66 (egcs-1.1.2 release)
Linux Kernel 2.4.16 SMP
Intel C++ Compiler for Linux 5.0
Shane M. Walton, Software Engineer
Digital System Resources, Inc.