This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug regression/35671] GCC 4.4.x vs. 4.2.x performance regression
- From: "t dot artem at mailcity dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 18 Apr 2009 01:44:01 -0000
- Subject: [Bug regression/35671] GCC 4.4.x vs. 4.2.x performance regression
- References: <bug-35671-5637@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from t dot artem at mailcity dot com 2009-04-18 01:44 -------
Test configuration:
Software: Linux kernel 2.6.28.9 x86, GCC 4.2.4, GCC 4.4.0 RC,
http://www.rarlab.com/rar/unrarsrc-3.8.5.tar.gz
Hardware: AMD64 Dual Core CPU 5600, 1MB x 2 level 2 cache
RAM: DDR2 800MHz 4GB
unrarsrc-3.8.5.tar.gz compiled binary (compilation flags: -march=pentium2 -O2
-ftree-vectorize):
GCC 4.2.4: 180492 bytes
GCC 4.4.0: 196288 bytes
Uncompressing 1GB archive (several hundreds WAV files):
time rar-4.2.4 t -inul archive.rar
real 1m18.413s
user 1m17.758s
sys 0m0.580s
time rar-4.4.0 t -inul archive.rar
real 1m28.021s
user 1m27.344s
sys 0m0.627s
(average results for five runs - disk IO has zero effect, since file resides on
RAM disk).
Summary: 4.4.x binary is 9% larger and produces code which runs 14% slower.
--
t dot artem at mailcity dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|minor |major
Status|RESOLVED |UNCONFIRMED
Known to fail| |4.4.0 4.3.3
Known to work| |4.2.4
Resolution|WONTFIX |
Summary|[POSSIBLY NOT A BUG] GCC |GCC 4.4.x vs. 4.2.x
|4.3.0 vs. 4.2.3 observations|performance regression
Version|4.3.0 |4.4.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35671