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From: "kcc at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/55309] gcc's address-sanitizer 66% slower than clang's
Date: Thu, 07 Feb 2013 05:02:00 -0000 [thread overview]
Message-ID: <bug-55309-4-kWLIs5eqwm@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-55309-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55309
--- Comment #23 from Kostya Serebryany <kcc at gcc dot gnu.org> 2013-02-07 05:01:53 UTC ---
with the patch from comment 22 (all benchmarks, ref data):
orig patched
400.perlbench, -1.00, 1244.00, -1244.00
401.bzip2, 1189.00, 1137.00, 0.96
403.gcc, 754.00, 750.00, 0.99
429.mcf, 611.00, 610.00, 1.00
445.gobmk, 1211.00, 1167.00, 0.96
456.hmmer, 1834.00, 1501.00, 0.82
458.sjeng, 1353.00, 1288.00, 0.95
462.libquantum, 478.00, 480.00, 1.00
464.h264ref, 1880.00, 1836.00, 0.98
471.omnetpp, 621.00, 621.00, 1.00
473.astar, 766.00, 763.00, 1.00
483.xalancbmk, 515.00, 517.00, 1.00
433.milc, 631.00, 625.00, 0.99
444.namd, 538.00, 538.00, 1.00
447.dealII, 716.00, 719.00, 1.00
450.soplex, 421.00, 415.00, 0.99
453.povray, 433.00, 429.00, 0.99
470.lbm, 415.00, 411.00, 0.99
482.sphinx3, 1377.00, 1343.00, 0.98
The average speedup is similar to what we saw with equivalent optimization in
clang. Strangely, 400.perlbench fails with a warning when built with trunk but
passes with this patch. I did not investigate this further yet.
If we are looking for greater speedup we need to perform more comprehensive
research. I have two wild guesses (not supported by any data).
#1 afaict, the asan pass happens in the middle of the gcc optimization flow.
imho it should happen as late as possible so that the instrumentation
happens on fully optimized code.
#2 asan speed is very sensitive to quality of regalloc. It would be interesting
(and useful anyway) to implement zero-offset-shadow
(https://code.google.com/p/address-sanitizer/wiki/ZeroBasedShadow)
and see how much it helps with performance.
If more than clang's 5% -- we have issues with regalloc, otherwise see #1
next prev parent reply other threads:[~2013-02-07 5:02 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-13 10:01 [Bug other/55309] New: " markus at trippelsdorf dot de
2012-11-13 21:10 ` [Bug other/55309] " konstantin.s.serebryany at gmail dot com
2012-11-13 21:31 ` markus at trippelsdorf dot de
2012-11-14 7:52 ` jakub at gcc dot gnu.org
2012-11-14 16:38 ` jakub at gcc dot gnu.org
2012-11-14 17:03 ` markus at trippelsdorf dot de
2013-02-05 9:22 ` [Bug sanitizer/55309] " kcc at gcc dot gnu.org
2013-02-05 9:43 ` kcc at gcc dot gnu.org
2013-02-05 9:56 ` jakub at gcc dot gnu.org
2013-02-05 10:31 ` kcc at gcc dot gnu.org
2013-02-05 10:42 ` kcc at gcc dot gnu.org
2013-02-05 10:55 ` jakub at gcc dot gnu.org
2013-02-05 11:18 ` markus at trippelsdorf dot de
2013-02-05 11:24 ` jakub at gcc dot gnu.org
2013-02-05 11:26 ` jakub at gcc dot gnu.org
2013-02-05 12:23 ` kcc at gcc dot gnu.org
2013-02-06 10:56 ` dodji at gcc dot gnu.org
2013-02-06 11:19 ` kcc at gcc dot gnu.org
2013-02-06 12:25 ` kcc at gcc dot gnu.org
2013-02-06 12:39 ` rguenth at gcc dot gnu.org
2013-02-06 12:43 ` kcc at gcc dot gnu.org
2013-02-06 12:49 ` jakub at gcc dot gnu.org
2013-02-06 15:03 ` dodji at gcc dot gnu.org
2013-02-07 5:02 ` kcc at gcc dot gnu.org [this message]
2013-02-07 17:01 ` jakub at gcc dot gnu.org
2013-02-07 17:18 ` dvyukov at google dot com
2013-02-08 6:31 ` kcc at gcc dot gnu.org
2013-02-08 9:02 ` jakub at gcc dot gnu.org
2013-02-08 9:13 ` kcc at gcc dot gnu.org
2013-02-08 9:25 ` jakub at gcc dot gnu.org
2013-02-11 14:43 ` kcc at gcc dot gnu.org
2013-02-11 15:03 ` jakub at gcc dot gnu.org
2013-02-12 6:48 ` kcc at gcc dot gnu.org
2013-02-12 7:03 ` kcc at gcc dot gnu.org
2013-02-12 8:40 ` jakub at gcc dot gnu.org
2013-02-12 8:47 ` dvyukov at google dot com
2013-02-12 8:59 ` kcc at gcc dot gnu.org
2013-02-12 11:18 ` kcc at gcc dot gnu.org
2013-02-12 11:31 ` kcc at gcc dot gnu.org
2013-02-12 11:42 ` jakub at gcc dot gnu.org
2013-02-12 14:00 ` howarth at nitro dot med.uc.edu
2013-02-12 14:12 ` jakub at gcc dot gnu.org
2013-02-12 14:42 ` howarth at nitro dot med.uc.edu
2013-02-22 7:11 ` kcc at gcc dot gnu.org
2013-02-22 8:31 ` Joost.VandeVondele at mat dot ethz.ch
2013-02-22 8:36 ` kcc at gcc dot gnu.org
2013-02-22 13:09 ` jakub at gcc dot gnu.org
2013-02-22 13:52 ` kcc at gcc dot gnu.org
2013-02-22 13:55 ` Joost.VandeVondele at mat dot ethz.ch
2013-02-22 14:30 ` kcc at gcc dot gnu.org
2013-02-22 14:54 ` kcc at gcc dot gnu.org
2013-02-22 15:01 ` jakub at gcc dot gnu.org
2013-02-22 15:04 ` jakub at gcc dot gnu.org
2013-02-22 15:06 ` kcc at gcc dot gnu.org
2013-02-22 15:14 ` jakub at gcc dot gnu.org
2013-02-22 16:11 ` joseph at codesourcery dot com
2013-02-26 7:43 ` kcc at gcc dot gnu.org
2013-02-28 11:32 ` kcc at gcc dot gnu.org
2014-01-27 8:22 ` trippels at gcc dot gnu.org
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