From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 1988 invoked by alias); 23 Jan 2011 19:38:50 -0000 Received: (qmail 1979 invoked by uid 22791); 23 Jan 2011 19:38:49 -0000 X-SWARE-Spam-Status: No, hits=-2.8 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,TW_DB,TW_PB X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Sun, 23 Jan 2011 19:38:35 +0000 From: "dominiq at lps dot ens.fr" To: gcc-bugs@gcc.gnu.org Subject: [Bug lto/45810] 40% slowdown when using LTO for a single-file program X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: lto X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: dominiq at lps dot ens.fr X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Date: Sun, 23 Jan 2011 21:12:00 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2011-01/txt/msg02395.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45810 --- Comment #17 from Dominique d'Humieres 2011-01-23 19:38:30 UTC --- With the patch in comment #15 and -finline-limit=300, I get ================================================================================ Date & Time : 23 Jan 2011 20:18:02 Test Name : pbharness Compile Command : gfcp %n.f90 -Ofast -funroll-loops -ftree-loop-linear -fomit-frame-pointer -finline-limit=300 -fwhole-program -flto -o %n Benchmarks : ac aermod air capacita channel doduc fatigue gas_dyn induct linpk mdbx nf protein rnflow test_fpu tfft Maximum Times : 300.0 Target Error % : 0.200 Minimum Repeats : 2 Maximum Repeats : 5 Benchmark Compile Executable Ave Run Number Estim Name (secs) (bytes) (secs) Repeats Err % --------- ------- ---------- ------- ------- ------ ac 3.55 54576 8.12 2 0.0062 aermod 103.51 1595448 18.87 2 0.0079 air 8.87 90048 6.89 2 0.0798 capacita 5.84 89056 40.27 2 0.0199 channel 1.62 34448 2.98 2 0.0168 doduc 14.30 203936 27.79 2 0.0162 fatigue 4.89 89264 4.74 2 0.0106 gas_dyn 11.72 148176 4.64 5 0.0535 induct 10.87 205976 14.00 2 0.0036 linpk 1.58 21536 21.71 2 0.0415 mdbx 5.60 84752 12.56 2 0.1871 nf 7.24 83712 29.23 5 0.0744 protein 11.81 163760 35.10 2 0.0342 rnflow 14.86 171392 26.91 2 0.0223 test_fpu 11.35 145848 11.03 2 0.0952 tfft 1.10 22072 3.30 2 0.1817 Geometric Mean Execution Time = 12.36 seconds to be compared to the lowest Geometric Mean I have got so far (most of the difference is due to nf which depends a lot of the mood of my laptop) ================================================================================ Date & Time : 22 Dec 2010 10:33:08 Test Name : pbharness Compile Command : gfc %n.f90 -Ofast -funroll-loops -ftree-loop-linear -fomit-frame-pointer -finline-limit=600 --param hot-bb-frequency-fraction=2000 -fwhole-program -flto -o %n Benchmarks : ac aermod air capacita channel doduc fatigue gas_dyn induct linpk mdbx nf protein rnflow test_fpu tfft Maximum Times : 300.0 Target Error % : 0.200 Minimum Repeats : 2 Maximum Repeats : 5 Benchmark Compile Executable Ave Run Number Estim Name (secs) (bytes) (secs) Repeats Err % --------- ------- ---------- ------- ------- ------ ac 11.55 58672 8.11 2 0.0123 aermod 164.78 1522240 19.11 2 0.1151 air 20.73 85984 6.87 5 0.1914 capacita 14.66 105472 40.22 2 0.0584 channel 3.22 34448 2.92 4 0.1714 doduc 24.70 212360 27.81 2 0.1025 fatigue 9.81 85144 4.70 3 0.1862 gas_dyn 24.13 144240 4.66 5 0.4507 induct 22.50 214136 13.69 2 0.1096 linpk 2.56 21536 21.68 2 0.0231 mdbx 8.93 84744 12.52 2 0.0080 nf 22.61 104136 27.63 2 0.0778 protein 26.19 155768 35.51 2 0.0127 rnflow 30.99 163200 26.15 2 0.0248 test_fpu 18.79 145848 10.98 2 0.0182 tfft 1.92 22072 3.29 2 0.0304 Geometric Mean Execution Time = 12.27 seconds