From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 8489 invoked by alias); 10 Dec 2013 00:39:25 -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 Received: (qmail 8469 invoked by uid 48); 10 Dec 2013 00:39:22 -0000 From: "ben.maurer at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/59439] std::locale uses atomic instructions on construction Date: Tue, 10 Dec 2013 00:39:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: libstdc++ X-Bugzilla-Version: 4.8.3 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: ben.maurer at gmail dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: attachments.created Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2013-12/txt/msg00798.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59439 --- Comment #3 from Ben Maurer --- Created attachment 31405 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31405&action=edit Benchmark _build/opt/experimental/bmaurer/benchmark snprintf 1 threads took 20 ms 2 threads took 20 ms 3 threads took 20 ms 4 threads took 20 ms 5 threads took 22 ms .. 31 threads took 43 ms iostream 1 threads took 108 ms 2 threads took 219 ms 3 threads took 371 ms 4 threads took 451 ms 5 threads took 559 ms 6 threads took 655 ms 7 threads took 763 ms 8 threads took 908 ms 9 threads took 1015 ms ... 31 threads took 3176 ms