From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 20940 invoked by alias); 17 Apr 2013 00:58:07 -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 20882 invoked by uid 48); 17 Apr 2013 00:58:03 -0000 From: "jvdelisle at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug fortran/56981] Slow I/O: Unformatted 5x slower, large sys component; formatted slow as well Date: Wed, 17 Apr 2013 00:58:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: fortran X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: jvdelisle at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED 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 X-SW-Source: 2013-04/txt/msg01575.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56981 --- Comment #2 from Jerry DeLisle 2013-04-17 00:58:02 UTC --- There is a seek inside next_record_w_unf. That function is used for DIRECT I/O. Looks conceptually wrong to me for sequential unformatted. I won't have time for a few days to look at this further.