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From: "tkoenig at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/38654] Fortran I/O speedup
Date: Mon, 29 Dec 2008 12:26:00 -0000	[thread overview]
Message-ID: <20081229122453.9840.qmail@sourceware.org> (raw)
In-Reply-To: <bug-38654-10391@http.gcc.gnu.org/bugzilla/>



------- Comment #5 from tkoenig at gcc dot gnu dot org  2008-12-29 12:24 -------
Some simple test cases:

$ cat write-dollar.f
      program main
      do i=1,10**6
         write (10,fmt='(A$)') 'a'
      end do
      end
$ g77-3.4 -O write-dollar.f && time ./a.out

real    0m3.356s
user    0m1.068s
sys     0m2.280s
$ gfortran -O write-dollar.f && time ./a.out

real    0m12.198s
user    0m2.172s
sys     0m10.009s

$ gfortran -O write-advance.f && time ./a.out

real    0m10.737s
user    0m2.828s
sys     0m7.292s
$ ifort write-advance.f && time ./a.out

real    0m0.488s
user    0m0.480s
sys     0m0.008s


-- 

tkoenig at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2008-12-29 12:24:52
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38654


  parent reply	other threads:[~2008-12-29 12:26 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-28 17:12 [Bug libfortran/38654] New: " tkoenig at gcc dot gnu dot org
2008-12-28 17:39 ` [Bug libfortran/38654] " domob at gcc dot gnu dot org
2008-12-28 20:56 ` jvdelisle at gcc dot gnu dot org
2008-12-28 21:03 ` jvdelisle at gcc dot gnu dot org
2008-12-28 21:28 ` domob at gcc dot gnu dot org
2008-12-29 12:26 ` tkoenig at gcc dot gnu dot org [this message]
2009-03-29 19:50 ` domob at gcc dot gnu dot org
2009-04-05 20:14 ` jvdelisle at gcc dot gnu dot org
2009-04-05 20:23 ` jvdelisle at gcc dot gnu dot org
2009-05-27  1:23 ` jvdelisle at gcc dot gnu dot org
2009-06-09  3:22 ` jvdelisle at gcc dot gnu dot org
     [not found] <bug-38654-4@http.gcc.gnu.org/bugzilla/>
2021-12-26  5:51 ` pinskia at gcc dot gnu.org

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