[Bug libfortran/33985] access="stream",form="unformatted" doesn't buffer

[jvdelisle at gcc dot gnu dot org]

------- Comment #26 from jvdelisle at gcc dot gnu dot org  2007-12-02 18:55 
-------
With this test case:

program main
  implicit none
  integer :: i, j
  open(95,form="unformatted",access="stream")
  do j=1, 125000
  do i=0,255
    write(95) int(i,kind=1)
  end do
  end do
end program main

gfortran 4.3 with patch

$ gfc pr33985.f90 
$ time ./a.out

real    0m5.823s
user    0m5.781s
sys     0m0.029s

gfortran 4.2 no patch

$ gfc42 -static pr33985.f90 
$ time ./a.out

real    1m8.781s
user    0m10.334s
sys     0m58.446s

Thats an 11.8 X improvement.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33985