http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50016
--- Comment #8 from PcX <xunxun1982 at gmail dot com> 2011-08-08 12:35:12 UTC --- (In reply to comment #7) > (In reply to comment #6) > > Maybe this is MingW specific? > > > > I haven't tested this, but here goes my guess: > > > > Since in the write loop we're jumping back and forth across the file, the > > buffer must be frequently flushed; in libgfortran/io/unix.c (buf_flush) we > > have > > in the trunk and 4.6 branch: > > > > #ifdef _WIN32 > > _commit (s->fd); > > #endif > > > > If this is some kind of win32 equivalent to fsync(), i.e. commit stuff to > > disk, > > then it's no surprise it's slow? > > > > This code was added to buf_flush() as a response to > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44698 . > > That sounds reasonable. > So this bug is fixed in the trunk, but haven't been backported to 4.6? Sorry, I'm wrong. I think I can try 4.7 to test this.
