http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50016
--- Comment #7 from PcX <xunxun1982 at gmail dot com> 2011-08-08 12:05:47 UTC --- (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?
