On Tue, 2012-03-13 at 09:42 +0100, Andres Freund wrote:
> for recursively everything in dir:
> posix_fadvise(fd, POSIX_FADV_DONTNEED);
>
> for recursively everything in dir:
> fsync(fd);
Wow, that made a huge difference!
no sync: ~ 1.0s
sync: ~10.0s
fadvise+sync: ~ 1.3s
Patch attached.
Now I feel much better about it. Most people will either have fadvise, a
write cache (rightly or wrongly), or actually need the sync. Those that
have none of those can use -N.
Regards,
Jeff Davis
