Re: A patch for xlog.c

Matthew Kirkwood <matthew@hairy.beasts.org> writes:
> Here is a patch against 7.1beta5 to use mmap(), and thus a
> single write, to initialise xlogs.  It may well improve
> performance of this on platforms/filesystems which write
> metadata synchronously.

Have you *demonstrated* any actual performance improvement from this?
How much?  On what platforms?

I don't believe in adding unportable alternative implementations without
pretty darn compelling reasons ...

            regards, tom lane