[HACKERS] Re: mmap for zeroing WAL log

[Tom Lane]

Matthew Kirkwood <[EMAIL PROTECTED]> writes:
> I had assumed that the overhead would come from synchronous
> metadata incurring writes of at least the inode, block bitmap
> and probably an indirect block for each syscall.

No Unix that I've ever heard of forces metadata to disk after each
"write" call; anyone who tried it would have abysmal performance.
That's what fsync and the syncer daemon are for.

                        regards, tom lane