| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Matthew Kirkwood <matthew(at)hairy(dot)beasts(dot)org> |
| Cc: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: mmap for zeroing WAL log |
| Date: | 2001-02-27 22:25:03 |
| Message-ID: | 13140.983312703@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-patches |
Matthew Kirkwood <matthew(at)hairy(dot)beasts(dot)org> 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
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