On Tue, May 14, 2013 at 9:43 PM, Robert Haas <robertmh...@gmail.com> wrote: > On Mon, May 13, 2013 at 9:54 PM, Jon Nelson <jnelson+pg...@jamponi.net> wrote: >> Pertinent to another thread titled >> [HACKERS] corrupt pages detected by enabling checksums >> I hope to explore the possibility of using fallocate (or >> posix_fallocate) for new WAL file creation. >> >> Most modern Linux filesystems support fast fallocate/posix_fallocate, >> reducing extent fragmentation (where extents are used) and frequently >> offering a pretty significant speed improvement. In my tests, using >> posix_fallocate (followed by pg_fsync) is at least 28 times quicker >> than using the current method (which writes zeroes followed by >> pg_fsync). >> >> I have written up a patch to use posix_fallocate in new WAL file >> creation, including configuration by way of a GUC variable, but I've >> not contributed to the PostgreSQL project before. Therefore, I'm >> fairly certain the patch is not formatted properly or conforms to the >> appropriate style guides. Currently, the patch is based on 9.2, and is >> quite small in size - 3.6KiB.
I have re-based and reformatted the code, and basic testing shows a reduction in WAL-file creation time of a fairly significant amount. I ran 'make test' and did additional local testing without issue. Therefore, I am attaching the patch. I will try to add it to the commitfest page. -- Jon
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