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Speed up CREATE DATABASE by deferring the fsyncs until after copying

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all the data and using posix_fadvise to nudge the OS into flushing it
earlier. This also hopefully makes CREATE DATABASE avoid spamming the
cache.

Tests show a big speedup on Linux at least on some filesystems.

Idea and patch from Andres Freund.
This commit is contained in:
Greg Stark
2010-02-15 00:50:57 +00:00
parent e26c539e9f
commit f8c183a1ac
3 changed files with 76 additions and 29 deletions
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18
src/backend/storage/file/fd.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/file/fd.c,v 1.153 2010/01/12 02:42:52 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/file/fd.c,v 1.154 2010/02/15 00:50:57 stark Exp $
*
* NOTES:
*
@ -319,6 +319,22 @@ pg_fdatasync(int fd)
return 0;
}
/*
* pg_flush_data --- advise OS that the data described won't be needed soon
*
* Not all platforms have posix_fadvise; treat as noop if not available.
*/
int
pg_flush_data(int fd, off_t offset, off_t amount)
{
#if defined(USE_POSIX_FADVISE) && defined(POSIX_FADV_DONTNEED)
return posix_fadvise(fd, offset, amount, POSIX_FADV_DONTNEED);
#else
return 0;
#endif
}
/*
* InitFileAccess --- initialize this module during backend startup
*