Re: FATAL: invalid value for parameter "wal_sync_method":

Francesco Dalla Ca' wrote:
> This mean that method isn't supported by postgres on my platform?
> Must i give some extra options at build time?
> (i use postgresql 8.0.2 sources)
>
> The test "syncbench" that i run on this server with the "open(O_DSYNC)"
> method, give me results without problems.

Here is our test code for 8.0.2:

#if defined(O_SYNC)
#define OPEN_SYNC_FLAG O_SYNC
#else
#if defined(O_FSYNC)
#define OPEN_SYNC_FLAG O_FSYNC
#endif
#endif

#if defined(O_DSYNC)
#if defined(OPEN_SYNC_FLAG)
#if O_DSYNC != OPEN_SYNC_FLAG
#define OPEN_DATASYNC_FLAG O_DSYNC
#endif
#else /* !defined(OPEN_SYNC_FLAG) */
/* Win32 only has O_DSYNC */
#define OPEN_DATASYNC_FLAG O_DSYNC
#endif
#endif

Is your O_DSYNC the same #define value as O_SYNC or if that isn't
defined, O_FSYNC? If so, you don't really have O_DSYNC as unique from
O_SYNC, and we will not support "open_datasync".

---------------------------------------------------------------------------

>
> Thanks and best regards.
>
>
> Scott Marlowe wrote:
>
> >On Thu, 2005-06-16 at 09:35, Francesco Dalla Ca' wrote:
> >
> >
> >>O.S.:
> >>SuSE SLES-8 (i386)
> >>VERSION = 8.1
> >>
> >>After some test with the "syncbench" posted on performance mailing-list
> >>(http://archives.postgresql.org/pgsql-performance/2004-09/msg00080.php)
> >>i have obtained that open() with O_DSYNC was the fastest sync method.
> >>I want to test this for parameter "wal_sync_method" on a test workload
> >>directly on Postgres and i have configured that on postgresql.conf file:
> >>
> >>wal_sync_method = open_datasync
> >>
> >>But at the server start:
> >>
> >> > pg_ctl -D /db10/postgres/data start
> >>postmaster starting
> >> > FATAL: invalid value for parameter "wal_sync_method": "open_datasync"
> >>
> >>What's wrong?
> >>
> >>
> >
> >Not all methods are supported on all platforms. It appears this one
> >isn't supported on yours.
> >
> >
> >
>
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>

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