Re: [pgsql-hackers-win32] win32 performance - fsync question

The default should clearly be the safest method.

Personally, I would disable anything but the safest method for all
database files that are not read-only.

IMO-YMMV.
-----Original Message-----
From: pgsql-hackers-owner(at)postgresql(dot)org
[mailto:pgsql-hackers-owner(at)postgresql(dot)org] On Behalf Of Bruce Momjian
Sent: Thursday, March 17, 2005 10:53 AM
To: Tom Lane
Cc: Magnus Hagander; Michael Paesold; pgsql-hackers(at)postgresql(dot)org;
pgsql-hackers-win32(at)postgresql(dot)org; Merlin Moncure
Subject: Re: [pgsql-hackers-win32] [HACKERS] win32 performance - fsync
question

Tom Lane wrote:
> Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> > However, I do prefer this patch and let Win32 have the same write
cache
> > issues as Unix, for consistency.
>
> I agree that the open flag is more nearly O_DSYNC than O_SYNC.
>
> ISTM Windows' idea of fsync is quite different from Unix's and
therefore
> we should name the wal_sync_method that invokes it something different
> than fsync. "write_through" or some such? We already have precedent
> that not all wal_sync_method values are available on all platforms.
>
> I'm not taking a position on which the default should be ...

Yes, I am thinking that too. I hesistated because it adds yet another
sync method, and we have to document it works only on Win32, but I see
no better solution.

I am going to let the Win32 users mostly vote on what the default should
be.

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania
19073

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