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Re: Win32 Powerfail testing

From: Kevin Brown <kevin(at)sysexperts(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Win32 Powerfail testing
Date: 2003-03-06 04:37:03
Message-ID: 20030306043703.GT1833@filer (view raw or flat)
Thread:
Lists: pgsql-hackers
Tatsuo Ishii wrote:
> Sorry, but it does not help. The page says we could use
> FlushFileBuffers() to sync the kernel buffer to the
> disk. Unfortunately, it requires a file descriptor to flush for its
> argument. Thus it could not be a replacement of sync(). Actually I
> have modified the buffer manager so that it remembers all file
> descriptors those have not been synced yet to the disk at the
> checkpoint time to sync them later. However I found this modification
> does not help at all with some reason I don't know.

It would be an interesting comparison for you to roll the file
descriptor tracking changes into the Unix side of the tree and use
fsync() or fdatasync() in place of FlushFileBuffers() on the Unix side
(you'd have to remove or disable the code that does a sync() of
course).  If the end result yields no data corruption issues during
powerfail testing on various Unix platforms then it's reasonably
likely that the problem you're experiencing on the Windows side is
with the underlying Windows platform and not with your code.



-- 
Kevin Brown					      kevin(at)sysexperts(dot)com

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