From: | Kevin Brown <kevin(at)sysexperts(dot)com> |
---|---|
To: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: [pgsql-hackers-win32] Sync vs. fsync during checkpoint |
Date: | 2004-02-08 21:54:51 |
Message-ID: | 20040208215450.GI2608@filer |
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Lists: | pgsql-hackers |
Merlin Moncure wrote:
> Kevin Brown wrote:
>
> > I have no idea whether or not this approach would work in Windows.
>
> The win32 API has ReadFileScatter/WriteFileScatter, which was developed
> to handle these types of problems. These two functions were added for
> the sole purpose of making SQL server run faster. They are always
> asynchronous and are very efficient. Perhaps the win32 port could just
> deal with the synchronization with an eye for future optimizations down
> the line?
The problem with the approach I described on win32 is that fast fork()s
are required for it to not significantly impact the running backends.
That is, fork() has to return quickly when called. I don't know whether
the implementation of fork() under win32 would be fast enough for
this purpose. It might be -- I don't have any experience with fork()
on win32 platforms so I can't say.
--
Kevin Brown kevin(at)sysexperts(dot)com
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