* Andres Freund (and...@2ndquadrant.com) wrote: > > Note that if we somehow come up with a page replacement algorithm that tends > > to evict pages that are in the OS cache, we have effectively solved the > > double buffering problem. When a page is cached in both caches, evicting it > > from one of them eliminates the double buffering. Granted, you might prefer > > to evict it from the OS cache instead, and such an algorithm could be bad in > > other ways. But if a page replacement algorithm happens avoid double > > buffering, that's a genuine merit for that algorithm. > > I don't think it's a good idea to try to synchronize algorithms with the > OSs. There's so much change about the caching logic in e.g. linux that > it won't stay effective for very long.
There's also more than one OS...
Thanks,
Stephen
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