Re: Adjust Memoize hit_ratio calculation

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От David Rowley
Тема Re: Adjust Memoize hit_ratio calculation
Дата
Msg-id CAApHDvqOm_ANNwXdJQFSA2g_tszgDeWGJ+_M3FiyUzN9XnEutw@mail.gmail.com
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Ответ на Adjust Memoize hit_ratio calculation  (David Rowley <dgrowleyml@gmail.com>)
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On Tue, 21 Mar 2023 at 09:41, David Rowley <dgrowleyml@gmail.com> wrote:
> Because that's being changed in v16, I think it might also be a good
> idea to fix the hit_ratio calculation problem reported by David
> Johnston in [1].  In the attached, I've adjusted David's calculation
> slightly so that we divide by Max(ndistinct, est_cache_entries)
> instead of ndistinct.  This saves from overestimating when ndistinct
> is smaller than est_cache_entries.  I'd rather fix this now for v16
> than wait until v17 and further adjust the Memoize costing.

I've now pushed this change.

David



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