On 7/13/2021 2:30 PM, Mike Drob wrote:
One option that I've thought about is if instead of inserting results
into the cache directly, we pre-register a future in the cache, and
then use that as a reference to the results. Multiple queries coming
in parallel would all wait for the same result calculation instead of
allocating large arrays each.
That's a really interesting idea. Sounds like a very good optimization.
As always the devil is in the details ... properly handling all the
possible corner cases. I worry that it's going to be a harder problem
to solve than we think it is ... but I am not going to let that stand in
the way of making the attempt.
When I first dreamed up LFUCache, I didn't think I was going to be able
to write it. But I decided to make the attempt anyway, and I think it
was Hoss that committed it -- this was before I was asked to join the
project. Even though it's been obsoleted by the Caffeine version, I
really enjoyed working on it.
Thanks,
Shawn
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