Re: Cache and Store

On 5/9/07, Matthew Toseland <toad-EI5O+8PHWbJeeLb3ft/[email protected]> wrote:
> On Wednesday 09 May 2007 20:28, Bob Ham wrote:
> > On Wed, 2007-05-09 at 12:03 +0100, Michael Rogers wrote:
> > > Would it be possible to dynamically balance the amount of space
> > > allocated to the cache and store? Here's what I have in mind: when the
> > > cache is below its quota and a key is cached, remove the least recently
> > > used key from the store instead of the cache. And vice versa: when the
> > > store is below its quota and a key is stored, remove the least recently
> > > used key from the cache.
> >
> > That was what I proposed near the start of this thread.  I would note,
> > as well, that the store-shrinking code should already exist for cases
> > when the user reduces the configured size of the store.
> >
> > Bob
>
> It does, but as I have already stated at least once, it is difficult to
> efficiently do an online shrink while preserving the most recently used data.
>
> It is of course possible. One way to do it is to swap the key you'd be
> deleting with the least recently used key just before truncating.
>
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>

This is not exactly what you are looking for but I am 90% finished
coding a config option to have the store and the cache be non-equal
and user configurable in size.  This could be changed manually as
often as you wished as your store filled up.

I was going to run it by the list after I had completed it.

This was something that I wanted to see if I could figure out how to
do (whether or not it gets merged into the codebase.)

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