[ZODB-Dev] cache-size-bytes usable?

[Andreas Jung]

Am 07.11.09 18:25, schrieb Hanno Schlichting:
> Hi.
>
> I've been playing around with the new "cache-size-bytes" setting to
> limit the ZODB cache sizes.
>
> My ZODB 3.9.3 (Zope 2.12 / Plone) config had a setting of
> cache-size-bytes to 128mb and a cache-size of one million (to
> effectively disable the object number based checks). This was without
> ZEO, a simple FileStorage with a blobstorage enabled.
>
> When using and testing this for a while in a setup with two database
> connection threads, things worked fine for a while, but after 10 to 15
> minutes of various load patterns things broke down. Both connections
> started to minimize their connection cache down to zero objects
> continuously.
>
> It looks like the active cache size isn't properly reduced at some
> point and as a result the cache thinks it is already using the maximum
> amount.
>
> Has anyone used the bytes limited cache in production yet and has any
> experience with it?
>
> I can try to isolate the problem some more. Playing around I did
> everything from loading objects, packing the database, minimizing
> caches, so it's hard to know what might cause this.

I would assume that this feature is working since it comes
from the Haufe Zope fork afaik and likely we are using it in production.
But I have to check this by digging through the legacy of the
origin author.

Andreas
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