[ZODB-Dev] Re: ZODB Benchmarks

[David Binger]

On Nov 2, 2007, at 5:48 AM, Lennart Regebro wrote:

> On 11/1/07, Matt Hamilton <matth at netsight.co.uk> wrote:
>> An interesting idea.  Surely we need the opposite though, and that  
>> is an
>> additional BTree with a very large bucket size, as we want to  
>> minimize the
>> chance of a bucket split when inserting?  Then we occasionally  
>> consolidate and
>> move the items in the original BTree with the regular bucket size/ 
>> branch factor.
>
> Would it be possible to not "occasionally" consolidate, but actually
> do it ongoing, but just one process, thereby always inserting just one
> transaction into the normal BTree at a time? Or does that cause
> troubles?

I think that option would work.  I think it would suffice to do a
"Big.update(Small); Small.clear()" operation before a nightly pack.
It might invalidate every bucket in every cache, but BTrees are
designed to perform reasonably without a cache.







-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.zope.org/pipermail/zodb-dev/attachments/20071102/4131df94/attachment.htm