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Subject: Re: [boost] Interest in B-tree library for Boost?
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2010-09-16 07:19:27

Ion Gaztañaga wrote:
> El 16/09/2010 3:08, Beman Dawes escribió:
> >> - Can this be adapted for in-memory use as well, with full
> >> non-POD support?
> >
> > No current plans for that. Why wouldn't you just a standard library
> > associative container for that?
> I think it's about performance/node overhead (less rebalances, you
> allocate arrays and not individual nodes). But for memory,
> T-Trees are
> the way to go. They are used by many in-memory DBs.
> "In computer science a T-tree is a type of binary tree data structure
> that is used by main-memory databases, such as Datablitz, eXtremeDB,
> MySQL Cluster, Oracle TimesTen and KairosMobileLite"

In the same article, however, one reads:

"Although T-trees seem to be widely used for main-memory databases, recent research indicates that they actually do not perform better than B-trees on modern hardware."

Followed by links to research to justify the claim.

Then, again, there's the recent thread on Judy arrays to consider, too.

Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP

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