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From John Wang <john.w...@gmail.com>
Subject Re: HPPC: High Performance Primitive Collections for Java
Date Wed, 21 Apr 2010 08:10:25 GMT
Hi Dawid:

     Any performance comparisons with fastutil?

Thanks

-John

On Mon, Apr 19, 2010 at 1:11 PM, Dawid Weiss <dawid.weiss@gmail.com> wrote:

> > Hmmm.. can anybody compare these to fastutil?
>
> I believe I can answer some of your questions.
>
> 1) HPPC is not directly Java Collections-compatible. It does have
> interface hierarchy, but it's not a descendant of the familiar Set,
> Map or List. Fastutil is collections-compatible.
>
> 2) HPPC has open internals, so you can do anything you like once your
> collections are created, including manipulation of internal storage
> arrays, for instance. This was a design decision and goal. As with any
> sharp objects, improper use may cause harm.
>
> 3) HPPC uses assert instead of fixed condition checks. There are no
> attempts to detect misuse (fail-fast iterators, etc.).
>
> 4) fastutil is more mature, has support for more data structures
> (sorted trees, etc.) and was written by an excellent programmer
> (Sebastiano Vigna). HPPC was created internally for use at Carrot
> Search and was primarily motivated by speed; we believed that in
> certain applications direct access to collections' internals should be
> allowed and should be beneficial. Our micro-benchmarks show that this
> is largerly true if you manipulate LOTS of data. For smaller data sets
> even built-in Java collections with boxed types do surprisingly well
> (due to HotSpot optimizations too).
>
> 5) There are subtle differences in how HPPC is written -- I use pretty
> much normal generic classes with some pseudo-intrinsics and
> regexp-substituted comments. Sebastiano uses C++ preprocessor to
> generate Java classes from templates (yes, wicked).
>
> I look at Lucene and SOLR source code and learn a LOT from folks
> contributing to this project, so HPPC will be hardly any faster or
> better compared to what Lucene already has, but if anybody find
> anything from HPPC useful, please take handfuls. I would love for this
> project to be finally merged with Mahout, but I intentially left it in
> Carrot Search labs for a little while so that the API can stabilize
> (through our in-house experiments mostly).
>
> Thanks for showing your interest!
> Dawid
>
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