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From Andi Vajda <a...@osafoundation.org>
Subject Re: lucene 1.3 RC3 compiled with gcj
Date Wed, 03 Dec 2003 17:59:35 GMT

Yes, my sample was pitifully small last night. I intend to do another test
today with larger files. Using the JDK docs is great idea.

Andi..

On Wed, 3 Dec 2003, Doug Cutting wrote:

> Andi,
>
> I think these numbers could still easily be dominated by class loading.
>   Java classes are loaded on demand, and there are many classes which
> are probably loaded after the IndexFiles demo records the start time.
> I'd guess that there is no class loading with gcj.  It would be better
> to use a benchmark that takes at least 10-20 seconds.  For example, try
> using IndexFiles or IndexHTML on the JDK documentation.
>
> Cheers,
>
> Doug
>
> Andi Vajda wrote:
> > The numbers are the ones that are displayed by the lucene
> > org.apache.lucene.demo.IndexFiles demo, I assume the clock is started after
> > the VM has loaded.
> >
> > Andi..
> >
> > On Wed, 3 Dec 2003, Dmitry Serebrennikov wrote:
> >
> >
> >>Andi Vajda wrote:
> >>
> >>
> >>>I got the latest lucene to compile and run its demo on Linux (redhat 9) and
> >>>Mac OS X Panther 10.3.1 using gcc 3.3.2's gcj, compiling to native
> >>>executables.
> >>>
> >>>The demo seems to run. I didn't run the unittests since I didn't attempt
to
> >>>compile junit with gcj yet.
> >>>
> >>>Performance seems way faster than the java VM version but somewhat slower
than
> >>>clucene's C++ port of lucene, indexing a small set of files. I say somewhat
as
> >>>my set is not that large and my measurements not very thorough, but here
are
> >>>some numbers for indexing 116k of text in 14 files, as measured on a Powerbook
> >>>1Ghz/1GB running Mac OS X Panther 10.3.1:
> >>>
> >>> lucene 1.3 RC3 with java 1.4.1: 1169 ms
> >>> lucene 1.3 RC3 with gcj       :  467 ms
> >>> clucene 0.8.9                 :  365 ms
> >>>
> >>
> >>This is very interesting! I didn't even know about the clucene project,
> >>but now I'll definetely have to take a look! I was beginning to think
> >>about doing this myself, but if the code already exists - so much the
> >>better. gcj sounds great too.
> >>Are these times for pure indexing, or is this a time for the program to
> >>run. If so, the extra 1 second could just be due to the VM startup
> >>time... The numbers would be much less impressive if that was the case.
> >>Also, if you have numbers for a larger dataset, please post them here. I
> >>am very interested in these results, and I think many others might be also.
> >>
> >>Thanks.
> >>Dmitry.
> >>
> >>
> >>
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> >
> >
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