TSearch2 vs. Apache Lucene

Greetings all,

I'm going to do a performance comparison with DocMgr and PG81/TSearch2 on
one end, and Apache Lucene on the other end.

In order to do this, I'm going to create a derivative of the
docmgr-autoimport script so that I can specify one file to import at a
time.  I'll then create a Perl script which logs all details (such as
timing, etc.) as the test progresses.

As test data, I have approximately 9,000 text files from Project Gutenberg
ranging in size from a few hundred bytes to 4.5M.

I plan to test the speed of import of each file.  Then, I plan to write a
web-robot in Perl that will test the speed and number of results returned.

Can anyone think of a validation of this test, or how I should configure
PG to maximise import and search speed?  Can I maximise search speed and
import speed, or are those things mutually exclusive?  (Note that this
will be run on limited hardware - 900MHz Athlon with 512M of ram)

Has anyone ever compared TSearch2 to Lucene, as far as performance is
concerned?

Thanks,
-Josh