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http://issues.apache.org/jira/browse/LUCENE-675?page=comments#action_12436972 ]
Dawid Weiss commented on LUCENE-675:
------------------------------------
First -- I think it's a good initiative. Grant, when you're thinking about the
infrastructure, it would be pretty neat to have a way of logging performance in
a way so that one could draw charts from them. You know, for the visual folks :)
Anyway, my other idea is that benchmarking Lucene can be performed on two
levels: one is the user level, where the entire operation counts (such as
indexing, searching etc). Another aspect is measurement of atomic parts
_within_ the big operation so that you know how much of the whole thing each
subpart takes. I wrote an interesting piece of code once that allows measuring
times for named operation (per-thread) in a recursive way. Looks something like
this:
perfLogger.start("indexing");
try {
.. code (with recursion etc) ...
perfLogger.start("subpart");
try {
} finally {
perfLogger.stop();
}
} finally {
perfLogger.stop();
}
in the output you get something like this:
indexing: 5 seconds;
->subpart: : 2 seconds;
-> ...
Of course everything comes at a price and the above logging costs some CPU
cycles (my implementation stored a nesting stack in ThreadLocals).
One can always put that code in 'if' clauses attached to final variables and
enable logging only for benchmarking targets (the compiler will get rid of
logging statements then).
If folks are interested I can dig out that performance logger and maybe adopt
it to what Grant comes up with.
> Lucene benchmark: objective performance test for Lucene
> -------------------------------------------------------
>
> Key: LUCENE-675
> URL: http://issues.apache.org/jira/browse/LUCENE-675
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Andrzej Bialecki
> Assigned To: Grant Ingersoll
> Attachments: LuceneBenchmark.java
>
>
> We need an objective way to measure the performance of Lucene, both indexing
> and querying, on a known corpus. This issue is intended to collect comments
> and patches implementing a suite of such benchmarking tests.
> Regarding the corpus: one of the widely used and freely available corpora is
> the original Reuters collection, available from
> http://www-2.cs.cmu.edu/afs/cs.cmu.edu/project/theo-20/www/data/news20.tar.gz
> or
> http://people.csail.mit.edu/u/j/jrennie/public_html/20Newsgroups/20news-18828.tar.gz.
> I propose to use this corpus as a base for benchmarks. The benchmarking
> suite could automatically retrieve it from known locations, and cache it
> locally.
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