Anthony Green wrote:
On Wed, 2005-05-11 at 13:10 -0500, Archie Cobbs wrote:
Those are good points.. I'm not saying JIT is bad, I'm just saying
WAT has a place and can sometimes do things that JITs cannot because
of time constraints.
Yes - in the real world, JITs don't always necessarily win.
Here's an example. Wikipedia is currently using a gcj-built version of
Lucene to power their search feature. Here's some text describing a
benchmark that help them make this decision:
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Crude, simple benchmark; does single-word fulltext search for “pope” 100
times sequentially. This is a fairly popular word, and returns 6890
results from the test database used (English Wikipedia, 2005-03-09
dump). Time returned is the average time spent for a request on the
client, over the second set of 100 runs.
GCJ 4.0 -O2: 588.3437 ms (fastest)
Sun Java 1.5 -server: 636.9209 ms
Sun Java 1.5: 695.5374 ms
GCJ 4.0: 707.2302 ms
Mono 1.1.6: 894.4488 ms (slowest)
Each version of the daemon read from the same index set, which I had
generated with the Mono-based version. (dotlucene 1.4 is index-
compatible with the Java Lucene 1.4.)
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I'm fairly certain we can do much better with additional compiler
options (-march=pentium4 and the like).
In any case, this is a showcase app for Apache + FSF technology working
together in an important real-world application.
Awesome! we should make a PR out of this!
--
Stefano.
