Mailing List Archive

Winton,

I'm not sure that javac -O actually does anything. From the 1.3 tool
documentation:

"Note: the -O option does nothing in the current implementation of javac
and oldjavac."

In fact, the JDK 1.4 tool documentation doesn't even mention the -O
option (even though "javac -help" still lists the option).

In regards to your earlier email about JVM optimization -- you may want
to check out the Jrockit JVM if you have a chance. I haven't used it
yet, but the features sound interesting for server-side Java
performance. http://www.jrockit.com

Regards,
Matt

> -----Original Message-----
> From: Winton Davies [mailto:wdavies@overture.com]
> Sent: Wednesday, November 28, 2001 4:51 PM
> To: Lucene Users List
> Subject: javac -O ?
>
>
> Hi,
>
> Is the nightly build compiled Optimized ? if not, has anyone ever
> tried compiling Optimized, and using that ? Does it help improve
> performance ? It would seem to me that given the compute intensive
> nature of querying, that even slightly improved compilations would
> speed things up ?
>
> Cheers,
> Winton
>
> Winton Davies
> Lead Engineer, Overture (NSDQ: OVER)
> 1820 Gateway Drive, Suite 360
> San Mateo, CA 94404
> work: (650) 403-2259
> cell: (650) 867-1598
> http://www.overture.com/
>
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Hi Matt,

Thanks!! :-)

Pointers for Rockit look interesting. I'm having some degree of
success with JVM 1.3.1_.10 from Sun -- I think there is a trick to
get the tenuring stuff to work right, just a matter of finding the
right balance of Eden/Old/Survivor space...

Cheers,
Winton

Winton Davies
Lead Engineer, Overture (NSDQ: OVER)
1820 Gateway Drive, Suite 360
San Mateo, CA 94404
work: (650) 403-2259
cell: (650) 867-1598
http://www.overture.com/

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