Re: JVM performance on Linux (vs. Solaris/Windows)

["Martin J. Bligh" <mbligh@mbligh.org>]

K P wrote:

> Sun's recently published SPECjbb_2005 numbers on Linux, Windows and
> Solaris on their
> Opteron system, and the Linux result is the lowest of the three by far:
>
> Linux: http://www.spec.org/jbb2005/results/res2006q1/jbb2005-20060117-00062.html
> Solaris: http://www.spec.org/jbb2005/results/res2006q1/jbb2005-20060117-00063.html
> Windows: http://www.spec.org/jbb2005/results/res2006q1/jbb2005-20060117-00064.html
>
> It's not evident if Sun spent any time analyzing and tuning the Linux
> result. While the
> majority of the tuning opportunities for SPECjbb_2005 are likely to be
> in the JVM itself, I was
> wondering (given the large spread between the OS's) if there were
> other typical opportunities
> to tune the Linux kernel for JVM performance and SPECjbb_2005.
>
> There are some other results showing excellent scalability with SPECjbb_2005 on
> Linux/Itanium (such as SGI's:
> http://www.spec.org/jbb2005/results/res2006q2/ ), but it's
> not clear if there are other opportunities for tuning unique to Linux
> on Opteron, or Linux
> in general that should be explored
>
> Comments?
>  

SpecJBB is a really frigging stupid benchmark. It's *much* more affected
by the stupid crap in Java (like their locking model) than anything in the
OS. 

Best to find another benchmark, oh and preferably somebody vaguely
objective to run it ;-)

M.

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