Re: Decrease JIT time

On 9/11/07, Jeff Kesselman <[email protected]> wrote:
> Rodrick Brown wrote:
> > I found the following JVM tunable from IBM for os400 I was wondering
> > if there was a similar optiomization that can be used on Linux x64
> > hosts I'm running  Sun JDK 6 update 2.
> >
> > Using the Just-In-Time (JIT) compiler with the Mixed-Mode Interpreter
> > (MMI) results in startup performance that almost equals that of compiled
> > code. MMI interprets your Java code until reaching the threshold
> > specified by the os400.jit.mmi.threshold Java system property. After
> > reaching the threshold, OS/400 spends the time and resources required to
> > use the JIT compiler to compile a method on the most frequently used
> > methods. Using the JIT compiler results in highly optimized code that
> > improves runtime performance when compared to precompiled code. When you
> > require improved startup performance with the JIT compiler, you can use
> > CRTJVAPGM to create an optimized Java program object.
> >
> > Thanks.
> >
> > ---------- Forwarded message ----------
> > From: Brown, Rodrick <[email protected]>
> > Date: Sep 11, 2007 9:34 AM
> > Subject: JIT optimization
> > To: [email protected]
> >
> >
> >
> > Using the Just-In-Time (JIT) compiler with the Mixed-Mode Interpreter
> > (MMI) results in startup performance that almost equals that of compiled
> > code. MMI interprets your Java code until reaching the threshold
> >
>
> Yes.
>
> Its called the HotspotVM from Sun  and has been for many years now 8)
>
Sorry I actually referring to a specific  JIT property called
"os400.jit.mmi.threshold" not a HotspotVM sorry for not being clear.

> There are  numerous tuning parameters on the Hotspot VM inlcuding eden
> space, compile
> threshold, and so on.  Id search sun.com for articles on tuning
> hotspot.  I know there have been
> a number.
>
> Regards
>
> JK
>
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--
Rodrick R. Brown
http://www.rodrickbrown.com

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