Re: java -server jvm option:

Subject: Re: java -server jvm option:
From: Charles Ditzel <email@hidden>
Date: Fri, 04 Dec 2009 06:26:46 -0800
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Ted's email nudged me out of sleep at 4:30 am...

I did a quick test with Tomcat and a simple servlet ... and here are some quick results on an Intel MacBook Pro (2.4 Ghz Core 2 Duo) and an Windows 7 boxes.

Hope this provides a datapoint to those who are curious.

Test : -server option (what it resolves to) :
================================

[MacOS 10.5.8  JavaVM : 1.5.0_20]
 -XX:MaxHeapSize=134217728 -XX:+PrintCommandLineFlags

[MacOS 10.5.8 JavaM : 1.6.0_17] -XX:CompileThreshold=10000 -XX:MaxHeapSize=1073741824 - XX:ParallelGCThreads=2 -XX:+PrintCommandLineFlags -XX:+UseParallelGC

[Windows 7 (32 bit) - JavaVM: 1.6.0_17] -XX:MaxHeapSize=536870911 -XX:ParallelGCThreads=2 -XX: +PrintCommandLineFlags -XX:-UseLargePagesIndividualAllocation -XX: +UseParallelGC

[Windows 7 (64 bit) - JavaVM: 1.6.0_17] -XX:MaxHeapSize=939309056 -XX:ParallelGCThreads=2 -XX: +PrintCommandLineFlags -XX:-UseLargePagesIndividualAllocation -XX: +UseParallelGC

Test : -server XX:+AggressiveHeap -XX:+AggressiveOpts -XX: +PrintCommandLineFlags =====================================================================

[MacOS 10.5.8 JavaVM: 1.5_0_20] -XX:+AggressiveOpts -XX:BaseFootPrintEstimate=134217728 -XX: +BindGCTaskThreadsToCPUs -XX:CompilationPolicyChoice=0 -XX:MaxHeapSize=134217728 -XX:MaxNewSize=50331648 -XX:NewSize=50331648 -XX:OldPLABSize=8192 -XX:ParallelGCThreads=2 -XX:+PrintCommandLineFlags -XX:-ResizeTLAB -XX:-ScavengeBeforeFullGC - XX:TLABSize=262144 -XX:ThresholdTolerance=100 -XX:+UseParallelGC -XX:YoungPLABSize=262144

[MacOS 10.5.8 Java_VM: 1.6.0_17] XX:+AggressiveOpts -XX:BaseFootPrintEstimate=2060242128 -XX: +BindGCTaskThreadsToCPUs -XX:CompilationPolicyChoice=0 -XX:CompileThreshold=10000 -XX:MaxHeapSize=2060242128 - XX:MaxNewSize=772590798 -XX:NewSize=772590798 -XX:OldPLABSize=8192 -XX:ParallelGCThreads=2 -XX:+PrintCommandLineFlags -XX:-ResizeTLAB - XX:-ScavengeBeforeFullGC -XX:TLABSize=262144 -XX:ThresholdTolerance=100 -XX:+UseParallelGC -XX:YoungPLABSize=262144

[Windows 7 (32 bit) JavaVM: 1.6.0_17] XX:+AggressiveOpts -XX:BaseFootPrintEstimate=1006632959 -XX: +BindGCTaskThreadsToCPUs -XX:CompilationPolicyChoice=0 -XX:MaxHeapSize=1006632959 -XX:MaxNewSize=377487357 - XX:NewSize=377487357 -XX:OldPLABSize=8192 -XX:ParallelGCThreads=2 -XX:+PrintCommandLineFlags -XX:-ResizeTLAB -XX:-ScavengeBeforeFullGC - XX:TLABSize=262144 -XX:ThresholdTolerance=100 -XX:-UseLargePagesIndividualAllocation -XX:+UseParallelGC - XX:YoungPLABSize=262144

[Windows 7 (64 bit) JavaVM: 1.6.0_17] -XX:+AggressiveOpts -XX:BaseFootPrintEstimate=1791376592 -XX: +BindGCTaskThreadsToCPUs -XX:CompilationPolicyChoice=0 -XX:MaxHeapSize=1791376592 -XX:MaxNewSize=671766222 - XX:NewSize=671766222 -XX:OldPLABSize=8192 -XX:ParallelGCThreads=2 -XX:+PrintCommandLineFlags -XX:-ResizeTLAB -XX:-ScavengeBeforeFullGC - XX:TLABSize=262144 -XX:ThresholdTolerance=100 -XX:-UseLargePagesIndividualAllocation -XX:+UseParallelGC - XX:YoungPLABSize=262144

On Dec 3, 2009, at 11:40 PM, Pratik Solanki wrote:

On Dec 3, 2009, at 11:15 PM, Ted Neward wrote:
Does the Mac JVM generally support the full suite of –XX flags?
In general, any -XX flag that works on a Sun JVM on other OSes should work just as well on the Mac. If that's not the case, please file a bug. The stability and support of the flag, however, varies. Some (like -XX:+UseParallelGC) are more supported than others. Some flags may be OS specific and may not work on the Mac. And some others may have different behaviour. It depends. For the most part though, the behaviour should be identical to other OSes. Is there any particular flag that you wanted to use on the Mac?

Pratik

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References:
	>java -server jvm option: (From: Michael Dever <email@hidden>)
	>Re: java -server jvm option: (From: Mike Swingler <email@hidden>)
	>Re: java -server jvm option: (From: Charles Ditzel <email@hidden>)
	>Re: java -server jvm option: (From: Michael Dever <email@hidden>)
	>RE: java -server jvm option: (From: "Ted Neward" <email@hidden>)
	>Re: java -server jvm option: (From: Pratik Solanki <email@hidden>)

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