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From Mark Thomas <ma...@apache.org>
Subject Re: How to enable Native Memory Tracking(NMT) in Tomcat?
Date Thu, 02 Mar 2017 14:38:05 GMT
On 02/03/17 10:54, Suvendu Sekhar Mondal wrote:
> Hello Everyone,
> 
> I am new here. :)
> 
> Environment:
> Java Version: Java HotSpot(TM) 64-Bit Server VM version 25.91-b15
> (Java version 1.8.0_91-b15)
> Tomcat Version: Tomcat 8.0.20
> OS Version: Microsoft Windows 8.1 Enterprise
> 
> I am trying to enable Native Memory Tracking(NMT) to get internal
> memory usage deatils about Tomcat process which is running on my
> system. I have added following flags to Tomcat's Java options:
> -XX:+UnlockDiagnosticVMOptions
> -XX:NativeMemoryTracking=summary
> -XX:NativeMemoryTracking=detail
> 
> After that I restarted Tomcat. When I tried to use "VM.native_memory"
> command either from JCMD or JMC, I am getting "Native memory tracking
> is not enabled" message. When I shutdown Tomcat, following message is
> getting printed on STDERR log:
> "Java HotSpot(TM) 64-Bit Server VM warning: Native Memory Tracking did
> not setup properly, using wrong launcher?".
> 
> I found this article which discussed about NMT problem in custom JVM launcher:
> https://blogs.oracle.com/poonam/entry/using_nmt_with_custom_jvm
> 
> My question is, does that stands true for Tomcat also? Is there any
> other way to enable NMT in Tomcat?

No idea. How did you start Tomcat?

Mark


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