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List:       openjdk-serviceability-dev
Subject:    Re: VisualVM CPU sampling not working
From:       Mandy Chung <mandy.chung () oracle ! com>
Date:       2017-05-18 20:45:49
Message-ID: F8D0F2FC-A360-4970-AFD2-02802BF47604 () oracle ! com
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> On May 18, 2017, at 1:29 PM, Alan Bateman <Alan.Bateman@oracle.com> wrote:
> 
> On 18/05/2017 20:39, Alan Snyder wrote:
> 
> > As far as I can tell, the latest VisualVM (1.3.9) is unable to do CPU sampling or \
> > profiling on the latest EA build (9-ea+169-jigsaw-nightly-h6406-20170517). 
> > Is this really the case, or am I missing something?
> > 
> > Is someone working on this?
> I took a quite look.
> 
> As Mandy said in the previous mail, the JMX interop issue between JDK 8 and JDK 9 \
> is JDK-8167121. This is fixed in jdk8u-dev but hasn't got into a released JDK 8 \
> update yet. 
> So as a test, I ran Visual VM 1.3.9 on a JDK 9 build to attach to an application \
> running on the same JDK 9 build. As VisualVM (or maybe the NetBeans framework that \
> it builds on) makes use of a number of JDK internal APIs. It has encapsulation \
> busting command line options configured in etc/visualvm.conf but the module names \
> aren't quite right - specifically, jdk.jvmstat was renamed to jdk.internal.jvmstat \
> a couple of builds ago. I fixed those and it started up okay. I tried the Monitor, \
> Threads, and Sampler tabs and they seem to work okay.

VisualVM 1.3.9 was released on Oct 2016.  It has to be updated to work with the \
latest JDK 9 release.  You may reference the —-add-opens options used by NetBeans \
Dev version (under etc/netbeans.conf)

Mandy=


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