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List: openjdk-serviceability-dev
Subject: RE: javaone 2012 presentation on Diagnosing Your Application on the JVM : Question on attach on Wind
From: "Bacchu, Anjan" <anjan.bacchu () hpe ! com>
Date: 2016-03-31 11:30:39
Message-ID: F53B76A14E75764283B3CFF6D24B9DCD0FDA672C () G4W3205 ! americas ! hpqcorp ! net
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[Attachment #2 (text/plain)]
Hi Staffan,
Thank you very much for the presentation and the quick response.
Jcmd/jmap : Unfortunately, we ship only the Client JRE with our product. \
Customer doesn't have access to jcmd/jmap. That's why I was looking for an outside \
solution.
Then I came across https://github.com/apangin/jattach – however this is only for \
linux/bsd. I wanted to use "HotSpot Dynamic Attach Mechanism" to dump the heap on \
Windows by writing a similar utility for windows.
Thanks again,
BR,
~A
From: Staffan Larsen [mailto:staffan.larsen@oracle.com]
Sent: Thursday, March 31, 2016 12:53 AM
To: Bacchu, Anjan <anjan.bacchu@hpe.com>
Cc: serviceability-dev@openjdk.java.net
Subject: Re: javaone 2012 presentation on Diagnosing Your Application on the JVM : \
Question on attach on Windows
On 30 mars 2016, at 09:40, Bacchu, Anjan \
<anjan.bacchu@hpe.com<mailto:anjan.bacchu@hpe.com>> wrote:
Hi Staffan,
I just now saw the presentation slides at \
http://www.slideshare.net/stalar/diagnosing-your-application-on-the-jvm.
On Slide 16 of the presentation, you show the details of the "HotSpot Dynamic Attach \
Mechanism" for Windows.
1) You talk about Remote process injecting code into the JVM using combination of \
VirtualAllocEx and 2) WriteProcessMemory. Further it goes ahead and creates a Remote \
thread in the JVM to call above code.
Do you have some sample code which does this, to say, dump the heap ?
If you want to dump the heap, take a look at "jcmd <pid> GC.heap_dump":
----------
Generate a HPROF format dump of the Java heap.
Impact: High: Depends on Java heap size and content. Request a full GC unless the \
'-all' option is specified.
Permission: java.lang.management.ManagementPermission(monitor)
Syntax : GC.heap_dump [options] <filename>
Arguments:
filename : Name of the dump file (STRING, no default value)
Options: (options must be specified using the <key> or <key>=<value> syntax)
-all : [optional] Dump all objects, including unreachable objects \
(BOOLEAN, false)
----------
You can also use "jmap -dump <pid>.
I used to develop windows application long ago and just from the slide #16 \
andhttp://openjdk.java.net/groups/hotspot/docs/Serviceability.html#battach, I'm \
unable to proceed further.
The source code is in the VirtualMachineImpl.c file for windows: \
http://hg.openjdk.java.net/jdk9/jdk9/jdk/file/1565a0efe6f0/src/jdk.attach/windows/native/libattach/VirtualMachineImpl.c
All help will be useful.
Thank you very much,
BR,
~A
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<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D">Hi \
Staffan,<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D"> \
Thank you very much for the presentation and the quick \
response.<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D"> \
Jcmd/jmap : Unfortunately, we ship only the Client JRE with our product. Customer \
doesn't have access to jcmd/jmap. That's why I was looking for an outside \
solution.<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D">Then I came across <a \
href="https://github.com/apangin/jattach">https://github.com/apangin/jattach</a> \
</span><span style="font-size:11.0pt;font-family:"Courier \
New";color:#1F497D">–</span><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D"> however this is only \
for linux/bsd. I wanted to use "</span><span \
style="font-size:11.0pt;font-family:Inconsolata">HotSpot Dynamic Attach \
Mechanism</span><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D">" to dump the heap on \
Windows by writing a similar utility for windows.<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D">Thanks \
again,<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D">BR,<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D">~A<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D">
<o:p></o:p></span></p>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata;color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Staffan Larsen \
[mailto:staffan.larsen@oracle.com] <br>
<b>Sent:</b> Thursday, March 31, 2016 12:53 AM<br>
<b>To:</b> Bacchu, Anjan <anjan.bacchu@hpe.com><br>
<b>Cc:</b> serviceability-dev@openjdk.java.net<br>
<b>Subject:</b> Re: javaone 2012 presentation on Diagnosing Your Application on the \
JVM : Question on attach on Windows<o:p></o:p></span></p> </div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">On 30 mars 2016, at 09:40, Bacchu, Anjan <<a \
href="mailto:anjan.bacchu@hpe.com">anjan.bacchu@hpe.com</a>> wrote:<o:p></o:p></p> \
</div> <p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Inconsolata">Hi \
Staffan,</span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata"> </span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata"> I \
just now saw the presentation slides at<span \
class="apple-converted-space"> </span><a \
href="http://www.slideshare.net/stalar/diagnosing-your-application-on-the-jvm"><span \
style="color:#954F72">http://www.slideshare.net/stalar/diagnosing-your-application-on-the-jvm</span></a>.</span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata"> </span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Inconsolata">On Slide \
16 of the presentation, you show the details of the "HotSpot Dynamic Attach \
Mechanism" for Windows.</span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata"> </span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div style="margin-left:.5in">
<p class="MsoNormal" style="text-indent:-.25in"><span \
style="font-size:11.0pt;font-family:Inconsolata">1)</span><span \
style="font-size:7.0pt"> <span \
class="apple-converted-space"> </span></span><span \
style="font-size:11.0pt;font-family:Inconsolata">You talk about Remote process \
injecting code into the JVM using combination of VirtualAllocEx and</span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div style="margin-left:.5in">
<p class="MsoNormal" style="text-indent:-.25in"><span \
style="font-size:11.0pt;font-family:Inconsolata">2)</span><span \
style="font-size:7.0pt"> <span \
class="apple-converted-space"> </span></span><span \
style="font-size:11.0pt;font-family:Inconsolata">WriteProcessMemory. Further it goes \
ahead and creates a Remote thread in the JVM to call above code.</span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata"> </span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata"> </span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Inconsolata">Do you \
have some sample code which does this, to say, dump the heap ?</span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
</div>
</blockquote>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">If you want to dump the heap, take a look at "jcmd \
<pid> GC.heap_dump": <o:p></o:p></p> </div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">----------<o:p></o:p></p>
<div>
<p class="MsoNormal">Generate a HPROF format dump of the Java heap.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Impact: High: Depends on Java heap size and content. Request a \
full GC unless the '-all' option is specified.<o:p></o:p></p> </div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Permission: \
java.lang.management.ManagementPermission(monitor)<o:p></o:p></p> </div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Syntax : GC.heap_dump [options] <filename><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Arguments:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span \
class="apple-tab-span"> \
</span>filename : Name of the dump file (STRING, no default \
value)<o:p></o:p></p> </div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Options: (options must be specified using the <key> or \
<key>=<value> syntax)<o:p></o:p></p> </div>
<div>
<p class="MsoNormal"><span \
class="apple-tab-span"> \
</span>-all : [optional] Dump all objects, including unreachable objects (BOOLEAN, \
false)<o:p></o:p></p> </div>
<div>
<p class="MsoNormal">----------<o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">You can also use "jmap -dump <pid>.<o:p></o:p></p>
</div>
<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata"> </span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Inconsolata">I used to \
develop windows application long ago and just from the slide #16 and<a \
href="http://openjdk.java.net/groups/hotspot/docs/Serviceability.html#battach"><span \
style="color:#954F72">http://openjdk.java.net/groups/hotspot/docs/Serviceability.html#battach</span></a>,
I'm unable to proceed further.</span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
</div>
</blockquote>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">The source code is in the VirtualMachineImpl.c file for \
windows: <a href="http://hg.openjdk.java.net/jdk9/jdk9/jdk/file/1565a0efe6f0/src/ \
jdk.attach/windows/native/libattach/VirtualMachineImpl.c">http://hg.openjdk.java.net/j \
dk9/jdk9/jdk/file/1565a0efe6f0/src/jdk.attach/windows/native/libattach/VirtualMachineImpl.c</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata"> </span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Inconsolata">All help \
will be useful.</span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata"> </span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:Inconsolata">Thank you \
very much,</span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata"> </span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata">BR,</span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span \
style="font-size:11.0pt;font-family:Inconsolata">~A</span><span \
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p></o:p></span></p>
</div>
</div>
</blockquote>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</body>
</html>
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