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Posted to users@tomcat.apache.org by Suvendu Sekhar Mondal <su...@gmail.com> on 2017/03/02 10:54:06 UTC
How to enable Native Memory Tracking(NMT) in Tomcat?
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?
Thanks!
Suvendu
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Re: How to enable Native Memory Tracking(NMT) in Tomcat?
Posted by Suvendu Sekhar Mondal <su...@gmail.com>.
It worked, Mark! When I launched Tomcat from command line, it fired up
Bootstrap loader. Then JMC can print NMT statistics.
I believe tracking NMT is not a common need. Still, it would be
awesome if we can do the same thing with changes in Apache Commons
Daemon.
Thanks!
On Fri, Mar 3, 2017 at 2:06 PM, Mark Thomas <ma...@apache.org> wrote:
> On 03/03/17 06:20, Suvendu Sekhar Mondal wrote:
>> Mark,
>> I am running Tomcat as a Windows service.
>
> Then I suspect that supporting this would require changes in Apache
> Commons Daemon which is what Tomcat uses to start the Windows service.
>
> It would probably be quicker for you to run Tomcat from the command line
> to get the debugging information you require - assuming you have a
> one-off need. If you want ongoing monitoring then Daemon changes is
> would be the better option.
>
> Mark
>
>>
>> Thanks!
>> Suvendu
>>
>> On Thu, Mar 2, 2017 at 8:08 PM, Mark Thomas <ma...@apache.org> wrote:
>>> 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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>>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>
>
> ---------------------------------------------------------------------
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>
---------------------------------------------------------------------
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Re: How to enable Native Memory Tracking(NMT) in Tomcat?
Posted by Mark Thomas <ma...@apache.org>.
On 03/03/17 06:20, Suvendu Sekhar Mondal wrote:
> Mark,
> I am running Tomcat as a Windows service.
Then I suspect that supporting this would require changes in Apache
Commons Daemon which is what Tomcat uses to start the Windows service.
It would probably be quicker for you to run Tomcat from the command line
to get the debugging information you require - assuming you have a
one-off need. If you want ongoing monitoring then Daemon changes is
would be the better option.
Mark
>
> Thanks!
> Suvendu
>
> On Thu, Mar 2, 2017 at 8:08 PM, Mark Thomas <ma...@apache.org> wrote:
>> 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
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
---------------------------------------------------------------------
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Re: How to enable Native Memory Tracking(NMT) in Tomcat?
Posted by Suvendu Sekhar Mondal <su...@gmail.com>.
Mark,
I am running Tomcat as a Windows service.
Thanks!
Suvendu
On Thu, Mar 2, 2017 at 8:08 PM, Mark Thomas <ma...@apache.org> wrote:
> 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
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
---------------------------------------------------------------------
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For additional commands, e-mail: users-help@tomcat.apache.org
Re: How to enable Native Memory Tracking(NMT) in Tomcat?
Posted by Mark Thomas <ma...@apache.org>.
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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