jmap

[Brian Gardner]

We've identified a leak using the verbose GC information.  On linux, we 
would simply pull a live server offline after a couple days of use and 
use jmap to get a histo, and/or complete dump if necassary.  I'm looking 
into what it would take to port the Servicability Agent to Freebsd.  
Thanks for your feedback.

Brian

Greg Lewis wrote:
> On Thu, Jan 08, 2009 at 09:44:04AM -0800, Brian Gardner wrote:
>   
>> Are there alternates methods available to access heap information from a 
>> running vm?  This seems quite essential for tuning so I'd like to think 
>> there is something out there.
>>     
>
> I'm not sure, since I don't do much with this myself.  It seems like there
> are some reasonable Eclipse plugins for doing stuff like that, but I
> haven't tried to hook them up and I'm not sure what interface they use.
>
> I do know I can analyse heap dumps...but thats obviously different than
> a running VM.  In terms of tuning the verbose GC information can also be
> quite useful.
>
>   
>> Greg Lewis wrote:
>>     
>>> On Tue, Jan 06, 2009 at 03:17:28PM -0800, Brian Gardner wrote:
>>>   
>>>       
>>>> I'm trying to use jmap to dump a histo of a running vm, version 
>>>> jdk-1.6.0.3p4_6.  jmap keeps returning the following error, 'no 
>>>> providers installed'.  Are these tools supposed to function?  If not are 
>>>> there any alternates?
>>>>
>>>> $ /usr/local/jdk1.6.0/bin/jps
>>>> 72095 Jps
>>>> 88259 Bootstrap
>>>>
>>>> $ /usr/local/jdk1.6.0/bin/jmap -histo 88259
>>>> 88259: no providers installed
>>>>
>>>> $ ps -jax | grep 88259
>>>> ee         88259     1 88249 87874    0 I     p0   15:39.48 [java]
>>>> ee         72142 72094 72141 88505    2 R+    p1    0:00.00 grep 88259
>>>>     
>>>>         
>>> I don't know for sure, but I'm guessing that jmap requires a
>>> serviceability agent, which there isn't an implementation of for
>>> FreeBSD yet.  We basically just either skip building or stub out
>>> all the code for that.
>>>
>>>   
>>>       
>
>