jmap

[Brian Gardner]

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.

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.
>
>