jmap

[Kurt Miller]

Hi Brian,

Greg, myself and the rest of the active bsd-java porters have
all signed Sun's Contributor Agreement so that our work could
be incorporated into OpenJDK (GPLv2 licensed). Longer term jdk
1.6 and 1.7 will be based off OpenJDK's code base so you will
need to sign and perhaps your company may need to sign the SCA
before we could include it in the OpenJDK bsd-java port.

Details for the SCA can be found here:

http://openjdk.java.net/contribute/
http://sun.com/software/opensource/sca.pdf
https://sca.dev.java.net/CA_signatories.htm

Regards,
-Kurt

On Thursday 08 January 2009 4:25:06 pm Brian Gardner wrote:
> It looks like I'll be able to port the Linux SA, hopefully without any 
> problems.  How should I test and/or submit the patch so that the 
> community can benefit, and the company I work for gets credit for the 
> improvement.  Should I create a patch for the jdk16.patches file,. 
> simply edit the jdk16.patches, or supply my patch in it's own file?
> 
> Thanks,
> 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.
> >>>
> >>>   
> >>>       
> >
> >   
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