Date: Thu, 08 Jan 2009 11:47:31 -0800 From: Brian Gardner <brian@experts-exchange.com> To: Greg Lewis <glewis@eyesbeyond.com> Cc: freebsd-java@freebsd.org Subject: Re: jmap Message-ID: <49665853.4000403@experts-exchange.com> In-Reply-To: <20090108191441.GA40091@misty.eyesbeyond.com> References: <4963E688.2060005@experts-exchange.com> <20090108044605.GA26885@misty.eyesbeyond.com> <49663B64.5040204@experts-exchange.com> <20090108191441.GA40091@misty.eyesbeyond.com>
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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. >>> >>> >>> > >
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