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From "Jeffrey Janner" <Jeffrey.Jan...@PolyDyne.com>
Subject RE: [OT] Jconsole Perform GC?
Date Tue, 09 Nov 2010 15:52:24 GMT
I must say, I was impressed with the speed of the full GC.  Blink of an
eye fast.

> -----Original Message-----
> From: Jeffrey Janner [mailto:Jeffrey.Janner@PolyDyne.com]
> Sent: Tuesday, November 09, 2010 9:51 AM
> To: Tomcat Users List
> Subject: RE: [OT] Jconsole Perform GC?
> 
> Thanks Chuck.  Just what I was interested in.
> 
> 
> > -----Original Message-----
> > From: Caldarale, Charles R [mailto:Chuck.Caldarale@unisys.com]
> > Sent: Tuesday, November 09, 2010 9:05 AM
> > To: Tomcat Users List
> > Subject: RE: [OT] Jconsole Perform GC?
> >
> > > From: Jeffrey Janner [mailto:Jeffrey.Janner@PolyDyne.com]
> > > Subject: [OT] Jconsole Perform GC?
> >
> > > Anyone know what exactly what kind of GC the "Perform GC"
> > > button in Jconsole does?
> >
> > The same one you get by calling System.gc() - a full GC.
> >
> > > The initial work was mostly in the Eden space and Survivor
> > > spaces for most of the day, then suddenly, a big chunk
> > > (nearly 4GB) ended up in the Old Gen space and pretty much
> > > stayed there all night.
> >
> > Anything too big for the Eden space will be allocated directly in
> > tenured.
> >
> > > Looking at the other individual graphs showed that there had
> > > been several instances of GC performed by the JVM during that
> > > time, but it took my manual instance to clear the Old Gen.
> >
> > Those were minor collections, cleaning out only the Eden space.
> >
> > > Is this just "normal" JVM GC processing?
> >
> > Yes, that's completely normal.  The JVM will not do a major (full)
GC
> > unless it has to - or is forced by the API invocation.
> >
> >  - Chuck
> >
> >
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