A couple of other findings: - Tomcat 5.5.28 out-of-the-box with its default webapps has no problem starting with the default (parallel) gc - As soon as I remove the default webapps, add ours, and modify the context.xml file to provide it a DataSource, Tomcat hangs. We're definitely loading a lot more into memory and inducing garbage collection with Hibernate and Spring in the mix. I think I'm going to try a Hibernate or Spring sample webapp to see if it has similar problems.
On Thu, Sep 10, 2009 at 4:43 PM, Caldarale, Charles R < chuck.caldar...@unisys.com> wrote: > > From: Bradley Wagner [mailto:bradley.wag...@hannonhill.com] > > Subject: Re: 100% usage and hanging on startup of Spring/Hibernate app > > in Tomcat 5.5 on Ubuntu 7 > > > > The *only option* that did not cause the startup process to > > halt indefinitely on startup was the Serial GC option. > > This is really weird. Might be time to file a bug report with Sun. > > > - Does this indicate some kind of threading problem in this Java env? > > Hard to tell without a snapshot of what's going on inside the GC code > (which is all C++, not Java). Could also be a problem with Ubuntu. > > > - Does the option "DoEscapeAnalysis" still use a parallel gc? > > Should be independent of the GC algorithm; it's extra logic in the JIT that > determines whether or not an object even needs to be allocated, or if it can > simply reside on the method's stack. > > > - Is the experimental more similar to the parallel or the serial? > > My understanding is that G1GC is both parallel and concurrent. > > - Chuck > > > THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY > MATERIAL and is thus for use only by the intended recipient. If you received > this in error, please contact the sender and delete the e-mail and its > attachments from all computers. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
