Hi, first, I want to thank Mark Wood for recommending LambdaProbe, it is proving a very useful tool. I can see already that we need to increase our PermGen, and will probably borrow Mark's JAVA_OPTS settings for our production and development Tomcat instances.
In trying to further educate myself about these issues, I came across this excellent page on the Tomcat wiki, which at the end includes debugging/troubleshooting advice that is very close to the procedure Graham Triggs outlined at a recent committer's meeting. I'm forwarding this link to the list, as I think it might prove useful to others: http://wiki.apache.org/tomcat/OutOfMemory --Hardy > -----Original Message----- > From: Mark H. Wood [mailto:mw...@iupui.edu] > Sent: Wednesday, September 29, 2010 12:08 PM > To: dspace-tech@lists.sourceforge.net > Subject: Re: [Dspace-tech] tomcat reporting memory leak? > > I'd like to point out that the discussion is broadening considerably: > a system can be slow for many reasons, not just memory starvation. > > Step 1: what resource(s) are you short of? Something like LambdaProbe > can peek inside Tomcat and show you how much of each of the various > memory pools is being used. OS tools can show whether you are > swapping heavily or spending a lot of time in I/O wait or are really > CPU-bound (and what, besides Tomcat, may be eating CPU). DBMS tools > can reveal places in the schema that don't scale well, queries that > could be optimized, and additional indices that would be beneficial. > > It would be really helpful for large, busy sites with performance > problems to share any such detailed observations. Some of those > problems can probably be tuned away, and some will point to specific > things for coders to investigate. Scaling experience will be valuable > both in documenting good ways to tune up for DSpace and in finding > design hotspots for rework. > > -- > Mark H. Wood, Lead System Programmer mw...@iupui.edu > Balance your desire for bells and whistles with the reality that only a > little more than 2 percent of world population has broadband. > -- Ledford and Tyler, _Google Analytics 2.0_ ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ DSpace-tech mailing list DSpace-tech@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dspace-tech
