Thank you very much David, seems like we have to upgrade. On 2/15/06, David Bishop <[EMAIL PROTECTED]> wrote: > Hi, > > I was running Apache Cocoon with Tomcat 5.0.28 and a Sun 1.4.2 JVM. > > Unexpectedly the system was falling over at a certain load and not > gracefully slowing down. At a certain number of concurrent users it > was returning very strange errors including Java Out of Memory > errors, but only after returning some weird ones! > > After doing some intensive testing and not getting anywhere I looked > for help from the Cocoon community and was pointed at the JVM because > the stock for garbage collection is no good for web servers and can > be improved with fine tuning via command line parameters. The > following document has some good points regarding it.. > > http://java.sun.com/docs/hotspot/gc1.4.2/index.html > > I actually solved all my problems by upgrading to the 1.5 JVM which > has far better garbage collection handling and I have found under > regression testing the web system gracefully slows down when things > get tough as opposed to falling over, it also performs much better > than it did under the 1.4.2 JVM. > > Hope this helps, > > David. > > On 15 Feb 2006, at 13:29, Leon Rosenberg wrote: > > > Hi, > > > > has someone ever estimated the max possible load for tomcat? We are > > suffering from very odd behaviour, as long as tomcat/machine is under > > certain load it works very well, but then it just "breaks a magical > > limit" and the performance breaks down. > > Tomcat or the JVM are starting to leak memory (we are running with > > mx800M, and are normally at 600+ free memory, but then it goes to > > zero). Tomcat begins to throw absolutely ununderstandable exceptions, > > like beans not present in scope which are normally there, socket/pipe > > errors, unable to deliver 5xx or 4xx error pages and so on. Busy > > threads are going high, from 10-20 to some hundreds. > > > > We are running with jdk1.4.2_04, tomcat 5.0.25, linux kernel 2.6.8 > > (debian) 32 bit on different hardware, intel or opteron 1-2 > > processors, 32 and 64 bit processors (up to 4 virtual processors). No > > tomcat clustering, no app. server. Our loadbalancing is based on CPU > > Idle time, so the amount of traffic on each machine is different, > > faster machines serving 4 times more then slower. The faster machines > > are serving 100-150 requests per second in normal, and approx. 300-400 > > requests per second in peak times. Avg. request duration is <15 ms in > > normal times (the servlet execution, not counting the jsp transmission > > afterwards) and 100-200 under high load. > > > > We need some serious performance benchmarks, but those are hard to > > find (most people talk about absolutely irrelevant things like > > database tuning)... > > Any good links? > > > > TIA > > Leon > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > >
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