I'm not sure, but I doubt the mailing list supports attachments. Maybe you could provide a link to some image hosting site?
My first thought, reflection is darn cheap, especially since Java 5 and even more since Java 6. I'm no IBM JVM specialist, but I don't think there are major differences with HotSpot... Compared with SQL queries, backend transactions, web service calls, etc. reflective method invocations really don't make a difference. Having said that, what kind of application are you testing? Does this application have any I/O, locking or other expensive things that may be the cause of the CPU-time imbalance? Also, what kind of load are you simulating on your application? Long sessions with not much users? Lots of short sessions? Hyperactive users without any pauses? /JK Ps. How did you configure your profiler? Sampling or tracing/instrumentation? Although I don't think it makes a difference in this case, sampling is less accurate... 2010/1/8 Ravi Kapoor <[email protected]>: > > The actual call to getter method is only using 2% CPU. Rest 38% is being > used within trinidad classes. > I am attaching two screenshots to give you more details. > > In first screenshot, you can see at the top left corner, total CPU units > taken by getProperty are 32391 > getProperty calls javax.faces.el.ValueBinding.getValue which calls > org.apache.myfaces.el.PropertyResolverImpl.getValue which calls > org.apache.myfaces.el.PropertyResolverImpl.getProperty which calls > java.lang.reflect.Method.invoke. > > In second screenshot you can see that Method.invoke is using only 1781 units > of CPU. Rest of the time is being spent within trinidad classes. > > Does this help? Also the rest of trinidad using 45% CPU usage is also highly > concerning. > > Thanks > Ravi > > > On Fri, Jan 8, 2010 at 1:47 PM, Jan-Kees van Andel > <[email protected]> wrote: >> >> Hey, >> >> Is it possible that the getProperty indirectly invokes some expensive >> computation? For example, do you have lots of logic inside your >> getters? >> >> Regards, >> Jan-Kees >> >> >> 2010/1/8 Ravi Kapoor <[email protected]>: >> > Hi Matthias, >> > >> > Here are the details: >> > >> > Server: Websphere 6.1 >> > >> > Trinidad version: 1.0.7 (We cant upgrade to 2.0 until we upgrade >> > websphere >> > which will happen in due course. Even then if this issue has not been >> > addressed, the problem may exist in 2.0 as well.) >> > >> > OS: Windows (Even though I am measuring numbers on windows but I do not >> > think this is OS specific) >> > >> > >> > Let me know if you need to know anything else. >> > >> > Regards >> > Ravi >> > >> > >> > >> > On Fri, Jan 8, 2010 at 1:09 AM, Matthias Wessendorf >> > <[email protected]>wrote: >> > >> >> Hello Ravi, >> >> >> >> some more background would be good, e.g. what version of Trinidad etc. >> >> >> >> -Matthias >> >> >> >> On Thu, Jan 7, 2010 at 11:25 PM, Ravi Kapoor <[email protected]> >> >> wrote: >> >> > Has anybody done performance tests on trinidad application. I have an >> >> > application and it appears that it is taking 80-90% of CPU in my >> >> > application, thus killing performance. >> >> > >> >> > We ran load tests and our CPU went to 100% usage. At this point we >> >> measured >> >> > how much time was being taken by each class/method. Here are some >> >> > interesting figures: >> >> > >> >> > CPU usage by all Trinidad + myfaces classes = 80-90% >> >> > Myfaces CPU usage (without trinidad) = 8% (which implies trinidad is >> >> taking >> >> > 70-80% of CPU) >> >> > Total time taken by one method >> >> > (org.apache.myfaces.trinidad.bean.FacesBeanImpl.getProperty) = 40% >> >> > >> >> > Can anybody confirm that they have seen this behavior? >> >> > Or if somebody can confirm that this does not happen in their >> >> > performance >> >> > tests, that should help too. >> >> > >> >> > Thanks >> >> > Ravi >> >> > >> >> >> >> >> >> >> >> -- >> >> Matthias Wessendorf >> >> >> >> blog: http://matthiaswessendorf.wordpress.com/ >> >> sessions: http://www.slideshare.net/mwessendorf >> >> twitter: http://twitter.com/mwessendorf >> >> >> > > >
