Thanks for your all replys. I review the dump file with both SAP MemoryAnalyzer and YourKit They all show the same hierachy as follows:
-org.apache.wicket.settings.Settings - org.apache.wicket.Localizer - org.apache.wicket.util.concurrent.ConcurrentHashMap - org.apache.wicket.util.concurrent.ConcurrentHashMap$Entry Localizer Object retaind 87.84% HeapSize. while the DiskPageStore only retained 0.71% That's weird,isn't it? I decrease the max heapsize settings to 50M, and make a load test then monitor the memory allocation. It indeed allocated more and more char[] objects time by time. Iman,how do you solve your problem at last? could you share some experience with me ? Thank you very much. 2008/5/10 Iman Rahmatizadeh <[EMAIL PROTECTED]>: > I've seen this before, altough it wasnt 2GB, but in a small 70MB heap dump > the cache size was around 25MB. The ConcurrentHashMap caches a lot of > unneeded string keys, where the keys are quite large, maybe strings of size > 1k characters, like key : > > "org.apache.wicket.extensions.markup.html.repeater.data.table.DataTable$1:rows-ir.co.meraat.avicenna.web.components.AvicennaDataTable$InnerDataTable:inner-table-ir.co.meraat.avicenna.web.components.AvicennaDataTable$1:filter-form-ir.co.meraat.avicenna.web.components.AvicennaDataTable:table-ir.co.meraat.avicenna.vita.GradesManagementPanel$1:studentSearch-ir.co.meraat.avicenna.vita.GradesManagementPanel:componentId-ir.co.meraat.avicenna.web.CompositePage:5-fa_IR-nullg.apache.wicket.markup.repeater.OddEvenItem:29-...." > > As you see the component hierarchy is dumped into the string, making it > very > large. I guess we're both localizing a lot of strings, so our problem could > be the same. > > Iman > > On Sat, May 10, 2008 at 9:38 AM, Johan Compagner <[EMAIL PROTECTED]> > wrote: > > > Can you really see what it holds? > > Almost 2G in memory in localizer is extreme... Thats really a lot of > > strings.. > > You could try to read that dump with yourkit if your current one > > doesnt show enough. > > > > On 5/9/08, Quan Zhou <[EMAIL PROTECTED]> wrote: > > > Hello everyone. > > > > > > I recently develop my App use Wicket1.3.3. It's my first time to use > this > > > framework and I feel it's really really a perfect framework for me. > > > My app support both Simplified Chinese , Traditional Chinese, I > implement > > > this with Wicket i18n feature. > > > With the load increasing these days, I found my app would become very > lag > > > abount every 24 hours ,so that i would only restart it > > > without any choice. > > > when I found the lag, My log records many Exceptions like : > > > "after 1 minute the Pagemap null is still locked by: > > > Thread[http-8080-321,5,main], giving > > > up trying to get the page for path xxx" > > > > > > I check the JVM status with jstat -gc , It tells that the Heapsize is > > full > > > even after full GC. > > > My VM paraemter is "-Xms2000m -Xmx2000m -XX:MaxNewSize=250m > > > -XX:MaxPermSize=250m" > > > My deploy server has 2*CPU and 4G memory, Redhat AS4 OS + tomcat 6.0. > > > There're 2000 sessions on the day while the timeout threshold is 15 > > minutes. > > > So i dump the whole heapsize with the command " jmap > > > -dump:live,format=b,file=3.dump.hprof processid" > > > and i truely get a 2G size dump files. I use SAP Memory Analyer to see > > > what're stored in HeapMemory. > > > and I found a strange number of Retained Heap usage: > > > Classname > > > ShallowHeap RetainHeap > > > RetainedHeap% > > > [EMAIL PROTECTED] > > > 16 > > > 1,755,070,352 87.64% > > > [EMAIL PROTECTED] > > > 48 1,755,070,336 87.69% > > > [EMAIL PROTECTED] > > > 33,554,448 > > > 1,755,069,632 87.69% > > > - [EMAIL PROTECTED] > ... > > > 24 3928 > > > 0.00% > > > - [EMAIL PROTECTED] > ... > > > 24 3928 > > > 0.00% > > > - [EMAIL PROTECTED] > ... > > > 24 3928 > > > 0.00% > > > - [EMAIL PROTECTED] > ... > > > 24 3928 > > > 0.00% > > > - [EMAIL PROTECTED] > ... > > > 24 3928 > > > 0.00% > > > - [EMAIL PROTECTED] > ... > > > 24 3928 > > > 0.00% > > > + 2,863,659 more... > > > > > > Is that means that the Localizer Object used most of the heap size? > > > or Is this number normal for Wicket App? > > > > > > I wonder whether I forget to release the memory by my mis-using of i18n > > > feature? > > > Is there any attentions I must pay to when dealing with Localizer? > > > > > > This problem annoys me more the 2 weeks. I really need some help. > Thanks > > . > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > >
