heap-dump

I was trying to investigate java.lang.OutOfMemoryError: GC limit exceeded which occurs at high load of our web app deployed in tomcat. Heap size was set to 8GB ( -Xms2048m -Xmx8192m ) At some point in time our application become unresponsive due to GC activity overhead. I could see in logs that Full GC was occurring multiple times in a row. So I took heap dump with following command ( jmap -F -dump:format=b,file=/root/dump2.hprof 4963 ). File containing dump was 9GB in size. After dump was taken (app was frozen for about 45minutes), multiple full GCs occured till OutOfMemoryError was thrown.

I have one problem with java heap memory. I developed one client server application in java which is run as a windows service it requires more than 512MB of memory. I have 2GB of RAM but when I run my application it throws an exception Out of memory error:java heap space but I have already set heap size (maximum 512MB) in the java control panel and I still get the same error. I can't set heap size through the command line because my application runs as a windows service so how can I increase the default heap size? Please note that increasing the Java heap size following an java.lang

I need to check my application for memory leaks, i also need to see the memory allocation of my application. I downloaded and installed eclipse memory analyzer, and it looks like the first step is to open a heap dump. But what is a heap dump, how can i create a heap dump. And how exactly am i going to use this software, I did some googling but i couldn't find any useful information thanks When you debug your app, open DDMS in Eclipse. On the toolbar there is a heap dump button that you can use to generate a heap dump to view in Eclipse memory analyzer. This is only supported I think with the 1

I have a Java application that I run from a console which in turn executes an another Java process. I want to get a thread/heap dump of that child process. On Unix, I could do a kill -3 <pid> but on Windows AFAIK the only way to get a thread dump is Ctrl-Break in the console. But that only gives me the dump of the parent process, not the child. Is there another way to get that heap dump? rkaganda You can use jmap to get a dump of any process running, assuming you know the pid . Use Task Manager or Resource Monitor to get the pid . Then jmap -dump:format=b,file=cheap.hprof <pid> to get the heap