Eclipse updating indexes java heap space validating files
In our case, we will be using the open source tool MAT by the Eclipse Foundation. We will go through a sequence of steps that will help explore the different features and views of MAT to get to an example of an OOM heap dump and think through the analysis. The above tells us that there were 454,570 JVM finalizer instances occupying almost 50% of the allocated application memory. What does this lead us to understand, based on the basic assumption that the reader knows what Java Finalizers do?Read here for a primer: Essentially, there are custom finalizers written by the developer to release certain resources held by an instance.These instances that are collected by the finalizers are collected outside the scope of the JVM GC collection algorithms using a separate queue.Essentially, this is a longer path to cleaning up by the GC.
We will be exploring in detail below how to analyze a heap dump using a heap analysis tool.
Let this be handled by the gencon garbage collector itself. For me it now takes about a minute to process a 1 GB heap. ---Jeroen Troubleshooting Out Of Memory Errors Processing large dump files Processing large dump files using Memory Analyzer may sometimes fail with a The default maximum Java heap size when running ISA 4.1 is 256Mb.
messag e ID=14217619 and some more digging, I found that the vm arguments are set in the file: jvm.properties in location on my disk: C:\Program Files (x86)\IBM\IBM Support Assistant v41\rcp\eclipse\plugins\rcp.j2se.win32.x86_220.127.116.11 90211a-200903301321\ I recommend removing the -Xmn parameter for the new space size.
Sun Hot Spot JVM has a way to instruct the JVM to dump its heap state when the JVM runs out of memory into a file. So, to enable this feature, add XX: Heap Dump On Out Of Memory Error to the JVM startup options.
Adding this option is essential to production systems since out of memory could take a long time to happen.