heap-dump

问题 Unfortunately, I forgot to record the time that I took the heap dump. I hope that somewhere in the heap, the standard library caches something like System.currentTimeMillis() . Unfortunately, I do not have any business objects that cache it. One difficult option I have it to browse all the threads, and see if their local variables stored a timestamp somewhere. However, this is not technique I can apply to all heap dumps. I looked at java.lang.System in openJDK and it doesn't look like we

问题 I have generated a heap dump from my java application which has been running for some days with the jmap tool -> this results in a large binary heap dump file. How can I perform memory analysis of this heap dump within IntellIJ IDEA? I know that there are tools for Eclipse and Netbeans but I would rather use IDEA if possible. The basic results of the analysis would tell me the number of instances of each object in memory, per-class, to allow me to be able to start debugging memory leaks. 回答1:

问题 After learning java on my own, i began a project for getting data from a website through api calls for a game called torn. There were a few little details i fixed thanks to some help, but the main issue i had is still not solved. after a day and a half of running, the program just freezes. i couldn't find anything about it so far. I took heap dumps for a while and i noticed some things. hope someone can help. During the first day or so, all is well (screenshot of heap dump after 3 hours and

问题 From this Number of String Objects on stack overflow,I came to know that if we do some thing like : String s = new String("ABC"); Then we have two objects one on heap that is String and one on constant pool that is "ABC" , But today I took the heap dump and found there are two objects on heap it self. I used MAT tool for the same please find the screen shot below. So my query is if there are two Objects on heap one of Char[] and other for String class and one on constant pool then thus this

问题 From this Number of String Objects on stack overflow,I came to know that if we do some thing like : String s = new String("ABC"); Then we have two objects one on heap that is String and one on constant pool that is "ABC" , But today I took the heap dump and found there are two objects on heap it self. I used MAT tool for the same please find the screen shot below. So my query is if there are two Objects on heap one of Char[] and other for String class and one on constant pool then thus this

问题 I have several Java processes and I am trying to manage the heap dumps created when OOM error occur. When I say manage I mean name the heap dump differently, based on the originating process delete older heap dumps to preserve disk space When dumping heap on OOM with -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp the JVM creates a file with the following name java_pidXXXX.hprof in the specified /tmp folder (where XXXX is the PID of the process). Is there anyway to specify a different

问题 I have a handful of heap dumps that I am analyzing after the JVM has thrown OutOfMemory exceptions. I'm using Hotspot JDK 1.7 (64bit) on a Windows 2008R2 platform. The application server is a JBoss 4.2.1GA, launched via the Tanuki Java Service Wrapper. It is launched with the following arguments: wrapper.java.additional.2=-XX:MaxPermSize=256m wrapper.java.initmemory=1498 wrapper.java.maxmemory=3000 wrapper.java.additional.19=-XX:+HeapDumpOnOutOfMemoryError which translate to: -Xms1498m

问题 I'm trying to analyse a ~800mb heap dump, which requires a bigger heap than the standard for my eclipse. however, when I go to the eclipse.ini file and set a -Xmx2g (or -Xmx2048m ) I get an error "Failed to create the Java Virtual Machine". 1) yes, I have enough memory. 2) I can change it up to exactly -Xmx976m. 3) I've tried the standalone MAT analyser and it works with -Xmx1024m, not a byte more. 4) No, 1gb is not enough to analyse that heap, I get a OOM This is the eclipse error: This is

问题 I'm trying to analyse a ~800mb heap dump, which requires a bigger heap than the standard for my eclipse. however, when I go to the eclipse.ini file and set a -Xmx2g (or -Xmx2048m ) I get an error "Failed to create the Java Virtual Machine". 1) yes, I have enough memory. 2) I can change it up to exactly -Xmx976m. 3) I've tried the standalone MAT analyser and it works with -Xmx1024m, not a byte more. 4) No, 1gb is not enough to analyse that heap, I get a OOM This is the eclipse error: This is

问题 I'm trying to analyse a ~800mb heap dump, which requires a bigger heap than the standard for my eclipse. however, when I go to the eclipse.ini file and set a -Xmx2g (or -Xmx2048m ) I get an error "Failed to create the Java Virtual Machine". 1) yes, I have enough memory. 2) I can change it up to exactly -Xmx976m. 3) I've tried the standalone MAT analyser and it works with -Xmx1024m, not a byte more. 4) No, 1gb is not enough to analyse that heap, I get a OOM This is the eclipse error: This is