![]() There are several kinds of dumps, but you generally need the full system dump to perform a thorough memory analysis. Add the following arguments: You’ll first have to change the default JVM settings regarding the Dump agents, to generate the correct dumps on user signal. ![]() jmap -dump:format=b,file=/path/to/generate/heapdumpfile.hprof 1234 Run the jmap command below, replace /path/to/generate/heapdumpfile.hprof with the location you would like to generate the heap dump file, and replace 1234 with the pid that you looked up in the previous step. In Windows this can be done by opening the task manager, press Ctrl+Shift+Esc then go to View then go to Select Columns then go to PID (Process Identifier) or jps -l.In Unix or Linux this can be done with ps -ef | grep java or jps -l.Look up the pid of the java process you are generating a heap dump for. To manually generate a heap dump, run this command (jmap and jps can be found in the bin folder of your jdk home directory): See here for a reference of debugging related jvm parameters. If you need to specify a different directory to generate the heap dump in due to disk space restrictions, then you can add the -XX:HeapDumpPath=/path/to/generate/heapdump parameter to tell the jvm where to put the file. Then check whether you see -XX:+HeapDumpOnOutOfMemoryError as a parameter of the CRX java process. Run ps -ef | grep java from the command-line. For example: CQ_JVM_OPTS='-XX:+HeapDumpOnOutOfMemoryError'Īfter adding this parameter and restarting the CRX instance, verify that the new jvm option is set. Note: if you are using crx-quickstart/server/start script to start your CRX instance then you can add -XX:+HeapDumpOnOutOfMemoryError to the CQ_JVM_OPTS variable (make sure that the variable is uncommented as well). Usually, one heap dump file is enough to analyze the problem. The process can continue to run after the heap dump was generated. This generates a heap dump file ( java_.hprof) in the process’s working directory whenever the java process runs out of memory. For example, java -Xmx256m -XX:+HeapDumpOnOutOfMemoryError -jar *.jar To automatically create a heap dump when running out of memory, you can add the jvm parameter -XX:+HeapDumpOnOutOfMemoryError to generate a heap dump automatically when the application throws an OutOfMemoryError. See the section below on how to analyze memory problems in java applications. This is called a memory leak, see here for more information. If this is not the case, then your application could be retaining too many objects without releasing them for Garbage Collection. If this is the problem, then starting from the command line,ensure that the heap memory settings are set. CRX or CQ need at least 256 MB of heap allocated to run. This means that the jvm parameter -Xmx was not specified. One possible cause is that the java application, in our case, CRX / CQ was started from the command line with the default heap memory settings of Java. The JAVA application runs slower and finally runs out of memory or you see an error in the logs or in the console output OutOfMemoryError: Java heap space or OutOfMemoryError: gc overhead limit exceeded. Analyze Memory Problems Description Environment
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |