well, you didnt mentioned all arguments you set, but you could try to set -XX:+ScavengeBeforeFullGC and you should also think about your Objects lifecycle. how long do your applications Objects live and what size are the Objects. think about it and take a look at the following arguments -XX:NewRatio=n old/new ration (default 2) -XX:SurvivorRatio=n eden/survivor … Read more
(Note that GC tuning is extremely dependant on the environment, so there is no magic recipe.) Had a very similar issue with G1. By default, it seems to be rather badly suited for REST endpoints (again, this is only what I experienced in my direct neighborhood). What helped me was experimenting with the GC flags, … Read more
The collector splits the heap up into fixed-size regions and tracks the live data in those regions. It keeps a set of pointers — the “remembered set” — into and out of the region. When a GC is deemed necessary, it collects the regions with less live data first (hence, “garbage first”). Often, this can … Read more
The G1 garbage collector is not the default in my installation of Java, version 1.7.0_01. You can see for yourself by using with some extra command line options: > java -XX:+PrintCommandLineFlags -XX:+PrintGCDetails -version -XX:InitialHeapSize=132304640 -XX:MaxHeapSize=2116874240 -XX:ParallelGCThreads=4 -XX:+PrintCommandLineFlags -XX:+PrintGCDetails -XX:+UseCompressedOops -XX:-UseLargePagesIndividualAllocation -XX:+UseParallelGC java version “1.7.0_01” Java(TM) SE Runtime Environment (build 1.7.0_01-b08) Java HotSpot(TM) 64-Bit Server VM … Read more
I’ve been testing it out with a heavy application: 60-70GB allocated to heap, with 20-50GB in use at any time. With these sorts of applications, it’s an understatement to say that your mileage may vary. I’m running JDK 1.6_22 on Linux. The minor versions are important– before about 1.6_20, there were bugs in G1 that … Read more
You’re essentially running out of memory to run the process smoothly. Options that come to mind: Specify more memory like you mentioned, try something in between like -Xmx512m first Work with smaller batches of HashMap objects to process at once if possible If you have a lot of duplicate strings, use String.intern() on them before … Read more