However this reciprocity might be good for small to medium memory pools but not for large ones. The official recommendation for “Young Generation” is to occupy 30% of the total heap space with the young generation further subdivided into 20% for survivor spaces and 80% for eden. the “Young generation” is further subdivided in: (replaced with Metaspace in Java 8 )Īs can be seen from Figure 1. Many administrators do not realize the fact that HotSpot JVM prior to Java 8 has three memory buckets that we have to address when sizing the memory : Loosing the race and long memory cleanup cycles Neglecting some of them might lead to undesired behavior that might severely affect our production environment that can lead to server crash situation. We will see how these options are effecting the behavior of the WebLogic platform tremendously.
ORACLE COHERENCE SLOW INITIALIZE HOW TO
In the first section of this article we will address various JVM command line options and how to set them up properly. In that context we will examine some common configuration problems and how to address them like: choosing proper garbage collector and PermGen Java bucket misconfiguration for Java versions prior Java 8. When configuring server startup parameters a lot of thing have to be taken in consideration: memory and processor availability within physical or virtual machine, perceived need for resources by software running on application server, type of software running, level of network usage, etc.
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