![]() The stack itself is split into different regions: permanent generation and code cache. We can configure the stack size per thread (each thread has its own stack) with the -Xss parameter: $ java -Xss18m somejavafile The cost of destroying a variable is free because their memory is just dropped. With memory, it is a simple matter of a move operation and a decrement/increment operation on the stack register. It’s where local variables get stored and destroyed and operates quickly thanks to its strictly last-in, first-out design. The stack is the part of the memory that contains information about function calls. ![]() To monitor Java memory usage, you need to understand the differences between these memory data zones and the specific behavior of each. The memory can be split into two different parts: stack and heap. You need to profile the memory usage over time to avoid leaks and be able to troubleshoot unexpected service degradation. One of the most important Java resources to monitor and profile is memory consumption. The Java Runtime Environment (JRE) that we’ll be discussing today contains a lot of general information about how your application is doing including, CPU usage, number of threads running, number of classes loaded, garbage collector information, memory usage, and other relevant metrics. Click to tweet Monitoring Java application performance through JRE metrics Advanced #Java #JRE monitoring: memory, garbage collector and threads, learn the basic concepts and metrics to watch.
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