JVM tuning optimizes performance and stability by adjusting parameters. Memory tuning includes setting the heap size (-Xms and -Xmx) and the young/old generation ratio (-XX:NewRatio). Garbage collection tuning includes setting up parallel garbage collection threads (-XX:ParallelGCThreads) and using the G1 garbage collector (-XX: UseG1GC). Thread tuning involves setting the thread stack size (-XX:ThreadStackSize) and the parallel garbage collector ThreadPool size (-XX:ParallelThreadPoolSize). Practical cases show that through tuning, garbage collection pause time and overall performance are significantly improved.
Java Virtual Machine (JVM) Tuning Technology
Introduction
JVM Tuning refers to adjusting the configuration parameters of the JVM to optimize the performance and stability of the application. Through tuning, the efficiency of the JVM's memory management, garbage collection, and thread behavior can be improved.
Memory Tuning
-Xmsand-Xmx: Set the initial heap size and Maximum heap size.
-Xms512m -Xmx1g
-XX:NewRatio: Set the ratio between the young generation and the old generation.
-XX:NewRatio=2
-XX:SurvivorRatio: Set the size ratio of the new generation survivor area and eden area.
-XX:SurvivorRatio=8
Garbage collection tuning
##-XX:ParallelGCThreads: Set up parallel garbage collection Threads.
-XX:ParallelGCThreads=4
-XX:ConcMarkSweepGCThreads: Set the number of concurrent mark sweep garbage collection threads.
-XX:ConcMarkSweepGCThreads=4
Thread tuning
-XX:ThreadStackSize: Set the thread stack size.
-XX:ThreadStackSize=1m
-XX:ParallelThreadPoolSize: Sets the parallel garbage collector ThreadPool size.
-XX:ParallelThreadPoolSize=8
Practical Case
Consider an application that processes large amounts of data. Through monitoring, it was found that the application often paused garbage collection for too long. For optimization, we performed the following tuning steps:-Xmx2g
-XX:NewRatio=3
-XX:+UseG1GC
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