JVM调优实践⼀JVM调优准备⼯作1.机器环境机器CPU内存单机4C16G2.默认启动参数JAVA OPT JAVA OPT server Xms512m Xmx512m Xmn256XX MetaspaceSiz e128m XX MaxMetaspaceSize320m JAVA OPT JAVA OPT XX PrintGCDetails XX PrintGCTimeStamps XX Pr intGCDateStamps XX PrintHeapAtGC Xloggc BASE DIR logs gc.log