JVM：jmap heap 堆参数分析MinHeapFreeRatio、MaxHeapFreeRatio、MaxHeapSize、NewSize、MaxNewSize

1、jmap获取堆概要信息 JDK9以前：html jmap -heap 33146 JDK9及以后：web jhsdb jmap --heap --pid 33146 执行示例：bash zhibo-mac:JavaVirtualMachines zhibo$ jhsdb jmap --heap --pid 33146 Attaching to process ID 33146, please

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