JVM：jmap heap 堆參數分析MinHeapFreeRatio、MaxHeapFreeRatio、MaxHeapSize、NewSize、MaxNewSize

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

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