memory - Jmapping 的基础知识？

Question

我已经在那里做了一些搜索，但找不到太多真正有用的信息，但是有人可以尝试解释 Java 内存映射的基础知识吗？比如在哪里/如何使用它，它的目的，也许还有一些语法示例(输入/输出类型)？我很快就要参加 Java 测试，这可能是主题之一，但在我的所有教程中，Jmap 都没有出现。提前致谢

编辑:我指的是工具:jmap

Answer 1

我会阅读您引用的手册页。

jmap prints shared object memory maps or heap memory details of a given process or core file or a remote debug server.

NOTE: This utility is unsupported and may or may not be available in future versions of the JDK. In Windows Systems where dbgeng.dll is not present, 'Debugging Tools For Windows' needs to be installed to have these tools working. Also, PATH environment variable should contain the location of jvm.dll used by the target process or the location from which the Crash Dump file was produced.

http://docs.oracle.com/javase/7/docs/technotes/tools/share/jmap.html

它不是一个可以轻易使用的工具。您需要一个好的分析器来读取它的输出，因为 jhat 仅对简单的程序有用。 (YourKit 适用于 1+ GB 堆)