如何以编程方式拦截GC以将信息打印到我的日志中 [英] How to programmatically intercept the GC to print information to my log

问题描述

我知道你可以使用-verbosegc将关于GC的信息打印到sysout，但我不想那么做。我希望截获每当GC触发并打印有关它的信息到我的自定义记录器，也许保存上一个GC时间戳在一个内部变量等。

这里有任何希望吗？解决方案

您无法在Java程序中挂接GC日志记录机制，因为当GC线程运行JVM时有效停止。这样做会导致僵局，所以它是我们不能做的一件好事。即使使用自定义启动器尝试通过某个句柄重新打开钩子并调用Java并挂钩也会陷入僵局。也许如果从自定义启动器中重新打开是可能的（我不知道这种方式或其他），缓冲数据并通过JNI从Java跳转到本地以检索缓冲区可能会有效。

I am aware that you can use the -verbosegc to print information about the GC to the sysout but I don't want that. I want to intercept whenever GC triggers and print information about it to my custom logger, perhaps save last GC timestamp on a internal variable, etc.

Any hope here?

解决方案

You can't hook the GC logging mechanism from within a Java program because when the GC thread(s) run the JVM is effectively stopped. Doing so would cause a deadlock so its a good thing we can't. Even using a custom launcher to try and hook via some handle reopen technique and calling up to Java would deadlock. Maybe if a reopen from within a custom launcher was possible (I don't know one way or the other) buffering the data and jumping from Java to native via JNI to retrieve the buffer might work.

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