问题描述
我正在尝试分析一些JMH基准.我想启用GC日志记录以查看正在生成多少垃圾，但是我无法弄清楚如何传递JVM参数.我知道JMH在派生的JVM中运行基准测试，因此，如何做到这一点对我来说并不是立即显而易见的.我正在使用 SBT .
I have some JMH benchmarks that I'm trying to analyze. I want to enable GC logging to see how much garbage is being generated, but I can't figure out how to pass JVM arguments. I know JMH runs benchmarks in a forked JVM, so it's not immediately obvious to me how to do this. I'm using SBT.
推荐答案
如果我没看错sbt-jmh文档，它将使用jmh:run ...将应用程序选项传递给JMH运行程序.因此，让JMH命令行接受--jvmArgs "..."，我将尝试执行jmh:run --jvmArgs "-XX:+PrintGCDetails".或者，如@apangin所述，添加@Fork(jvmArgsAppend = "-XX:+PrintGCDetails").
If I read sbt-jmh docs right, it passes the application options to JMH runner with jmh:run .... So, having that JMH command line accepts --jvmArgs "...", I would try to do jmh:run --jvmArgs "-XX:+PrintGCDetails". Or, as @apangin mentions, add @Fork(jvmArgsAppend = "-XX:+PrintGCDetails").
但是对于您的特定用例-查看产生了多少垃圾"-最好使用捆绑的GC分析器(由-prof gc激活)，这是更好的主意.请参见 JMHSample_35_Profilers.java#l71 .
But for your particular use case -- "see how much garbage is generated" -- it might be even better idea to use a bundled GC profiler, activated with -prof gc. See the example at JMHSample_35_Profilers.java#l71.
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