scala - 如何分析在SBT中完成任务所花费的时间

Question

我想知道为什么有时我的构建速度要慢得多。

因此，我决定测量长时间运行的任务。

当运行纯Scala代码时，这样做很容易:

def myMethod() = {
   val initTime = System.currentTimeMillis
   ...
   val elapsedTime = System.currentTimeMillis-initTime
}

但是对于像 packageBin或 compile这样的源代码我无法更改的任务，我不知道如何衡量它，因为我无法控制 someTask.value的运行时间。

有什么提示吗？

相关问题:

Profiling sbt builds

Answer 1

为了进行更完整的分析，您还可以使用 jrudolph/sbt-optimizer/

sbt-optimizer is an experimental plugin that hooks into sbt's task execution engine and offers a graphical ASCII report once a tree of tasks has been run

Add the plugin to project/plugins.sbt:

addSbtPlugin("net.virtual-void" % "sbt-optimizer" % "0.1.2")

and enable it in a project with:

enablePlugins(net.virtualvoid.optimizer.SbtOptimizerPlugin)

Each output line corresponds to one task that has been executed.

• The first time is the total time this task was running.
• The second time displayed in green is the actual execution time.
• The third time displayed in red is time the task wanted to run but was waiting for the global ivy lock.
• The last time displayed in cyan is the time the task was blocked waiting for Ivy downloads.