Re: using testing.Benchmark with SBT

[Mads Hartmann Jensen]

Aleksandar Prokopec helped me with a variation of the following configuration. You would then run it using `> 
runbench com.sidewayscoding.benchmark.MutableMultisetBench 100` to run the  MutableMultisetBench benchmark 100 times

import sbt._

import Keys._

import Process._

import java.io.File

object Multisets extends Build {

 /* tasks and settings */

 val javaCommand = TaskKey[String](

   "java-command",

   "Creates a java vm command for launching a process.")

 val javaCommandSetting = javaCommand <<= (

   dependencyClasspath in Compile,

   artifactPath in (Compile, packageBin),

   artifactPath in (Test, packageBin),

   packageBin in Compile,

   packageBin in Test

 ) map {

   (dp, jar, testjar, pbc, pbt) =>

   val javacommand = "java -Xmx2048m -Xms2048m -verbose:gc -server -cp %s:%s:%s:%s:%s".format(

     dp.map(_.data).mkString(":"), jar, testjar, pbc, pbt)

   javacommand

 }

 val runBenchTask = InputKey[Unit]("runbench", "Runs the benchmark.") <<= inputTask {

   (argTask: TaskKey[Seq[String]]) => (argTask, javaCommand) map { (args, jc) =>

     val javacommand = jc

     val comm = javacommand + " " + args.mkString(" ")

     println("Executing: " + comm)

     comm!

   }

 }

 /* projects */

 lazy val project = Project(

   "Multisets",

   file("."),

   settings = Defaults.defaultSettings ++ Seq(runBenchTask, javaCommandSetting)

 ) dependsOn ()

}