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Micro benchmark of using invoke (scala/jvm) in a console session
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def invoke1[T,U](obj:Any, method:Method)(param:T):U = method.invoke(obj,Seq(param.asInstanceOf[java.lang.Object]):_*) match { | |
case x: java.lang.Object if x==null => null.asInstanceOf[U] | |
case x => x.asInstanceOf[U] | |
} | |
def time[T](b: => T):(T, Long) = { | |
val t0 = System.nanoTime() | |
val res = b | |
val t = System.nanoTime() - t0 | |
(res,t ) | |
} | |
class Test { | |
def op(l:Long): Long = (2 until math.sqrt(l).toInt).filter(x=>l%x==0).sum | |
} | |
val t0 = new Test | |
val method = classOf[Test].getMethods.find(_.getName=="op").get | |
def timeDiff = { | |
val (timeDirectCall,res) = time { (0 to 1000000).map(x=>t0.op(x)) } | |
val (timeInvoke, res2) = time { (0 to 1000000).map(x=>{val res:Long=invoke1(t0,method)(x);res}) } | |
(timeInvoke-timeDirectCall).toDouble/timeDirectCall.toDouble | |
} | |
//scala> timeDiff | |
//res60: Double = 2.1428745665357445 | |
//scala> timeDiff | |
//res61: Double = 2.1604176409796683 | |
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