all tasks

Task/Time-a-function/Groovy/time-a-function-1.groovy

@@ -0,0 +1,12 @@
+import java.lang.management.ManagementFactory
+import java.lang.management.ThreadMXBean
+
+def threadMX = ManagementFactory.threadMXBean
+assert threadMX.currentThreadCpuTimeSupported
+threadMX.threadCpuTimeEnabled = true
+
+def clockCpuTime = { Closure c ->
+    def start = threadMX.currentThreadCpuTime
+    c.call()
+    (threadMX.currentThreadCpuTime - start)/1000000
+}

Task/Time-a-function/Groovy/time-a-function-2.groovy

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+def clockRealTime = { Closure c ->
+    def start = System.currentTimeMillis()
+    c.call()
+    System.currentTimeMillis() - start
+}

Task/Time-a-function/Groovy/time-a-function-3.groovy

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+def countTo = { Long n ->
+    long i = 0; while(i < n) { i += 1L }
+}
+
+["CPU time":clockCpuTime, "wall clock time":clockRealTime].each { measurementType, timer ->
+    println '\n'
+    [100000000L, 1000000000L].each { testSize ->
+        def measuredTime = timer(countTo.curry(testSize))
+        println "Counting to ${testSize} takes ${measuredTime}ms of ${measurementType}"
+    }
+}