Created
June 19, 2010 10:58
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| /** | |
| * Start of a framework for measuring perfromance and reporting the results. | |
| */ | |
| // TODO: Some tool for iterating through classes in source dirs and running the ones inheriting the performance test trait. | |
| // TODO: Refactor this to be unit test like instead with an overrideable setup method and reflection found test methods, this current approach seems clumsy to use | |
| final case class PerformanceProfiler[T]( subject : String ) { | |
| var warmupRounds = 5 | |
| var testRounds = 10 | |
| private var tests : List[(String,Unit=>T,T=>Unit)] = Nil | |
| def addTest( testName : String, setup: Unit => T) (performanceTest : T => Unit ) { | |
| tests = tests ::: List( (testName, setup.asInstanceOf[Unit => T], performanceTest.asInstanceOf[T => Unit]) ) | |
| } | |
| def runTestsAndPrintResults() { | |
| println( "Running "+tests.size+" performance test"+(if(tests.size!=1) "s" else "")+" for " + subject + "\n ..." ) | |
| println( runTests ) | |
| } | |
| def runTests() : String = { | |
| makeSummaryReport( subject, | |
| tests map { case (testName : String, setup : (Unit=>T), test : (T=>Unit)) => | |
| // Warm up the JVM -- that is, allow the Just In Time compiler to optimize the code for the tested block. | |
| runTest(warmupRounds, setup, test) | |
| // Do the actual test runs and construct test report | |
| makeTestReport( testName, runTest(testRounds, setup, test)) | |
| } ) | |
| } | |
| /** | |
| * Gets a list of test run durations in seconds, and creates a report. | |
| */ | |
| def makeTestReport( testName : String, durations : Seq[Double]) : String = { | |
| " " + testName + "\n"+ | |
| " Numer of rounds: " + durations.size + "\n" + | |
| " Average duration: " + 1000.0 * (durations.sum / durations.size) + " ms\n" + | |
| /* | |
| " Round durations:\n" + | |
| " " + durations.mkString( " s\n " ) + (if (durations.size>0) "s" else "") + | |
| */ | |
| "\n" | |
| } | |
| /** | |
| * Gets a list of test run durations in seconds, and creates a report. | |
| */ | |
| def makeSummaryReport( subject : String, testReports : Seq[String]) : String = { | |
| "Performance measure of " + subject + "\n" + | |
| " Number of tests: " + testReports.size + "\n"+ | |
| " Test results:\n" + testReports.mkString( "\n" ) + "\n" | |
| } | |
| /** | |
| * Returns the durations of each test run in seconds. | |
| */ | |
| def runTest( numberOfRuns : Int, setup : (Unit=>T), test : (T=>Unit) ) : Seq[Double] = { | |
| 1 to numberOfRuns map { i => | |
| val testData = setup() | |
| val startTime_ns = System.nanoTime | |
| test( testData ) | |
| val endTime_ns = System.nanoTime | |
| // Convert to seconds from nanoseconds: | |
| (1.0*(endTime_ns - startTime_ns) / 1.0e9).toDouble | |
| } | |
| } | |
| } |
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