PapiRunner.kt 8.11 KB
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package se.lth.cs

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import org.openjdk.jmh.infra.Blackhole
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import papi.EventSet
import papi.Papi
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import se.lth.cs.bcgen.BCBenchmarkPackage
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import se.lth.cs.papicounters.PapiBenchmarkAnalyzer
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import java.io.FileWriter
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open class PapiRunner(val numRuns: Int, counters: CounterSpecification) : PapiBenchmarkAnalyzer {
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    init {
        Papi.init()
    }
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    val counterSpec = counters

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    protected var blackhole = Blackhole("Today's password is swordfish. I understand instantiating Blackholes directly is dangerous.")

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    /**
     * Empty benchmark:
     * Test to see if the results are stable.
     */
    fun emptyBenchmark(): MutableMap<String, List<Long>> {
        // For each counter,
        // we store the values for each run (10 runs)
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        var data: MutableMap<String, List<Long>> = mutableMapOf()
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        for (kvp in counterSpec.currentSpec) {
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            val evset = EventSet.create(kvp.value)

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            val current: MutableList<Long> = mutableListOf()
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            for (warmup in 0..100) {
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                val a = (0..warmup).toList().toTypedArray()
                val b = IntArray(warmup)

                evset.start()
                // Synthetic piece of code to see if counters run as expected
                var acc = 0
                for (i in 0 until warmup) {
                    acc += a[i]
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                    if (acc % 2 == 1) {
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                        b[i] = acc
                    }
                }
                evset.stop()
                // Get data
                val currentData = evset.counters
                current.addAll(currentData.toList())
            }
            data.set(kvp.key, current)
        }
        return data
    }

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    /**
     * Creates a list of specifications of what counter to get from what benchmarks
     */
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    fun createRunSpecs(syntheticBenchmarks: List<BCBenchmarkPackage<*>>): List<PapiBenchmarkAnalyzer.RunSpec> {
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        val counters = counterSpec.currentSpec

        // Let's say we want to minimize the counter change
        // We put it in the outer loop
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        val specification = mutableListOf<PapiBenchmarkAnalyzer.RunSpec>()
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        for (c in counters) {
            val eventSet = EventSet.create(c.value)
            for (b in syntheticBenchmarks) {
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                specification.add(PapiBenchmarkAnalyzer.RunSpec(numRuns, c.key, eventSet, b))
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            }
        }
        return specification.toList()
    }

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    override fun runSpec(spec : PapiBenchmarkAnalyzer.RunSpec): List<Long> {
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        // println("Running benchmark: " + spec.syntheticBenchmark.benchmarkIdentifier)
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        val writer = FileWriter("/dev/null")
        val samples = mutableListOf<Long>()
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        for (i in 0 until spec.numRuns) {
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            val app = spec.syntheticBenchmark
            val evset = spec.eventSet
            // We do the measurements
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            app.reset(app.getDatastructureSize())
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            var accumulator = 0
            evset.start()
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            app.runBenchmark(blackhole)
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            evset.stop()
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            val resultDataStructure = app.getDatastructure()
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            // We reset the benchmark
            app.reset(0)

            // Write the result somewhere to prevent dead code elimination
            writer.write(accumulator)
            writer.write(resultDataStructure.toString())
            // We record the data
            samples.addAll(evset.counters.toList())
        }
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        writer.close()
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        return samples
    }
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    /**
     * A function for running one benchmark, gathering all the hardware counters
     * Present in the counter specification we have.
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     */
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    @Deprecated("Used only in tests??")
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    fun runApplication(app: BCBenchmarkPackage<*>) : Map<String, List<Long>> {
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        // We will write the aggregators to nowhere
        val writer = FileWriter("/dev/null")
        // We get integers for all the counters.
        val counters = counterSpec.currentSpec

        var result = mutableMapOf<String, List<Long>>()
        for (counter in counters.keys) {
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            val counterId = counterSpec.getCounter(counter)
            val evset = EventSet.create(counterId!!)
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            val samples = mutableListOf<Long>()
            for (run in 0 until numRuns) {
                // We do the measurements
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                app.reset(app.getDatastructureSize())
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                var accumulator = 0
                evset.start()
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                app.runBenchmark(blackhole)
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                evset.stop()
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                System.out.println("missed trace methods count = " + app.getMissedMethods())
                if (app.getMissedMethods() > 0) {
                    System.out.println("[XWARN:SIMMISS]: missed "
                            + Integer.toString(app.getMissedMethods())
                            + " out of "
                            + Integer.toString(app.getTrace().size) + " trace methods")
                }
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                val resultDataStructure = app.getDatastructure()
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                // We reset the benchmark
                app.reset(0)
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                // Write the result somewhere to prevent dead code elimination
                writer.write(accumulator)
                writer.write(resultDataStructure.toString())
                // We record the data
                samples.addAll(evset.counters.toList())
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            }
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            result[counter] = ArrayList(samples)
            samples.clear()
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        }
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        app.clearAll();
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        writer.close()

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        return result.toMap()
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    }

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    override fun runApplications(syntheticBenchmarks: List<BCBenchmarkPackage<*>>): List<PapiBenchmarkAnalyzer.BenchmarkRunData> {
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        // return syntheticBenchmarks.map { b -> runApplication(iterations, b) }
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        val specs = createRunSpecs(syntheticBenchmarks)
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        val numberBenchmarks = specs.size
        var i = 0
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        val samples = specs.map {
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            print("Running spec: $i / $numberBenchmarks\r")
            i++
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            runSpec(it) }
        val spectToCounters = specs.zip(samples)

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        println("Finished running specs.")
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        // We create a report for a run for each individual sample
        return spectToCounters.flatMap {
            it.second.mapIndexed { index, sample ->
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                PapiBenchmarkAnalyzer.BenchmarkRunData(it.first.syntheticBenchmark,
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                    index,
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                    it.first.counter,
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                    sample.toDouble())
            }
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        }
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    }

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    fun runApplicationsNormalized(syntheticBenchmarks: List<BCBenchmarkPackage<*>>) : List<PapiBenchmarkAnalyzer.BenchmarkRunData> {
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        val benchmarkRuns = runApplications(syntheticBenchmarks)
        val instructionsForRun = benchmarkRuns.filter { it.counter == "PAPI_TOT_INS" }
                .associate {
                    val k = Pair(it.benchmark, it.iteration)
                    val v = it.value
                    Pair(k, v)
                }
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        return benchmarkRuns.map {
            val k = Pair(it.benchmark, it.iteration)
            val numberInstructions = instructionsForRun[k]
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            PapiBenchmarkAnalyzer.BenchmarkRunData(it.benchmark, it.iteration, it.counter, it.value / numberInstructions!!)
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        }
    }

    /**
     * Normalize a map of counters by the PAPI_TOT_INS (Total number of instructions)
     * @param counters: A map from PAPI counter names to their median value
     */
    fun normalizeFeatures(counters : Map<String, Double>) : Map<String, Double> {
        val total = counters["PAPI_TOT_INS"] ?: error("'PAPI_TOT_INS' not present in counters")

        return counters.mapValues {
            it.value / total
        }
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    }
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}
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/**
 * A mockup class which returns deterministic results when you "run" a spec.
 */
class MockupPapiRunner(numRuns : Int, counters : CounterSpecification) : PapiRunner(numRuns, counters) {
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    override fun runSpec(spec : PapiBenchmarkAnalyzer.RunSpec) : List<Long> {
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        val seed = spec.syntheticBenchmark.seed
        // We map the counters to integers
        // val counterToInt = mapOf<String, Long>(
        //     Pair("PAPI_CA_ITV", 0),
        //     Pair("PAPI_L1_DCM", 1),
        //     Pair("PAPI_TOT_CYC", 2),
        //     Pair("PAPI_TOT_INS", 3)
        // )
        // val n = seed + counterToInt[spec.counter]!!
        val n = seed
        return listOf(n, n, n)
    }
}