59 lines
2.2 KiB
Kotlin
59 lines
2.2 KiB
Kotlin
/*
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* Copyright (C) 2021 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.testapp
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class TimingTracker(
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private val numberOfIterations: Int = 1,
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private var numberOfIterationsToIgnore: Int = 0
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) {
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init {
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require(numberOfIterations > numberOfIterationsToIgnore)
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}
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private val timings = mutableMapOf<String, IntArray>()
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private var currentIteration: Int = 0
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fun nextIteration() {
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currentIteration++
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}
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fun <T> measure(name: String, workToTime: () -> T): T {
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val start = System.nanoTime()
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val t = workToTime()
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if (currentIteration >= numberOfIterationsToIgnore) {
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val end = System.nanoTime()
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val deltaInMicroseconds: Int = ((end - start) / 1000).toInt()
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val timing = timings.getOrPut(name) {
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IntArray(numberOfIterations - numberOfIterationsToIgnore)
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}
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timing[currentIteration - numberOfIterationsToIgnore] += deltaInMicroseconds
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}
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return t
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}
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fun report(): String {
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var minimum: Int = Int.MAX_VALUE
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for (timing in timings.values) {
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val m = timing.minOrNull()
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if (m != null && m < minimum) minimum = m
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}
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println(timings.map { (name, timing) -> name + ": " + timing.minOrNull() }.joinToString(separator = "\n"))
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return (timings.map { (name, timing) -> name + ": " + timing.joinToString() }.joinToString() + "\n\n" +
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timings.map { (name, timing) -> name + ": " + timing.joinToString { "%.2f".format(it.toFloat() / minimum) } }.joinToString() + "\n\n" +
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timings.map { (name, timing) -> name + ": " + timing.minOrNull() }.joinToString())
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}
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}
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