68 lines
1.6 KiB
Swift
68 lines
1.6 KiB
Swift
//
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// FrameProcessorPerformanceDataCollector.swift
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// VisionCamera
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//
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// Created by Marc Rousavy on 30.08.21.
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// Copyright © 2021 mrousavy. All rights reserved.
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//
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import Foundation
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// keep a maximum of `maxSampleSize` historical performance data samples cached.
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private let maxSampleSize = 15
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// MARK: - PerformanceSampleCollection
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struct PerformanceSampleCollection {
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var endPerformanceSampleCollection: () -> Void
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init(end: @escaping () -> Void) {
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endPerformanceSampleCollection = end
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}
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}
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// MARK: - FrameProcessorPerformanceDataCollector
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class FrameProcessorPerformanceDataCollector {
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private var performanceSamples: [Double] = []
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private var counter = 0
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private var lastEvaluation = -1
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var hasEnoughData: Bool {
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return !performanceSamples.isEmpty
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}
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var averageExecutionTimeSeconds: Double {
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let sum = performanceSamples.reduce(0, +)
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let average = sum / Double(performanceSamples.count)
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lastEvaluation = counter
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return average
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}
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func beginPerformanceSampleCollection() -> PerformanceSampleCollection {
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let begin = DispatchTime.now()
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return PerformanceSampleCollection {
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let end = DispatchTime.now()
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let seconds = Double(end.uptimeNanoseconds - begin.uptimeNanoseconds) / 1_000_000_000.0
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let index = self.counter % maxSampleSize
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if self.performanceSamples.count > index {
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self.performanceSamples[index] = seconds
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} else {
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self.performanceSamples.append(seconds)
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}
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self.counter += 1
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}
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}
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func clear() {
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counter = 0
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performanceSamples.removeAll()
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}
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}
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