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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftNIO open source project
//
// Copyright (c) 2021 Apple Inc. and the SwiftNIO project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftNIO project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
import Foundation
import NIOCore
import NIOPosix
final class RunIfActiveBenchmark: Benchmark {
private var threadPool: NIOThreadPool!
private var loop: EventLoop!
private var dg: DispatchGroup!
private var counter = 0
private let numThreads: Int
private let numTasks: Int
init(numThreads: Int, numTasks: Int) {
self.numThreads = numThreads
self.numTasks = numTasks
}
func setUp() throws {
self.threadPool = NIOThreadPool(numberOfThreads: self.numThreads)
self.threadPool.start()
// Prewarm the internal NIOThreadPool request queue, to avoid CoW
// work during the test runs.
let semaphore = DispatchSemaphore(value: 0)
let eventLoop = MultiThreadedEventLoopGroup.singleton.any()
let futures = (0..<self.numTasks).map { _ in
return self.threadPool.runIfActive(eventLoop: eventLoop) {
// Hold back all the work items, until they all got scheduled
semaphore.wait()
}
}
(0..<self.numTasks).forEach { _ in
semaphore.signal()
}
_ = try EventLoopFuture.whenAllSucceed(futures, on: eventLoop).wait()
}
func tearDown() {
try! self.threadPool.syncShutdownGracefully()
}
func run() -> Int {
let eventLoop = MultiThreadedEventLoopGroup.singleton.any()
let futures = (0..<self.numTasks).map { _ in
return self.threadPool.runIfActive(eventLoop: eventLoop) {
// Empty work item body
}
}
_ = try! EventLoopFuture.whenAllSucceed(futures, on: eventLoop).wait()
return 0
}
}
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