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seo建站营销,网站外链接自己可以怎么做,国外服务器电商网站,关键词seo教程一、先回顾一下以前《手搓》线程池CaseConcurrencyLevel设置为10并发实现了完美的指数递进关系当时内心还是得到了很大的满足第一批01:58:55.832是1个并发第二批01:58:55.944是2个并发第三批01:58:56.054是4个并发第四批01:58:56.165是8个并发01:58:56.276及以后一段时间达到并…一、先回顾一下以前《手搓》线程池CaseConcurrencyLevel设置为10并发实现了完美的指数递进关系当时内心还是得到了很大的满足第一批01:58:55.832是1个并发第二批01:58:55.944是2个并发第三批01:58:56.054是4个并发第四批01:58:56.165是8个并发01:58:56.276及以后一段时间达到并发上限10个参考笔者博文《手搓》线程池var options new ReduceOptions { ConcurrencyLevel 10 };var scheduler new ConcurrentTaskScheduler(options);var factory new TaskFactory(scheduler);var jobService new ConcurrentJobService(scheduler, options);jobService.Start();Start(factory);private void Start(TaskFactory factory){for (int i 1; i 10; i){for (int j 1; j 10; j){int a i, b j;factory.StartNew(() Multiply(a, b));}}}public int Multiply(int a, int b){var result a * b;_output.WriteLine(${a} x {b} {result},{DateTime.Now:HH:mm:ss.fff});Thread.Sleep(100);return result;}// 1 x 1 1,01:58:55.832// 1 x 2 2,01:58:55.944// 1 x 3 3,01:58:55.944// 1 x 4 4,01:58:56.054// 1 x 5 5,01:58:56.054// 1 x 6 6,01:58:56.054// 1 x 7 7,01:58:56.054// 1 x 8 8,01:58:56.165// 1 x 9 9,01:58:56.165// 2 x 1 2,01:58:56.165// 2 x 3 6,01:58:56.165// 2 x 2 4,01:58:56.165// 2 x 4 8,01:58:56.165// 2 x 5 10,01:58:56.165// 2 x 6 12,01:58:56.165// 2 x 8 16,01:58:56.276// 2 x 9 18,01:58:56.276// 3 x 2 6,01:58:56.276// 2 x 7 14,01:58:56.276// 3 x 3 9,01:58:56.276// 3 x 1 3,01:58:56.276// 3 x 4 12,01:58:56.276// 3 x 5 15,01:58:56.276// 3 x 6 18,01:58:56.277// 3 x 7 21,01:58:56.277// 4 x 1 4,01:58:56.388// 3 x 8 24,01:58:56.388// 3 x 9 27,01:58:56.388// 4 x 2 8,01:58:56.388// 4 x 6 24,01:58:56.388// 4 x 3 12,01:58:56.388// 4 x 5 20,01:58:56.388// 4 x 8 32,01:58:56.388// 4 x 4 16,01:58:56.388// 4 x 7 28,01:58:56.388// 5 x 8 40,01:58:56.500// 5 x 4 20,01:58:56.500// 5 x 9 45,01:58:56.500// 5 x 2 10,01:58:56.500// 5 x 7 35,01:58:56.500// 5 x 6 30,01:58:56.500// 4 x 9 36,01:58:56.500// 5 x 5 25,01:58:56.500// 5 x 1 5,01:58:56.500// 5 x 3 15,01:58:56.500// 6 x 5 30,01:58:56.612// 6 x 2 12,01:58:56.612// 6 x 1 6,01:58:56.612// 6 x 3 18,01:58:56.612// 6 x 6 36,01:58:56.612// 6 x 7 42,01:58:56.612// 6 x 4 24,01:58:56.612// 6 x 8 48,01:58:56.612// 6 x 9 54,01:58:56.612// 7 x 1 7,01:58:56.612// 7 x 2 14,01:58:56.724// 8 x 1 8,01:58:56.724// 7 x 4 28,01:58:56.724// 7 x 7 49,01:58:56.724// 7 x 5 35,01:58:56.724// 8 x 2 16,01:58:56.724// 7 x 8 56,01:58:56.724// 7 x 6 42,01:58:56.724// 7 x 9 63,01:58:56.724// 7 x 3 21,01:58:56.724// 8 x 5 40,01:58:56.836// 8 x 8 64,01:58:56.836// 9 x 1 9,01:58:56.836// 9 x 2 18,01:58:56.836// 8 x 7 56,01:58:56.836// 8 x 9 72,01:58:56.836// 8 x 3 24,01:58:56.836// 8 x 6 48,01:58:56.836// 9 x 3 27,01:58:56.836// 8 x 4 32,01:58:56.836// 9 x 5 45,01:58:56.948// 9 x 7 63,01:58:56.948// 9 x 4 36,01:58:56.948// 9 x 6 54,01:58:56.948// 9 x 9 81,01:58:56.948// 9 x 8 72,01:58:56.948二、短暂的快乐被异步并发测试给打破了ConcurrencyLevel设置为4一开始就是4个清晰可见的并发一发入魂,开局即是高潮第一感觉是bug第二感觉是偶发事件笔者多次测试,并反复Review代码,都没发现其中的蹊跷参考笔者博文《手搓》TaskFactory带你安全的起飞var options new ReduceOptions { ConcurrencyLevel 4 };var factory new ConcurrentTaskFactory(options);_output.WriteLine($begin {DateTime.Now:HH:mm:ss.fff});Stopwatch sw Stopwatch.StartNew();ListTaskProduct tasks new(100);for (int i 0; i 100; i){var id i;var task factory.StartTask(() GetProductAsync(id));tasks.Add(task);}var products await Task.WhenAll(tasks);sw.Stop();_output.WriteLine($end {DateTime.Now:HH:mm:ss.fff}, Elapsed {sw.ElapsedMilliseconds});Assert.NotNull(products);Assert.Equal(100, products.Length);// begin 10:20:45.317// Thread36 GetProductAsync(0),10:20:45.487// Thread11 GetProductAsync(2),10:20:45.487// Thread8 GetProductAsync(3),10:20:45.487// Thread35 GetProductAsync(1),10:20:45.487// Thread11 GetProductAsync(6),10:20:45.614// Thread35 GetProductAsync(4),10:20:45.614// Thread8 GetProductAsync(7),10:20:45.614// Thread36 GetProductAsync(5),10:20:45.614// Thread35 GetProductAsync(9),10:20:45.742// Thread8 GetProductAsync(8),10:20:45.742// Thread41 GetProductAsync(11),10:20:45.742// Thread37 GetProductAsync(10),10:20:45.742// Thread37 GetProductAsync(12),10:20:45.869// Thread8 GetProductAsync(14),10:20:45.869// Thread11 GetProductAsync(13),10:20:45.869// Thread41 GetProductAsync(15),10:20:45.869// Thread8 GetProductAsync(18),10:20:45.997// Thread35 GetProductAsync(17),10:20:45.997// Thread41 GetProductAsync(19),10:20:45.997// Thread11 GetProductAsync(16),10:20:45.997// Thread11 GetProductAsync(20),10:20:46.125// Thread8 GetProductAsync(22),10:20:46.125// Thread35 GetProductAsync(21),10:20:46.125// Thread41 GetProductAsync(23),10:20:46.125// Thread37 GetProductAsync(27),10:20:46.253// Thread41 GetProductAsync(26),10:20:46.253// Thread35 GetProductAsync(25),10:20:46.253// Thread11 GetProductAsync(24),10:20:46.253// Thread35 GetProductAsync(29),10:20:46.381// Thread41 GetProductAsync(28),10:20:46.381// Thread11 GetProductAsync(31),10:20:46.381// Thread37 GetProductAsync(30),10:20:46.381// Thread8 GetProductAsync(32),10:20:46.507// Thread37 GetProductAsync(34),10:20:46.507// Thread41 GetProductAsync(35),10:20:46.507// Thread11 GetProductAsync(33),10:20:46.507// Thread37 GetProductAsync(39),10:20:46.635// Thread11 GetProductAsync(37),10:20:46.635// Thread41 GetProductAsync(36),10:20:46.635// Thread35 GetProductAsync(38),10:20:46.635// Thread41 GetProductAsync(40),10:20:46.763// Thread37 GetProductAsync(41),10:20:46.763// Thread35 GetProductAsync(42),10:20:46.763// Thread11 GetProductAsync(43),10:20:46.763// Thread41 GetProductAsync(47),10:20:46.891// Thread8 GetProductAsync(44),10:20:46.891// Thread11 GetProductAsync(46),10:20:46.891// Thread37 GetProductAsync(45),10:20:46.891// Thread37 GetProductAsync(51),10:20:47.018// Thread8 GetProductAsync(49),10:20:47.018// Thread41 GetProductAsync(48),10:20:47.018// Thread11 GetProductAsync(50),10:20:47.018// Thread41 GetProductAsync(55),10:20:47.146// Thread11 GetProductAsync(54),10:20:47.146// Thread8 GetProductAsync(52),10:20:47.146// Thread37 GetProductAsync(53),10:20:47.146// Thread11 GetProductAsync(59),10:20:47.274// Thread8 GetProductAsync(58),10:20:47.274// Thread37 GetProductAsync(56),10:20:47.274// Thread41 GetProductAsync(57),10:20:47.274// Thread41 GetProductAsync(62),10:20:47.402// Thread11 GetProductAsync(63),10:20:47.402// Thread37 GetProductAsync(60),10:20:47.402// Thread8 GetProductAsync(61),10:20:47.402// Thread41 GetProductAsync(66),10:20:47.530// Thread88 GetProductAsync(64),10:20:47.530// Thread35 GetProductAsync(65),10:20:47.530// Thread11 GetProductAsync(67),10:20:47.530// Thread11 GetProductAsync(68),10:20:47.658// Thread41 GetProductAsync(70),10:20:47.658// Thread8 GetProductAsync(69),10:20:47.658// Thread35 GetProductAsync(71),10:20:47.658// Thread41 GetProductAsync(74),10:20:47.786// Thread95 GetProductAsync(75),10:20:47.786// Thread35 GetProductAsync(73),10:20:47.786// Thread88 GetProductAsync(72),10:20:47.786// Thread95 GetProductAsync(78),10:20:47.914// Thread41 GetProductAsync(77),10:20:47.914// Thread88 GetProductAsync(79),10:20:47.914// Thread8 GetProductAsync(76),10:20:47.914// Thread95 GetProductAsync(80),10:20:48.042// Thread41 GetProductAsync(83),10:20:48.042// Thread8 GetProductAsync(82),10:20:48.042// Thread35 GetProductAsync(81),10:20:48.042// Thread95 GetProductAsync(84),10:20:48.170// Thread35 GetProductAsync(86),10:20:48.170// Thread41 GetProductAsync(85),10:20:48.170// Thread8 GetProductAsync(87),10:20:48.170// Thread11 GetProductAsync(90),10:20:48.297// Thread88 GetProductAsync(88),10:20:48.297// Thread8 GetProductAsync(89),10:20:48.297// Thread35 GetProductAsync(91),10:20:48.297// Thread11 GetProductAsync(95),10:20:48.425// Thread8 GetProductAsync(94),10:20:48.425// Thread41 GetProductAsync(93),10:20:48.425// Thread35 GetProductAsync(92),10:20:48.425// Thread41 GetProductAsync(98),10:20:48.553// Thread35 GetProductAsync(99),10:20:48.553// Thread8 GetProductAsync(97),10:20:48.553// Thread88 GetProductAsync(96),10:20:48.553// end 10:20:48.553, Elapsed 3235三、进一步优化的空间傍晚在小区边的小湖散步就反复思考异步并发的问题如果把异步线程等同同步线程,在异步线程未执行完就激活了新的线程由于激活前这个过程足够快导致线程叠加造成开局即是高潮的假象1. 《手搓》线程池核心代码异步时_processor.Run的耗时可以忽略不计如何能实现同步和异步同样的效果while (true){if (_processor.Run()){_pool.Increment();}else{await Task.Delay(_reduceTime, CancellationToken.None).ConfigureAwait(false);}if (token.IsCancellationRequested)break;}2. 以上想明白后就好优化了优化后的代码把_processor.Run()拆分processor.TryTake(out var item)和processor.Run(ref item)先发现任务,激活线程再执行有人可能会说,你这代码逻辑有问题啊发现任务也只是证明本线程有事可干,激活新线程明显浪费资源啊这点确实应该说一下现实经验告诉我们,如果发现1只蟑螂,很可能你家已经成为了蟑螂窝就算激活一个线程没事可干消耗也不大,TryTake返回false就直接走线程回收逻辑了while (true){if (processor.TryTake(out var item)){_pool.Increment();processor.Run(ref item);}else{await Task.Delay(_reduceTime, CancellationToken.None).ConfigureAwait(false);}if (token.IsCancellationRequested)break;}3. 优化后再把第一个同步Case重跑一遍ConcurrencyLevel设置为10同步方法也实现了一发入魂,开局即是高潮必需承认完美的指数递进关系很有数学美但笔者做为一个码奴,追求程序性能才是终极目标var options new ReduceOptions { ConcurrencyLevel 10 };var scheduler new ConcurrentTaskScheduler(options);var factory new TaskFactory(scheduler);var jobService new ConcurrentJobService(scheduler, options);jobService.Start();Start(factory);private void Start(TaskFactory factory){for (int i 1; i 10; i){for (int j 1; j 10; j){int a i, b j;factory.StartNew(() Multiply(a, b));}}}public int Multiply(int a, int b){var result a * b;_output.WriteLine(${a} x {b} {result},{DateTime.Now:HH:mm:ss.fff});Thread.Sleep(100);return result;}// 1 x 6 6,09:15:35.332// 1 x 3 3,09:15:35.332// 1 x 2 2,09:15:35.332// 1 x 4 4,09:15:35.332// 1 x 5 5,09:15:35.332// 1 x 9 9,09:15:35.333// 1 x 7 7,09:15:35.333// 1 x 8 8,09:15:35.333// 1 x 1 1,09:15:35.332// 2 x 1 2,09:15:35.333// 2 x 6 12,09:15:35.443// 2 x 3 6,09:15:35.443// 2 x 7 14,09:15:35.443// 2 x 4 8,09:15:35.443// 2 x 8 16,09:15:35.443// 2 x 5 10,09:15:35.443// 2 x 2 4,09:15:35.443// 2 x 9 18,09:15:35.443// 3 x 1 3,09:15:35.443// 3 x 2 6,09:15:35.444// 4 x 3 12,09:15:35.554// 3 x 4 12,09:15:35.554// 3 x 5 15,09:15:35.554// 3 x 3 9,09:15:35.554// 3 x 7 21,09:15:35.554// 3 x 9 27,09:15:35.554// 4 x 1 4,09:15:35.554// 3 x 8 24,09:15:35.554// 3 x 6 18,09:15:35.554// 4 x 2 8,09:15:35.554// 4 x 6 24,09:15:35.666// 5 x 4 20,09:15:35.666// 4 x 8 32,09:15:35.666// 4 x 9 36,09:15:35.666// 4 x 7 28,09:15:35.666// 5 x 3 15,09:15:35.666// 4 x 4 16,09:15:35.666// 5 x 2 10,09:15:35.666// 5 x 1 5,09:15:35.666// 4 x 5 20,09:15:35.666// 5 x 6 30,09:15:35.777// 6 x 1 6,09:15:35.777// 6 x 5 30,09:15:35.777// 6 x 4 24,09:15:35.777// 5 x 9 45,09:15:35.777// 5 x 5 25,09:15:35.777// 6 x 2 12,09:15:35.777// 5 x 8 40,09:15:35.777// 5 x 7 35,09:15:35.777// 6 x 3 18,09:15:35.777// 6 x 9 54,09:15:35.888// 6 x 8 48,09:15:35.888// 7 x 1 7,09:15:35.888// 6 x 7 42,09:15:35.888// 6 x 6 36,09:15:35.888// 7 x 6 42,09:15:35.888// 7 x 4 28,09:15:35.888// 7 x 3 21,09:15:35.888// 7 x 5 35,09:15:35.888// 7 x 2 14,09:15:35.888// 7 x 8 56,09:15:36.000// 7 x 7 49,09:15:36.000// 7 x 9 63,09:15:36.000// 8 x 1 8,09:15:36.000// 8 x 7 56,09:15:36.000// 8 x 2 16,09:15:36.000// 8 x 3 24,09:15:36.000// 8 x 5 40,09:15:36.000// 8 x 6 48,09:15:36.000// 8 x 4 32,09:15:36.000// 8 x 8 64,09:15:36.112// 8 x 9 72,09:15:36.112// 9 x 2 18,09:15:36.112// 9 x 1 9,09:15:36.112// 9 x 3 27,09:15:36.112// 9 x 4 36,09:15:36.112// 9 x 5 45,09:15:36.112// 9 x 7 63,09:15:36.112// 9 x 6 54,09:15:36.112// 9 x 8 72,09:15:36.112// 9 x 9 81,09:15:36.2234. 线程池执行同步方法开局即是高潮重要吗当然重要,这就是冷启动的速度问题如果用TaskFactory对同步方法做并发操作就更显得重要了GetProduct同步方法执行1次耗时0.1秒ConcurrencyLevel设置为7现在优化后获取7条只要0.1秒如果冷启动按指数递进关系至少要0.3秒多这就快了3倍如果ConcurrencyLevel越大,效果就越明显var options new ReduceOptions { ConcurrencyLevel 7 };var factory new ConcurrentTaskFactory(options);_output.WriteLine($begin {DateTime.Now:HH:mm:ss.fff});Stopwatch sw Stopwatch.StartNew();ListTaskProduct tasks new(7);for (int i 0; i 7; i){var id i;var task factory.StartNew(() GetProduct(id));tasks.Add(task);}var products await Task.WhenAll(tasks);sw.Stop();_output.WriteLine($end {DateTime.Now:HH:mm:ss.fff}, Elapsed {sw.ElapsedMilliseconds});internal Product GetProduct(int id){Thread.Sleep(100);_output.WriteLine($Thread{Environment.CurrentManagedThreadId} GetProductAsync({id}),{DateTime.Now:HH:mm:ss.fff});return new(id);}// begin 09:52:02.916// Thread36 GetProductAsync(5),09:52:03.079// Thread32 GetProductAsync(1),09:52:03.079// Thread33 GetProductAsync(2),09:52:03.079// Thread37 GetProductAsync(6),09:52:03.079// Thread34 GetProductAsync(3),09:52:03.079// Thread35 GetProductAsync(4),09:52:03.079// Thread8 GetProductAsync(0),09:52:03.079// end 09:52:03.079, Elapsed 162