为什么我的破坏者的例子如此缓慢？

时间：2012-11-11 19:49:44

标签： c# disruptor-pattern

我从Stack Overflow问题 Disruptor.NET example 中获取了代码示例，并将其修改为“测量”时间。完整列表如下：

using System;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Disruptor;
using Disruptor.Dsl;

namespace DisruptorTest
{
    public sealed class ValueEntry
    {
        public long Value { get; set; }

        public ValueEntry()
        {
            Console.WriteLine("New ValueEntry created");
        }
    }

    public class ValueAdditionHandler : IEventHandler<ValueEntry>
    {
        public void OnNext(ValueEntry data, long sequence, bool endOfBatch)
        {
            Program.sw.Stop();
            long microseconds = Program.sw.ElapsedTicks / (Stopwatch.Frequency / (1000L * 1000L));
            Console.WriteLine("elapsed microseconds = " + microseconds);
            Console.WriteLine("Event handled: Value = {0} (processed event {1}", data.Value, sequence);
        }
    }

    class Program
    {
        public static Stopwatch sw = Stopwatch.StartNew();

        private static readonly Random _random = new Random();
        private static readonly int _ringSize = 16;  // Must be multiple of 2

        static void Main(string[] args)
        {
            var disruptor = new Disruptor.Dsl.Disruptor<ValueEntry>(() => new ValueEntry(), _ringSize, TaskScheduler.Default);

            disruptor.HandleEventsWith(new ValueAdditionHandler());

            var ringBuffer = disruptor.Start();

            while (true)
            {
                var valueToSet = _random.Next();
                long sequenceNo = ringBuffer.Next();

                ValueEntry entry = ringBuffer[sequenceNo];

                entry.Value = valueToSet;

                sw.Restart();
                ringBuffer.Publish(sequenceNo);

                Console.WriteLine("Published entry {0}, value {1}", sequenceNo, entry.Value);

                Thread.Sleep(1000);
            }
        }
    }
}

输出是：

New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
New ValueEntry created
Published entry 0, value 1510145842
elapsed microseconds = 2205
Event handled: Value = 1510145842 (processed event 0
Published entry 1, value 1718075893
elapsed microseconds = 85
Event handled: Value = 1718075893 (processed event 1
Published entry 2, value 1675907645
elapsed microseconds = 32
Event handled: Value = 1675907645 (processed event 2
Published entry 3, value 1563009446
elapsed microseconds = 75
Event handled: Value = 1563009446 (processed event 3
Published entry 4, value 1782914062
elapsed microseconds = 34
Event handled: Value = 1782914062 (processed event 4
Published entry 5, value 1516398244
elapsed microseconds = 50
Event handled: Value = 1516398244 (processed event 5
Published entry 6, value 76829327
elapsed microseconds = 50
Event handled: Value = 76829327 (processed event 6

因此将数据从一个线程传递到另一个线程需要大约50微秒。但它并不快！ “Disruptor的当前版本可以在线程之间以每秒100万条消息的速度执行约50 ns。”所以我的结果比预期慢了1000倍。

我的例子出了什么问题？如何实现50 ns的速度？

我已修改上面的程序，现在接收1微秒的延迟，这要好得多。但是，我仍在等待disruptor模式专家的回复。我正在寻找一个可以证明我实际上可以在50 ns内传递数据的例子。

我也使用BlockingCollection编写相同的测试，平均收到14微秒，证明Disruptor更快：

使用BlockingCollection：

average = 14 minimum = 0 0-5 = 890558, 5-10 = 1773781, 10-30 = 6900128, >30 = 435433

使用Disruptor：

average = 0 minimum = 0 0-5 = 9908469, 5-10 = 64464, 10-30 = 19902, >30 = 7065

BlockingCollection代码：

using System;
using System.Collections.Concurrent;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace DisruptorTest
{
    public sealed class ValueEntry
    {
        public int Value { get; set; }

        public ValueEntry()
        {
            //   Console.WriteLine("New ValueEntry created");
        }
    }

    //public class ValueAdditionHandler : IEventHandler<ValueEntry>
    //{
    //    public void OnNext(ValueEntry data, long sequence, bool endOfBatch)
    //    {

    //        long microseconds = Program.sw[data.Value].ElapsedTicks / (Stopwatch.Frequency / (1000L * 1000L));
    //        Program.results[data.Value] = microseconds;
    //        //Console.WriteLine("elapsed microseconds = " + microseconds);
    //        //Console.WriteLine("Event handled: Value = {0} (processed event {1}", data.Value, sequence);
    //    }
    //}

    class Program
    {
        public const int length = 10000000;
        public static Stopwatch[] sw = new Stopwatch[length];
        public static long[] results = new long[length];

        static BlockingCollection<ValueEntry> dataItems = new BlockingCollection<ValueEntry>(150);

        static void Main(string[] args)
        {
            for (int i = 0; i < length; i++)
            {
                sw[i] = Stopwatch.StartNew();
            }

            // A simple blocking consumer with no cancellation.
            Task.Factory.StartNew(() =>
            {
                while (!dataItems.IsCompleted)
                {

                    ValueEntry ve = null;
                    try
                    {
                        ve = dataItems.Take();
                        long microseconds = sw[ve.Value].ElapsedTicks / (Stopwatch.Frequency / (1000L * 1000L));
                        results[ve.Value] = microseconds;

                        //Console.WriteLine("elapsed microseconds = " + microseconds);
                        //Console.WriteLine("Event handled: Value = {0} (processed event {1}", ve.Value, ve.Value);
                    }
                    catch (InvalidOperationException) { }
                }
            }, TaskCreationOptions.LongRunning);

            for (int i = 0; i < length; i++)
            {
                var valueToSet = i;

                ValueEntry entry = new ValueEntry();
                entry.Value = valueToSet;

                sw[i].Restart();
                dataItems.Add(entry);

                //Console.WriteLine("Published entry {0}, value {1}", valueToSet, entry.Value);
                //Thread.Sleep(1000);
            }

            // Wait until all events are delivered
            Thread.Sleep(5000);

            long average = 0;
            long minimum = 10000000000;
            int firstFive = 0;
            int fiveToTen = 0;
            int tenToThirty = 0;
            int moreThenThirty = 0;

            // Do not count first 100 items because they could be extremely slow
            for (int i = 100; i < length; i++)
            {
                average += results[i];
                if (results[i] < minimum)
                {
                    minimum = results[i];
                }
                if (results[i] < 5)
                {
                    firstFive++;
                }
                else if (results[i] < 10)
                {
                    fiveToTen++;
                }
                else if (results[i] < 30)
                {
                    tenToThirty++;
                } else
                {
                    moreThenThirty++;
                }
            }
            average /= (length - 100);
            Console.WriteLine("average = {0} minimum = {1} 0-5 = {2}, 5-10 = {3}, 10-30 = {4}, >30 = {5}", average, minimum, firstFive, fiveToTen, tenToThirty, moreThenThirty);
        }
    }
}

破坏者代码：

using System;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Disruptor;
using Disruptor.Dsl;

namespace DisruptorTest
{
    public sealed class ValueEntry
    {
        public int Value { get; set; }

        public ValueEntry()
        {
            //   Console.WriteLine("New ValueEntry created");
        }
    }

    public class ValueAdditionHandler : IEventHandler<ValueEntry>
    {
        public void OnNext(ValueEntry data, long sequence, bool endOfBatch)
        {

            long microseconds = Program.sw[data.Value].ElapsedTicks / (Stopwatch.Frequency / (1000L * 1000L));
            Program.results[data.Value] = microseconds;
            //Console.WriteLine("elapsed microseconds = " + microseconds);
            //Console.WriteLine("Event handled: Value = {0} (processed event {1}", data.Value, sequence);
        }
    }

    class Program
    {
        public const int length = 10000000;
        public static Stopwatch[] sw = new Stopwatch[length];
        public static long[] results = new long[length];

        private static readonly Random _random = new Random();
        private static readonly int _ringSize = 1024;  // Must be multiple of 2

        static void Main(string[] args)
        {
            for (int i = 0; i < length; i++)
            {
                sw[i] = Stopwatch.StartNew();
            }

            var disruptor = new Disruptor.Dsl.Disruptor<ValueEntry>(() => new ValueEntry(), _ringSize, TaskScheduler.Default);

            disruptor.HandleEventsWith(new ValueAdditionHandler());

            var ringBuffer = disruptor.Start();

            for (int i = 0; i < length; i++)
            {
                var valueToSet = i;
                long sequenceNo = ringBuffer.Next();

                ValueEntry entry = ringBuffer[sequenceNo];

                entry.Value = valueToSet;

                sw[i].Restart();
                ringBuffer.Publish(sequenceNo);

                //Console.WriteLine("Published entry {0}, value {1}", sequenceNo, entry.Value);

                //Thread.Sleep(1000);
            }

            // wait until all events are delivered
            Thread.Sleep(5000);

            long average = 0;
            long minimum = 10000000000;
            int firstFive = 0;
            int fiveToTen = 0;
            int tenToThirty = 0;
            int moreThenThirty = 0;

            // Do not count first 100 items because they could be extremely slow
            for (int i = 100; i < length; i++)
            {
                average += results[i];
                if (results[i] < minimum)
                {
                    minimum = results[i];
                }
                if (results[i] < 5)
                {
                    firstFive++;
                }
                else if (results[i] < 10)
                {
                    fiveToTen++;
                }
                else if (results[i] < 30)
                {
                    tenToThirty++;
                }
                else
                {
                    moreThenThirty++;
                }
            }
            average /= (length - 100);
            Console.WriteLine("average = {0} minimum = {1} 0-5 = {2}, 5-10 = {3}, 10-30 = {4}, >30 = {5}", average, minimum, firstFive, fiveToTen, tenToThirty, moreThenThirty);
        }
    }
}

2 个答案:

答案 0 :(得分：1)

在这里，我修复了你的代码：

using System;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Disruptor;
using Disruptor.Dsl;

namespace DisruptorTest
{
    public sealed class ValueEntry
    {
        public int Value { get; set; }

        public ValueEntry()
        {
         //   Console.WriteLine("New ValueEntry created");
        }
    }

    class Program
    {
        public const int length = 1000000;
        public static Stopwatch sw;

        private static readonly Random _random = new Random();
        private static readonly int _ringSize = 1024;  // Must be multiple of 2

        static void Main(string[] args)
        {
            sw = Stopwatch.StartNew();

            var disruptor = new Disruptor.Dsl.Disruptor<ValueEntry>(() => new ValueEntry(), _ringSize, TaskScheduler.Default);

            var ringBuffer = disruptor.Start();

            for (int i = 0; i < length; i++)
            {
                var valueToSet = i;
                long sequenceNo = ringBuffer.Next();

                ValueEntry entry = ringBuffer[sequenceNo];

                entry.Value = valueToSet;

                ringBuffer.Publish(sequenceNo);

                //Console.WriteLine("Published entry {0}, value {1}", sequenceNo, entry.Value);

                //Thread.Sleep(1000);
            }

            var elapsed = sw.Elapsed.Miliseconds();
            // wait until all events are delivered
            Thread.Sleep(10000);

            double average = /(double)length;
            Console.WriteLine("average = " + average);
        }
    }
}

这应该正确测试每件物品需要多长时间。

答案 1 :(得分：0)

我阅读了BlockingCollecton代码，您在Disruptor中添加了许多Console.WriteLine，但在BlockingCollection中却没有添加，Console.WriteLine速度很慢，内部有锁。

您的RingBufferSize太小，此效果会影响性能，应为1024或更大。

和while (!dataItems.IsCompleted)可能有问题，BlockCollection始终处于添加状态，这将导致线程提早结束。

Task.Factory.StartNew(() => {
    while (!dataItems.IsCompleted)
    {

        ValueEntry ve = null;
        try
        {
    ve = dataItems.Take();
    long microseconds = sw[ve.Value].ElapsedTicks / (Stopwatch.Frequency / (1000L * 1000L));
    results[ve.Value] = microseconds;

    //Console.WriteLine("elapsed microseconds = " + microseconds);
    //Console.WriteLine("Event handled: Value = {0} (processed event {1}", ve.Value, ve.Value);
        }
        catch (InvalidOperationException) { }
    }
}, TaskCreationOptions.LongRunning);


for (int i = 0; i < length; i++)
{
    var valueToSet = i;

    ValueEntry entry = new ValueEntry();
    entry.Value = valueToSet;

    sw[i].Restart();
    dataItems.Add(entry);

    //Console.WriteLine("Published entry {0}, value {1}", valueToSet, entry.Value);
    //Thread.Sleep(1000);
}

我已经为您重写了代码，Disruptor比具有多生产者（10个并行生产者）的BlockingCollection快10倍，比具有单一生产者的BlockingCollection快2倍：

using System;
using System.Collections.Concurrent;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;
using Disruptor;
using Disruptor.Dsl;
using NUnit.Framework;

namespace DisruptorTest.Ds
{
    public sealed class ValueEntry
    {
        internal int Id { get; set; }
    }

    class MyHandler : IEventHandler<ValueEntry>
    {
        public void OnEvent(ValueEntry data, long sequence, bool endOfBatch)
        {
        }
    }

    [TestFixture]
    public class DisruptorPerformanceTest
    {
        private volatile bool collectionAddEnded;

        private int producerCount = 10;
        private int runCount = 1000000;
        private int RingBufferAndCapacitySize = 1024;

        [TestCase()]
        public async Task TestBoth()
        {
            for (int i = 0; i < 1; i++)
            {
                foreach (var rs in new int[] {64, 512, 1024, 2048 /*,4096,4096*2*/})
                {
                    Console.WriteLine($"RingBufferAndCapacitySize:{rs}, producerCount:{producerCount}, runCount:{runCount} of {i}");
                    RingBufferAndCapacitySize = rs;
                    await DisruptorTest();
                    await BlockingCollectionTest();
                }
            }
        }

        [TestCase()]
        public async Task BlockingCollectionTest()
        {
            var sw = new Stopwatch();
            BlockingCollection<ValueEntry> dataItems = new BlockingCollection<ValueEntry>(RingBufferAndCapacitySize);

            sw.Start();

            collectionAddEnded = false;

            // A simple blocking consumer with no cancellation.
            var task = Task.Factory.StartNew(() =>
            {
                while (!collectionAddEnded && !dataItems.IsCompleted)
                {
                    //if (!dataItems.IsCompleted && dataItems.TryTake(out var ve))
                    if (dataItems.TryTake(out var ve))
                    {
                    }
                }
            }, TaskCreationOptions.LongRunning);


            var tasks = new Task[producerCount];
            for (int t = 0; t < producerCount; t++)
            {
                tasks[t] = Task.Run(() =>
                {
                    for (int i = 0; i < runCount; i++)
                    {
                        ValueEntry entry = new ValueEntry();
                        entry.Id = i;
                        dataItems.Add(entry);
                    }
                });
            }

            await Task.WhenAll(tasks);

            collectionAddEnded = true;
            await task;

            sw.Stop();

            Console.WriteLine($"BlockingCollectionTest Time:{sw.ElapsedMilliseconds/1000d}");
        }


        [TestCase()]
        public async Task DisruptorTest()
        {
            var disruptor =
                new Disruptor.Dsl.Disruptor<ValueEntry>(() => new ValueEntry(), RingBufferAndCapacitySize, TaskScheduler.Default,
                    producerCount > 1 ? ProducerType.Multi : ProducerType.Single, new BlockingWaitStrategy());
            disruptor.HandleEventsWith(new MyHandler());

            var _ringBuffer = disruptor.Start();

            Stopwatch sw = Stopwatch.StartNew();

            sw.Start();


            var tasks = new Task[producerCount];
            for (int t = 0; t < producerCount; t++)
            {
                tasks[t] = Task.Run(() =>
                {
                    for (int i = 0; i < runCount; i++)
                    {
                        long sequenceNo = _ringBuffer.Next();
                        _ringBuffer[sequenceNo].Id = 0;
                        _ringBuffer.Publish(sequenceNo);
                    }
                });
            }


            await Task.WhenAll(tasks);


            disruptor.Shutdown();

            sw.Stop();
            Console.WriteLine($"DisruptorTest Time:{sw.ElapsedMilliseconds/1000d}s");
        }
    }
}

具有共享ValueEntry实例的BlockingCollectionTest（for循环中没有新的ValueEntry（））

  • RingBufferAndCapacitySize：64，producerCount：10，runCount：1000000 of 0

    DisruptorTest时间：16.962s

    BlockingCollectionTest时间：18.399

  • RingBufferAndCapacitySize：512，producerCount：10，runCount：1000000为0 DisruptorTest时间：6.101s

    BlockingCollectionTest时间：19.526

  • RingBufferAndCapacitySize：1024，producerCount：10，runCount：1000000 of 0

    DisruptorTest时间：2.928秒

    BlockingCollectionTest时间：20.25

  • RingBufferAndCapacitySize：2048，producerCount：10，runCount：1000000 of 0

    DisruptorTest时间：2.448秒

    BlockingCollectionTest时间：20.649

BlockingCollectionTest在for循环中创建一个新的ValueEntry（）

  • RingBufferAndCapacitySize：64，producerCount：10，runCount：1000000 of 0

    DisruptorTest时间：27.374s

    BlockingCollectionTest时间：21.955

  • RingBufferAndCapacitySize：512，producerCount：10，runCount：1000000 of 0

    DisruptorTest时间：5.011秒

    BlockingCollectionTest时间：20.127

  • RingBufferAndCapacitySize：1024，producerCount：10，runCount：1000000 of 0

    DisruptorTest时间：2.877秒

    BlockingCollectionTest时间：22.656

  • RingBufferAndCapacitySize：2048，producerCount：10，runCount：1000000 of 0

    DisruptorTest时间：2.384秒

    BlockingCollectionTest时间：23.567

https://www.cnblogs.com/darklx/p/11755686.html

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