study/first_study/Library/PackageCache/com.unity.collections@aea9d3bd5e19/Unity.Collections.PerformanceTests/UnsafeStreamPerformanceTests.cs

using NUnit.Framework;
using System;
using Unity.Burst;
using Unity.Collections;
using Unity.Collections.LowLevel.Unsafe;
using Unity.Jobs;
using Unity.PerformanceTesting;

namespace Unity.Collections.PerformanceTests
{
    internal class UnsafeStreamPerformanceTests
    {
        [BurstCompile]
        private class Pointers
        {
            [BurstCompile(CompileSynchronously = true)]
            public static void StreamWrite(ref UnsafeStream stream, int numElements)
            {
                var writer = stream.AsWriter();

                for (int i = 0; i < numElements; ++i)
                {
                    writer.Write(i);
                }
            }

            public delegate void StreamWriteDelegate(ref UnsafeStream stream, int numElements);
        }

        [Test, Performance]
        [Category("Performance")]
        public void UnsafeStream_Performance_Write()
        {
            const int numElements = 16 << 10;

            var stream = new UnsafeStream(1, Allocator.Persistent);

            var writer = stream.AsWriter();

            Measure.Method(() =>
                {
                    for (int i = 0; i < numElements; ++i)
                    {
                        writer.Write(i);
                    }
                })
                .WarmupCount(100)
                .MeasurementCount(1000)
                .Run();

            stream.Dispose();
        }

        [Test, Performance]
        [Category("Performance")]
        public void UnsafeStream_Performance_Write_Burst()
        {
            const int numElements = 16 << 10;

            var stream = new UnsafeStream(1, Allocator.Persistent);

            var funcPtr = BurstCompiler.CompileFunctionPointer<Pointers.StreamWriteDelegate>(Pointers.StreamWrite);

            Measure.Method(() => { funcPtr.Invoke(ref stream, numElements); })
                .WarmupCount(100)
                .MeasurementCount(1000)
                .Run();

            stream.Dispose();
        }
    }
}