//-----------------------------------------------------------------------
// -----------------------------------------------------------------------
// file="SlabStressTest"
// Project: StgSharp
// AuthorGroup: Nitload Space
// Copyright (c) Nitload Space. All rights reserved.
//     
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//     
// -----------------------------------------------------------------------
// -----------------------------------------------------------------------
using StgSharp.Mathematics.Memory;
using System;
using System.Diagnostics;

namespace StgSharp
{
    internal static class SlabStressTest
    {

        // Exercise the Nonconcurrent Chunked SLAB used by HLSF (allocation/free only)
        public static unsafe void Run()
        {
            Console.WriteLine("=== SLAB Allocator (Chunked) Single-Thread Stress Test ===");

            // Use SLAB with element size of pointer (nuint) to simulate Entry handles
            SlabAllocator<BunchOfBytes> slab = SlabAllocator<BunchOfBytes>.Create(64, SlabBufferLayout.Chunked, false);

            int cycles = 10;
            int allocsPerCycle = 200_000; // large enough to force internal growth

            Stopwatch sw = new Stopwatch();

            for (int c = 0; c < cycles; c++)
            {
                Console.WriteLine($"--- Cycle {c+1} ---");
                nuint[] ptrs = new nuint[allocsPerCycle];

                sw.Restart();
                for (int i = 0; i < allocsPerCycle; i++) {
                    ptrs[i] = slab.Allocate();
                }
                sw.Stop();
                Console.WriteLine($"Allocate: {allocsPerCycle} in {sw.Elapsed.TotalSeconds:0.00}s");

                sw.Restart();
                for (int i = 0; i < allocsPerCycle; i++) {
                    slab.Free(ptrs[i]);
                }
                sw.Stop();
                Console.WriteLine($"Free: {allocsPerCycle} in {sw.Elapsed.TotalSeconds:0.00}s");
            }

            slab.Dispose();
            Console.WriteLine("=== SLAB Stress Complete ===");
        }

        internal unsafe struct BunchOfBytes
        {

            public fixed byte Data[128];

        }

    }
}