Function TestDefragmentationGpu

src/Tests.cpp:2539–2634

}

static void TestDefragmentationGpu()
{
    wprintf(L"Test defragmentation GPU\n");

    // Create that many allocations to surely fill 3 new blocks of 256 MB.
    const VkDeviceSize bufSizeMin = 5ull * 1024 * 1024;
    const VkDeviceSize bufSizeMax = 10ull * 1024 * 1024;
    const VkDeviceSize totalSize = 3ull * 256 * 1024 * 1024;
    const size_t bufCount = (size_t)(totalSize / bufSizeMin);
    const size_t percentToLeave = 30;
    const size_t percentNonMovable = 3;
    RandomNumberGenerator rand = { 234522 };

    std::vector<AllocInfo> allocations;
    allocations.reserve(bufCount);

    VkBufferCreateInfo bufCreateInfo = { VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO };

    VmaAllocationCreateInfo allocCreateInfo = {};
    allocCreateInfo.usage = VMA_MEMORY_USAGE_AUTO_PREFER_DEVICE;

    // Create all intended buffers.
    for(size_t i = 0; i < bufCount; ++i)
    {
        bufCreateInfo.size = align_up(rand.Generate() % (bufSizeMax - bufSizeMin) + bufSizeMin, 32ull);

        AllocInfo alloc;

        if(rand.Generate() % 100 < percentNonMovable)
        {
            bufCreateInfo.usage = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT |
                VK_BUFFER_USAGE_TRANSFER_DST_BIT |
                VK_BUFFER_USAGE_TRANSFER_SRC_BIT;
            alloc.m_DefragmentationMovable = false;
        }
        else
        {
            // Different usage just to see different color in output from VmaDumpVis.
            bufCreateInfo.usage = VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT |
                VK_BUFFER_USAGE_TRANSFER_DST_BIT |
                VK_BUFFER_USAGE_TRANSFER_SRC_BIT;
            // And in JSON dump.
        }

        alloc.CreateBuffer(bufCreateInfo, allocCreateInfo);
        alloc.m_StartValue = rand.Generate();
        allocations.push_back(alloc);
    }

    // Destroy some percentage of them.
    {
        const size_t buffersToDestroy = round_div<size_t>(bufCount * (100 - percentToLeave), 100);
        for(size_t i = 0; i < buffersToDestroy; ++i)
        {
            const size_t index = rand.Generate() % allocations.size();
            allocations[index].Destroy();
            allocations.erase(allocations.begin() + index);
        }