Memory Consumption vs Competitor

[majora2007]

I am under consideration of switching to ImageSharp, as I currently use NetVips. However NetVips has an SSE 4.2 requirement that is impacting some of my users.

I wrote some benchmarks to emulate a common operation from my software; resizing an image from a memory stream (an open archive) and writing to disk. However, I'm finding that ImageSharp uses a considerable amount of memory more. Is there a better way for me to write the code?

All benchmarks read from the same file and I'm using the following annotations:

[StopOnFirstError]
[MemoryDiagnoser]
[RankColumn]
[Orderer(SummaryOrderPolicy.FastestToSlowest)]
[SimpleJob(launchCount: 1, warmupCount: 5, targetCount: 20)]

 [Benchmark]
    public void ImageSharp_ExtractImage_PNG()
    {
        var outputDirectory = "C:/Users/josep/Pictures/imagesharp/";
        _directoryService.ExistOrCreate(outputDirectory);

        using var stream = new FileStream(SourceImage, FileMode.Open);
        using var thumbnail2 = SixLabors.ImageSharp.Image.Load(stream);
        thumbnail2.Mutate(x => x.Resize(320, 0));
        thumbnail2.Save(_directoryService.FileSystem.Path.Join(outputDirectory, "imagesharp.png"), _pngEncoder);
    }

    [Benchmark]
    public void ImageSharp_ExtractImage_WebP()
    {
        var outputDirectory = "C:/Users/josep/Pictures/imagesharp/";
        _directoryService.ExistOrCreate(outputDirectory);

        using var stream = new FileStream(SourceImage, FileMode.Open);
        using var thumbnail2 = SixLabors.ImageSharp.Image.Load(stream);
        thumbnail2.Mutate(x => x.Resize(320, 0));
        thumbnail2.Save(_directoryService.FileSystem.Path.Join(outputDirectory, "imagesharp.webp"), _webPEncoder);
    }

    [Benchmark]
    public void NetVips_ExtractImage_PNG()
    {
        var outputDirectory = "C:/Users/josep/Pictures/netvips/";
        _directoryService.ExistOrCreate(outputDirectory);

        using var stream = new FileStream(SourceImage, FileMode.Open);
        using var thumbnail = NetVips.Image.ThumbnailStream(stream, 320);
        thumbnail.WriteToFile(_directoryService.FileSystem.Path.Join(outputDirectory, "netvips.png"));
    }

    [Benchmark]
    public void NetVips_ExtractImage_WebP()
    {
        var outputDirectory = "C:/Users/josep/Pictures/netvips/";
        _directoryService.ExistOrCreate(outputDirectory);

        using var stream = new FileStream(SourceImage, FileMode.Open);
        using var thumbnail = NetVips.Image.ThumbnailStream(stream, 320);
        thumbnail.WriteToFile(_directoryService.FileSystem.Path.Join(outputDirectory, "netvips.webp"));
    }

[JimBobSquarePants]

You’re not measuring the same thing. You need to measure unmanaged memory also.

[majora2007]

I didn't see much online about measuring unmanaged memory as well. Does this have to be done via a profiler exclusively?

[JimBobSquarePants]

You need the NativeMemoryProfiler https://wojciechnagorski.com/2019/08/analyzing-native-memory-allocation-with-benchmarkdotnet/

Our WebP codec definitely needs a once over though to reduce allocations. We should be able to do better than that.