public string Execute(string[] args)
{
NetVips.CacheSetMax(0);
Image b;
using (var a = Image.NewFromMemory(Enumerable.Repeat((byte)255, 200).ToArray(), 20, 10, 1, "uchar"))
{
b = a / 2;
} // g_object_unref
Console.WriteLine($"Reference count b: {b.RefCount}");
var average = b.Avg();
Console.WriteLine($"Before GC: {average}");
GC.Collect();
GC.WaitForPendingFinalizers();
average = b.Avg();
Console.WriteLine($"After GC: {average}");
return("All done!");
}
/// <summary>
/// Load from memory buffer 10000 times.
///
/// It runs in a fairly steady 60MB of ram for me. Watching the output, you see
/// stuff like:
///
/// memory processing <NetVips.Image 4120x2747 uchar, 3 bands, srgb>
/// 24 vips objects known to net-vips
/// memory processing <NetVips.Image 4120x2747 uchar, 3 bands, srgb>
/// 21 vips objects known to net-vips
/// memory processing <NetVips.Image 4120x2747 uchar, 3 bands, srgb>
/// 23 vips objects known to net-vips
/// memory processing <NetVips.Image 4120x2747 uchar, 3 bands, srgb>
/// 16 vips objects known to net-vips
/// memory processing <NetVips.Image 4120x2747 uchar, 3 bands, srgb>
/// 7 vips objects known to net-vips
/// memory processing <NetVips.Image 4120x2747 uchar, 3 bands, srgb>
/// 7 vips objects known to net-vips
/// memory processing <NetVips.Image 4120x2747 uchar, 3 bands, srgb>
/// 9 vips objects known to net-vips
/// memory processing <NetVips.Image 4120x2747 uchar, 3 bands, srgb>
/// 4 vips objects known to net-vips
/// memory processing <NetVips.Image 4120x2747 uchar, 3 bands, srgb>
///
/// So when around 25 vips objects are alive, the C# gc runs and they all get
/// flushed.
///
/// If you want it to run in less ram than that, you'll need to expose the GC and
/// trigger it manually every so often.
/// </summary>
/// <param name="args">Command-line arguments.</param>
/// <returns>Result.</returns>
public string Execute(string[] args)
{
NetVips.LeakSet(true);
NetVips.CacheSetMax(0);
var imageBytes = File.ReadAllBytes(Filename);
for (var i = 0; i < 10000; i++)
{
using var img = Image.NewFromBuffer(imageBytes);
Console.WriteLine($"memory processing {img}");
// uncomment this line together with the `NObjects` variable in GObject
// Console.WriteLine($"{GObject.NObjects} vips objects known to net-vips");
}
return("All done!");
}
public string Execute(string[] args)
{
NetVips.CacheSetMax(0);
using var fileStream = File.OpenRead(Filename);
using var image = Image.NewFromStream(fileStream);
for (var i = 0; i < 1000; i++)
{
using var crop = image.Crop(0, 0, 256, 256);
var _ = crop.Avg();
Console.WriteLine($"reference count: {image.RefCount}");
// RefCount should not increase (i.e. operation should be freed)
Debug.Assert(image.RefCount == 2u);
}
var count = 0;
var locker = new object();
Parallel.For(0, 1000, new ParallelOptions {
MaxDegreeOfParallelism = NetVips.ConcurrencyGet()
},
i =>
{
Interlocked.Increment(ref count);
using var crop = image.Crop(0, 0, 256, 256);
lock (locker)
{
var _ = crop.Avg();
Console.WriteLine($"reference count: {image.RefCount} with {count} active threads");
// RefCount -1 must be lower than or equal to the number of active threads
Debug.Assert(image.RefCount - 1 <= (uint)count);
}
Interlocked.Decrement(ref count);
});
return("All done!");
}