JsonValue Benchmarks

JsonValueBenchmarks.cs

using BenchmarkDotNet.Attributes;
using System.Text.Json;
using System.Text.Json.Nodes;

namespace Benchmarks;

[HideColumns("Job", "Error", "StdDev", "RatioSD")]
[MemoryDiagnoser(displayGenColumns: false)]
public class JsonValueBenchmarks
{
    private readonly JsonNode _largeObject;
    private readonly JsonNode _largeObjectJsonElement;
    private readonly JsonNode[] _smallValues;
    private readonly JsonNode[] _smallValuesJsonElement;

    public JsonValueBenchmarks()
    {
        _largeObject = new JsonObject()
        {
            ["key1"] = 42,
            ["key2"] = "string",
            ["key3"] = new JsonArray() { true, 3.14159, "hello", DateTimeOffset.Now },
            ["key4"] = new JsonObject()
            {
                ["key5"] = 42,
                ["key6"] = "string",
                ["key7"] = new JsonArray() { true, 3.14159, "hello", Guid.Empty },
            }
        };

        _smallValues = [42, "I am a string", false, DateTimeOffset.Now];
        _largeObjectJsonElement = JsonSerializer.Deserialize<JsonNode>(JsonSerializer.Serialize(_largeObject))!;
        _smallValuesJsonElement = JsonSerializer.Deserialize<JsonNode[]>(JsonSerializer.Serialize(_smallValues))!;
    }

    [Benchmark]
    public bool DeepEquals() => JsonNode.DeepEquals(_largeObject, _largeObject);

    [Benchmark]
    public bool DeepEquals_JsonElement() => JsonNode.DeepEquals(_largeObjectJsonElement, _largeObjectJsonElement);

    [Benchmark]
    public JsonValueKind GetValueKind()
    {
        JsonValueKind result = default;
        foreach (JsonNode value in _smallValues.AsSpan())
        {
            result = value.GetValueKind();
        }
        return result;
    }

    [Benchmark]
    public JsonValueKind GetValueKind_JsonElement()
    {
        JsonValueKind result = default;
        foreach (JsonNode value in _smallValuesJsonElement.AsSpan())
        {
            result = value.GetValueKind();
        }
        return result;
    }
}

Results.md

Method	Branch	Mean	Ratio	Allocated	Alloc Ratio
DeepEquals	main	2,859.165 ns	1.00	4224 B	1.00
DeepEquals	PR	270.130 ns	0.09	-	0.00
DeepEquals_JsonElement	main	660.551 ns	1.00	328 B	1.00
DeepEquals_JsonElement	PR	432.391 ns	0.65	-	0.00
GetValueKind	main	612.784 ns	1.000	616 B	1.00
GetValueKind	PR	5.243 ns	0.009	-	0.00
GetValueKind_JsonElement	main	15.557 ns	1.00	-	NA
GetValueKind_JsonElement	PR	11.111 ns	0.71	-	NA