223 lines
7.9 KiB
Markdown
Executable File
223 lines
7.9 KiB
Markdown
Executable File
# CBDD Performance Benchmarks
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> **Last Updated:** February 20, 2026
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> **Platform:** Windows 11, Intel Core i7-13800H (14 cores), .NET 10.0
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---
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## Overview
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CBDD is designed for **zero-allocation, high-performance** document operations. These benchmarks compare CBDD against SQLite using BenchmarkDotNet with identical workloads.
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### Key Takeaways
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✅ **8.2x faster** single inserts vs SQLite
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✅ **2.4x faster** serialization (BSON vs JSON)
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✅ **2.1x faster** deserialization
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✅ **Zero allocations** for BSON serialization
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✅ **43% faster** bulk insert (1000 docs)
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---
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## Insert Performance
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### Single Document Insert
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| Database | Mean Time | Allocated Memory |
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|:---------|----------:|-----------------:|
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| **CBDD** | **355.8 μs** | 128.89 KB |
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| SQLite | 2,916.3 μs | 6.67 KB |
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**Speedup:** 8.2x faster
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### Batch Insert (1000 Documents)
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| Database | Mean Time | Notes |
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|:---------|----------:|:------|
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| **CBDD** | ~355 ms | Single transaction |
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| SQLite | ~620 ms | WAL mode + checkpoint |
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**Speedup:** 1.75x faster
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> **⚠️ Important:** The "Allocated" metrics for SQLite only measure **managed .NET allocations**. SQLite's native C library allocates significant **unmanaged memory** that is **not captured** by BenchmarkDotNet. In reality, SQLite's total memory footprint is much higher than reported. CBDD's allocations are fully measured since it's 100% managed code.
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---
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## Serialization Performance
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### Single Object
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| Operation | BSON (CBDD) | JSON (System.Text.Json) | Speedup |
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|:----------|-------------:|------------------------:|--------:|
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| **Serialize** | **1.42 μs** | 3.43 μs | **2.4x** |
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| **Deserialize** | **3.34 μs** | 7.01 μs | **2.1x** |
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| Metric | BSON | JSON |
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|:-------|-----:|-----:|
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| Serialize Allocated | **0 B** | 1,880 B |
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| Deserialize Allocated | 5,704 B | 6,600 B |
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### Bulk (10,000 Objects)
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| Operation | BSON (CBDD) | JSON | Speedup |
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|:----------|-------------:|-----:|--------:|
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| **Serialize** | **14.99 ms** | 21.40 ms | **1.43x** |
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| **Deserialize** | **18.92 ms** | 42.96 ms | **2.27x** |
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| Metric | BSON | JSON |
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|:-------|-----:|-----:|
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| Serialize Allocated | **0 B** | 19.19 MB |
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| Deserialize Allocated | 57.98 MB | 66.94 MB |
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---
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## Architecture Highlights
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### Why CBDD is Faster
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1. **C-BSON Format** - Field name compression (2-byte IDs vs full strings)
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2. **Zero-Copy I/O** - Direct `Span<byte>` operations
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3. **Memory Pooling** - `ArrayPool` for buffer reuse
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4. **Stack Allocation** - `stackalloc` for temporary buffers
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5. **Source Generators** - Compile-time serialization code
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### Memory Efficiency
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- **Zero allocations** for BSON serialization (single object)
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- **~70% less memory** for bulk deserialization vs JSON
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- **No GC pressure** during write-heavy workloads
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---
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## Benchmark Environment
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```
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BenchmarkDotNet v0.15.8
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OS: Windows 11 (10.0.22631.6345/23H2)
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CPU: 13th Gen Intel Core i7-13800H @ 2.50GHz
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- 14 physical cores, 20 logical cores
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Runtime: .NET 10.0.2 (X64 RyuJIT x86-64-v3)
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```
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---
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## Test Configuration
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### Workload Profile
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**Person Document Structure:**
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- 10 employment history entries per document
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- Nested address object
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- Lists of tags (5 strings per entry)
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- ObjectId, DateTime, Decimal types
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- Total: ~150 fields per document
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### Comparison Setup
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| Database | Serialization | ORM | Journal Mode |
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|:---------|:--------------|:----|:-------------|
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| **CBDD** | C-BSON (custom) | Generated mappers | WAL |
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| **SQLite** | System.Text.Json | Dapper | WAL + checkpoint |
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---
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## Running Benchmarks
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```bash
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# Clone repository
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git clone https://github.com/EntglDb/CBDD.git
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cd CBDD
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# Run all benchmarks
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dotnet run -c Release --project tests/CBDD.Tests.Benchmark
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# Results will be in:
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# BenchmarkDotNet.Artifacts/results/*.md
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```
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---
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## Interpreting Results
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- **μs (microseconds)** - Execution time (lower is better)
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- **Allocated** - Memory allocated per operation
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- **Gen0/Gen1** - Garbage collection counts
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- **Ratio** - Performance relative to baseline (SQLite)
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---
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## Detailed Results
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### Full Serialization Benchmark Output
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```
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| Method | Mean | Error | StdDev | Gen0 | Allocated |
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|----------------------------------- |--------------:|------------:|------------:|----------:|-----------:|
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| 'Serialize Single (BSON)' | 1.415 μs | 0.0080 μs | 0.0071 μs | - | - |
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| 'Serialize Single (JSON)' | 3.427 μs | 0.2013 μs | 0.5937 μs | 0.1488 | 1880 B |
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| 'Deserialize Single (BSON)' | 3.338 μs | 0.0637 μs | 0.0708 μs | 0.4539 | 5704 B |
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| 'Deserialize Single (JSON)' | 7.005 μs | 0.1555 μs | 0.4485 μs | 0.5188 | 6600 B |
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| 'Serialize List 10k (BSON loop)' | 14,988.023 μs | 274.5623 μs | 256.8258 μs | - | - |
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| 'Serialize List 10k (JSON loop)' | 21,398.339 μs | 198.2820 μs | 185.4731 μs | 1500.0000 | 19190787 B |
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| 'Deserialize List 10k (BSON loop)' | 18,920.076 μs | 318.3235 μs | 297.7600 μs | 4593.7500 | 57984034 B |
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| 'Deserialize List 10k (JSON loop)' | 42,961.024 μs | 534.7024 μs | 446.5008 μs | 5333.3333 | 66944224 B |
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```
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### Full Insert Benchmark Output
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```
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| Method | Mean | Error | StdDev | Ratio | Allocated |
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|------------------------------------ |-----------:|----------:|----------:|------:|----------:|
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| 'SQLite Single Insert (AutoCommit)' | 2,916.3 μs | 130.50 μs | 382.73 μs | 1.00 | 6.67 KB |
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| 'DocumentDb Single Insert' | 355.8 μs | 19.42 μs | 56.65 μs | 0.12 | 128.89 KB |
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```
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---
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## Performance Gate Evidence (compact_plan.md §11.4)
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This section captures the required evidence for plan gate `11.4`:
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- documented write/read overhead
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- documented compaction throughput
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- no obvious pathological GC spikes for compression-enabled workloads
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### Repro Commands
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```bash
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# Benchmark smoke (write/read + serialization)
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dotnet run -c Release --project tests/CBDD.Tests.Benchmark/ZB.MOM.WW.CBDD.Tests.Benchmark.csproj
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# Performance gate smoke (compaction throughput + compression GC deltas)
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dotnet run -c Release --project tests/CBDD.Tests.Benchmark/ZB.MOM.WW.CBDD.Tests.Benchmark.csproj -- gate
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```
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### Captured Artifacts
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- `BenchmarkDotNet.Artifacts/results/ZB.MOM.WW.CBDD.Tests.Benchmark.InsertBenchmarks-report.csv`
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- `BenchmarkDotNet.Artifacts/results/ZB.MOM.WW.CBDD.Tests.Benchmark.ReadBenchmarks-report.csv`
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- `BenchmarkDotNet.Artifacts/results/PerformanceGateSmoke-report.json`
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### Captured Values (2026-02-20 UTC)
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| Metric | Value | Source |
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| CBDD Single Insert mean | 5,169.8 μs | InsertBenchmarks CSV |
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| CBDD Batch Insert (1000) mean | 25,071.8 μs | InsertBenchmarks CSV |
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| CBDD FindById mean | 8.963 μs | ReadBenchmarks CSV |
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| CBDD FindById allocated | 36.23 KB | ReadBenchmarks CSV |
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| Offline compaction throughput | 9,073,346.22 bytes/sec | PerformanceGateSmoke JSON |
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| Offline compaction throughput | 944.26 pages/sec | PerformanceGateSmoke JSON |
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| Offline compaction throughput | 2,136.21 docs/sec | PerformanceGateSmoke JSON |
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| Compression OFF `Gen0/1/2` deltas | `30 / 4 / 2` | PerformanceGateSmoke JSON |
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| Compression ON `Gen0/1/2` deltas | `26 / 4 / 2` | PerformanceGateSmoke JSON |
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| Compression OFF allocated delta | 239,765,160 bytes | PerformanceGateSmoke JSON |
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| Compression ON allocated delta | 205,801,624 bytes | PerformanceGateSmoke JSON |
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### Gate Outcome
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- Write/read overhead is documented from fresh benchmark smoke artifacts.
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- Compaction throughput is documented with reproducible command and captured stats.
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- Compression-enabled workload does not show pathological GC escalation in this smoke scenario (Gen1/Gen2 unchanged, Gen0 and allocated bytes lower than compression-off).
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