Misaki
d8a7b07624
- Refactor D3D12 backend and RenderGraph module - Update graphics RHI and core rendering components - Add Random.hlsl shader include - Regenerate API documentation and update user guides
200 lines
7.8 KiB
HTML
200 lines
7.8 KiB
HTML
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GhostEngine
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<h1 id="performance-patterns">Performance Patterns</h1>
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<p>This page captures the runtime performance techniques used in <code>Ghost.Entities</code> and how to apply them.</p>
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<h2 id="data-layout">Data Layout</h2>
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<ul>
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<li>Archetype storage uses contiguous component arrays per chunk.</li>
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<li>Chunk memory is fixed-size (<code>Chunk.CHUNK_BUFFER_SIZE</code>) to bound allocations and improve locality.</li>
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<li>Component layouts are precomputed per archetype:
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<ul>
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<li>offset,</li>
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<li>size,</li>
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<li>enable-bit offset,</li>
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<li>version index.</li>
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</ul>
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</li>
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</ul>
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<p>Why it matters:</p>
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<ul>
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<li>Sequential memory access in inner loops.</li>
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<li>Fewer pointer indirections than object-per-entity layouts.</li>
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</ul>
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<h2 id="structural-cost-model">Structural Cost Model</h2>
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<p>Structural changes are intentionally explicit and potentially expensive.</p>
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<ul>
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<li><code>AddComponent</code> / <code>RemoveComponent</code> move entities between archetypes.</li>
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<li>Removal uses swap-back compaction to keep chunks dense.</li>
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<li>Batch destroy path sorts locations and processes by chunk to reduce random work.</li>
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</ul>
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<p>Guidance:</p>
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<ul>
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<li>Prefer bulk creation APIs (<code>CreateEntities</code>) over repeated single inserts.</li>
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<li>Minimize structural churn in hot update loops.</li>
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<li>Use <code>EntityCommandBuffer</code> to defer structural edits.</li>
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</ul>
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<h2 id="query-efficiency">Query Efficiency</h2>
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<ul>
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<li>Queries are compiled into bitset masks.</li>
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<li>Query instances are cached by mask hash in <code>ComponentManager</code>.</li>
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<li>New archetypes are incrementally tested and added to existing query match lists.</li>
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</ul>
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<p>Guidance:</p>
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<ul>
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<li>Build query once, reuse query ID.</li>
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<li>Avoid rebuilding identical queries every frame.</li>
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</ul>
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<h2 id="enableable-components">Enableable Components</h2>
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<p>Enableable state is stored in bitmasks per chunk.</p>
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<ul>
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<li>Toggle with <code>EntityManager.SetEnabled<T>(...)</code>.</li>
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<li>Query semantics (<code>WithAll</code>, <code>WithNone</code>, <code>WithDisabled</code>, <code>WithPresent</code>) combine structural and enablement checks.</li>
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</ul>
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<p>Guidance:</p>
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<ul>
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<li>Prefer enable/disable for state toggles over add/remove where possible.</li>
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</ul>
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<h2 id="change-versioning">Change Versioning</h2>
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<p>The runtime tracks:</p>
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<ul>
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<li>world version (<code>World.Version</code>),</li>
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<li>chunk structural version,</li>
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<li>per-component version per chunk.</li>
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</ul>
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<p><code>ChunkView</code> APIs such as <code>HasChanged<T>(version)</code> allow change-filtered work.</p>
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<p>Guidance:</p>
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<ul>
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<li>Cache last processed version per system/subsystem.</li>
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<li>Skip unchanged chunks/components when possible.</li>
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</ul>
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<h2 id="jobs-and-parallel-chunk-processing">Jobs and Parallel Chunk Processing</h2>
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<p><code>EntityQuery.ScheduleChunkParallel</code> transforms matched chunks into job batches and schedules <code>IJobParallelFor</code> work.</p>
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<p>Guidance:</p>
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<ul>
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<li>Use chunk jobs for broad data transforms.</li>
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<li>Keep <code>batchSize</code> tuned for your workload.</li>
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<li>Chain dependencies correctly and wait only at necessary sync points.</li>
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</ul>
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<h2 id="allocation-and-lifetime-hygiene">Allocation and Lifetime Hygiene</h2>
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<ul>
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<li>Temporary data often uses stack/temporary allocators (<code>AllocationManager.CreateStackScope</code>).</li>
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<li>Persistent containers are explicitly disposed.</li>
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</ul>
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<p>Guidance:</p>
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<ul>
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<li>Keep temporary allocations scoped and short-lived.</li>
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<li>Always dispose worlds, schedulers, and persistent collections deterministically.</li>
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</ul>
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</article>
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