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  • Recherchez et résolvez les problèmes de performances dans vos jeux Metal

    Traquez les problèmes de performances de jeu difficiles à identifier grâce à de puissants outils Metal. Découvrez comment collecter des données de performances riches à l'aide de Game Performance Overview dans Instruments, exécuter des traces en arrière-plan avec metalperftrace sur macOS et le centre de contrôle sur iOS, et utiliser la nouvelle API StateReporting pour corréler directement les métriques à l'état d'exécution de votre jeu. Transformez des heures de télémétrie en informations claires et exploitables.

    Chapitres

    • 0:00 - Introduction
    • 1:51 - Métriques de performance Metal
    • 3:32 - Collecte de traces
    • 6:38 - Analyser les traces de performances
    • 10:08 - Contextualiser avec StateReporting
    • 17:48 - Collecter des données de terrain avec MetricKit
    • 19:41 - Étapes suivantes

    Ressources

    • Understanding the Metal Performance HUD metrics
    • Monitoring your Metal app’s graphics performance
    • Getting started with StateReporting
    • Metal debugger
      • Vidéo HD
      • Vidéo SD

    Vidéos connexes

    Tech Talks

    • Discover new Metal profiling tools for M3 and A17 Pro
  • Rechercher dans cette vidéo…
    • 5:00 - Collect a trace with metalperftrace

      # Collect the last 5 hours
      metalperftrace collect /tmp --last 5h
      
      # Output
      # Metal performance traces collected to: /tmp
      # /tmp/MetalPerfTrace_20260401_094100_to_144100.atrc
      
      # Or collect an explicit time range
      metalperftrace collect /tmp \
        --start 2026-04-01T09:41:00 \
        --end 2026-04-01T12:41:00
    • 7:02 - Print a trace overview

      metalperftrace overview /Data/MyGameTrace.atrc
      
      # [Modern Renderer pid:13833]
      # Mem: 2146.1 MiB (2343.9 Peak, 1199.4 Metal)
      # Total CPU Time: 2417.601s (33.17% Sys, 66.83% User)
      # Instructions: 9944836683668 (5.75% P, 94.25% E)
      # Cycles: 5176430469224 (4.45% P, 95.55% E)
      # Disk Reads / Writes: 317.37 / 0.04 MiB (Logical Write 0.04)
      # Layer 0x729293000 (3456x2104) Interval 300.065s Active 300.065s
      #   59.7 FPS  17735 Frames  188 Skipped
      #   Frame Time avg: 16.74ms min: 8.33 max: 125.00 stddev: 3.70
      #   CPU Begin-to-Present avg: 3.99ms min: 1.40 max: 94.37 stddev: 1.80
      #   On-GPU Time avg: 13.39ms min: 5.24 max: 37.57 stddev: 1.43
      #   Next Drawable Wait avg: 0.26ms min: 0.00 max: 91.08 stddev: 1.75
      #   Shader Compilation Time: 0.000s (Total: 0, Cached: 18)
    • 7:58 - Filter by process and emit JSON

      // Report state transitions
      #import <StateReporting/StateReporting.h>
      
      NSString *domain = @"com.mygame.level";
      SRStateReporter *reporter = [SRStateReporter reporterForDomain:domain];
      
      [reporter reportTransitionToStateLabel:@"Level 1"
                              stableMetadata:nil
                            volatileMetadata:nil];
      
      [reporter reportTransitionToStateLabel:@"Level 1"
                              stableMetadata:@{ @"id": @1001 }
                            volatileMetadata:nil];
      
      [reporter reportVolatileMetadataUpdate:@{ @"health": @100 }];
    • 13:55 - Include full state transitions in overview

      metalperftrace overview /Data/MyGameTrace.atrc --include-state-transitions
      
      # [States]
      # com.mygame.graphics
      #   High (30.59%, 14.996s)  raytracing: 1  shadow: ultra
      #   Medium (69.38%, 34.012s)  raytracing: 0  shadow: medium
      # com.mygame.level
      #   Level 1 (20.47%, 10.033s)  biome: forest   id: 1001
      #   Level 2 (79.53%, 38.991s)  biome: volcano  id: 1002
    • 14:15 - Aggregate metrics by state

      # Aggregate across all domains / transitions
      metalperftrace overview /Data/MyGameTrace.atrc --aggregate
      
      # Aggregate one domain
      metalperftrace overview /Data/MyGameTrace.atrc --aggregate \
        --domain com.mygame.graphics
      
      # Aggregate a specific state label within a domain
      metalperftrace overview /Data/MyGameTrace.atrc --aggregate \
        --domain com.mygame.graphics \
        --state-label "High"

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