Tools for Investigating Graphics System Performance |
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Tools for Investigating Graphics System Performance
содержание презентации «Tools for Investigating Graphics System Performance.ppt»| Сл | Текст | Сл | Текст |
| 1 | Tools for Investigating Graphics | 13 | forcing applications to share control of |
| System Performance. Matthew Fisher Steve | graphics memory and compute resources. | ||
| Pronovost. | 14 | GPUView. The graphics model switch | |
| 2 | Goal. A video game runs slowly, skips | induced a variety of constraints on | |
| frames, has high latency, etc. and the | graphics applications and forced highly | ||
| developers want to fix this problem The | optimized graphics drivers to be | ||
| problem is almost always a cascade of | restructured Many games were running more | ||
| bottlenecks at the application, CPU, and | slowly on Vista than they did on XP (~5% - | ||
| GPU levels that is very challenging to | 30% slower) GPUView was designed to help | ||
| investigate locally We want tools that | investigate these problems and see what | ||
| lets programmers solve these problems | stage was causing the speed difference. | ||
| faster. | 15 | Event Tracing. The GPUView logger | |
| 3 | Approaches. Profiling Rig the game | enables logging of a vast set of events in | |
| events with logging or use an automatic | the OS, such as All calls to the Windows | ||
| profiler PIX (for Windows and Xbox 360) | graphics kernel All resource creation, | ||
| All calls by the game to the graphics API | lock, destruction, etc. events All command | ||
| are logged GPUView OS logs all CPU, | buffer submissions Context switches (w/ | ||
| graphics kernel and graphics driver | stack trace and reason) Kernel mode | ||
| events. | enter/exits (w/ stack trace) World of | ||
| 4 | Profiling. Manual profiling requires a | Warcraft generates approximately 1GB every | |
| significant amount of development effort | 3 seconds. | ||
| Polling-based automatic profiling can work | 16 | GPUView Without Any Graphics. | |
| reasonably well for CPU applications but | 17 | Windows Display Driver Model. | |
| doesn’t capture graphics or memory | Applications build up local command | ||
| transfer events well Percentage-based | buffers When these command buffers get big | ||
| statistics (“you spent 45% of the time in | enough they are submitted to the | ||
| function X”) can sometimes be useful and | application’s local graphics queue for | ||
| sometimes extremely misleading. | processing The graphics scheduler selects | ||
| 5 | PIX. Released by Microsoft as part of | which application should be running on | |
| the DirectX SDK Multiple modes for | which graphics card and submits work to | ||
| investigating performance targeted at game | the corresponding hardware queue. | ||
| developers Interactive mode Frame logging | 18 | One Second of a Game. | |
| Frame capture and playback. | 19 | ||
| 6 | PIX – Interactive Mode. Various | 20 | |
| counters stream by as the game runs You | 21 | Setup. | |
| can change the counters, hope is to find | 22 | Multiple Applications Fighting. | |
| that the observed problem correlates with | 23 | Simple Problems. | |
| one of the counters. | 24 | Relatively Normal Execution. | |
| 7 | PIX – Interactive Mode. | 25 | GPU Starvation. |
| 8 | Commonly Used Counter Types. Number, | 26 | GPU Idle. |
| type, and size of draw primitive calls | 27 | Sleepy App. | |
| Number of texture, vertex/index buffer | 28 | Huge Render Times (GPU Bound). | |
| locks, and what memory pool was locked | 29 | GPU and CPU Starvation. | |
| Object creation and destruction events | 30 | Answering Questions. | |
| Allocated system and video memory Frame | 31 | Why Did Our Thread Context Switch? | |
| latency, seconds per frame Page faults. | 32 | Does Surface Allocation Cause Frame | |
| 9 | PIX – Frame Capture Mode. | Stuttering? | |
| 10 | PIX – Debug Pixel. | 33 | Thoughts. Surprisingly, the overhead |
| 11 | Questions PIX is good at. Are object | of GPUView logging is pretty minimal and | |
| locks causing the frame skipping problem | the traces often reflect the underlying | ||
| users are experiencing? Are we allocating | problem well The biggest advantage of | ||
| too many resources we don’t use? What are | GPUView over PIX is that PIX can’t tell | ||
| the API calls that are taking the longest | you crucial things like when the GPU is | ||
| time to execute? Why was this pixel in the | blocked on the CPU GPUView is excellent | ||
| sky green? | for telling you what part of the | ||
| 12 | GPUView. | application needs optimization. | |
| 13 | Windows Display Driver Model. The XP | 34 | Driver Perspective. Provides a lot of |
| Display Driver Model required applications | detail to let display driver writers and | ||
| to cede control of the graphics | the DirectX graphics kernel diagnose | ||
| infrastructure and was largely designed | problems with task submission, the command | ||
| assuming a single 3D application would be | buffer submission threads, GPU preemption, | ||
| running The Vista Display Driver Model | video skipping, etc. | ||
| added standard scheduling principles | |||
| Tools for Investigating Graphics System Performance.ppt | |||
Tools for Investigating Graphics System Performance
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