tracy/tests/cuda/repro/graph

Tracy CUDA Graph GPU Zone Repro

Demonstrates that unpatched Tracy fails to show GPU zones for kernels launched via CUDA Graphs (cudaGraphLaunch).

Root cause

When kernels are launched through CUDA Graphs, CUPTI delivers CONCURRENT_KERNEL and MEMCPY activity records but no corresponding API callback fires for the individual kernel launches. Tracy's matchActivityToAPICall() always fails, and matchError() silently drops every GPU zone.

Build and run

cmake -S . -B ./build
cmake --build ./build --parallel --config Release
ctest --test-dir ./build -C Release -R repro

What to expect

Tracy version	GPU zones shown
Unpatched	0
Patched (cuda-graph-gpu-zones.patch)	~30 (10 launches x 3 ops)

The graph structure

Each graph launch contains:

1. vector_add kernel (c = a + b)
2. Device-to-device memcpy
3. vector_add kernel (c = a + c)

The graph is launched 10 times, so 30 GPU operations total.