There is a legitimate, if rare, way to get nonReentrantCount == 0 with total != 0 — an outer zone that never terminated before the capture ended, whose reentrant inner zone did terminate. The outer never contributes to slz (no end event), but it did increment the stack count, so the inner one is correctly recorded as a reentry.
Tracy Profiler
A real time, nanosecond resolution, remote telemetry, hybrid frame and sampling profiler for games and other applications.
Tracy supports profiling CPU (Direct support is provided for C, C++, Lua, Python and Fortran integration. At the same time, third-party bindings to many other languages exist on the internet, such as Rust, Zig, C#, OCaml, Odin, etc.), GPU (All major graphics/compute APIs: OpenGL, Vulkan, Direct3D 11/12, Metal, OpenCL, CUDA, WebGPU.), memory allocations, locks, context switches, automatically attribute screenshots to captured frames, and much more.
- Documentation for usage and build process instructions
- Releases containing the documentation (
tracy.pdf) and compiled Windows x64 binaries (Tracy-<version>.7z) as assets - Changelog
- Interactive demo
An Introduction to Tracy Profiler in C++ - Marcos Slomp - CppCon 2023
Introduction to Tracy Profiler v0.2
New features in Tracy Profiler v0.3
New features in Tracy Profiler v0.4
New features in Tracy Profiler v0.5
New features in Tracy Profiler v0.6
New features in Tracy Profiler v0.7
New features in Tracy Profiler v0.8



