test(bench): SponzaBench harness + #40→HEAD perf measurement (#155)
Headless benchmark around the native Sponza RT scene: times setup and a measured Render() loop over the full multi-mesh atrium, prints BENCH metrics, and exits. Includes run-bench.sh and a README documenting the methodology and the measured net gain from #40 to current master. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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131
examples/SponzaBench/README.md
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examples/SponzaBench/README.md
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# SponzaBench — measuring the post-#40 performance work
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This example exists to answer issue **#155**: *starting with #40 a lot of
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performance-related issues were merged — what is the net performance gain,
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measured in a representative scene (Sponza)?*
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It is a headless benchmark harness built around the **native Vulkan**
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Sponza ray-tracing scene. Same asset bundle and camera as
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[`examples/Sponza`](../Sponza), but instead of opening an interactive
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window it times the work and prints machine-readable `BENCH …` lines, then
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exits.
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## What it measures
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* **setup** — process start through the first command submission: asset
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decompression, BLAS build per mesh group, the multi-instance TLAS, the
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RT pipeline, GPU memory placement and the descriptor writes. This is the
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window most of the post-#40 *native* perf work acts on.
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* **frames** — a warmup followed by a measured loop calling
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`Window::Render()`, reporting per-frame wall-clock stats and throughput.
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Unlike the interactive Sponza example — which is single-material on native
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because of the hit-shader dynamic-`descriptor_heap`-index driver fault
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(see `examples/Sponza/README.md`) — SponzaBench's closest-hit shades from
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barycentric coordinates and samples **no** texture, so it can build the
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**full multi-mesh atrium** (25 mesh groups, ~262 k triangles) as one
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multi-instance TLAS. The albedo is still decompressed and uploaded during
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setup (to keep that path in the measurement) but is not bound.
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## Running
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```bash
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cd examples/SponzaBench
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crafter-build # native Vulkan
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# from the produced bin dir:
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VK_LOADER_LAYERS_DISABLE='~all~' \
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CRAFTER_PRESENT_IMMEDIATE=1 \
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BENCH_WARMUP=200 BENCH_FRAMES=2000 BENCH_MESHES=25 ./SponzaBench
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```
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`run-bench.sh <bindir> <label> <meshes> <reps> [--cold]` runs it N times
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and reports the median / min / max of each metric.
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Environment knobs:
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| var | effect |
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|---|---|
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| `CRAFTER_PRESENT_IMMEDIATE=1` | uncapped present mode — without it FIFO pins frame time to the compositor's vblank (~60 Hz) and steady-state throughput can't be seen. |
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| `VK_LOADER_LAYERS_DISABLE='~all~'` | disable the validation layer. The engine enables Khronos validation **and GPU-assisted validation** unconditionally; that adds large, version-dependent overhead and must be off for a representative measurement. |
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| `BENCH_WARMUP` / `BENCH_FRAMES` | warmup and measured frame counts (default 200 / 2000). |
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| `BENCH_MESHES` | cap on mesh groups loaded (default: all 25). A small cap shrinks GPU work so per-frame **CPU** cost dominates; the full scene is GPU-traversal bound. |
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| `BENCH_CLEAN_EXIT=1` | exit via `std::exit` (runs `atexit`, which writes the #69 pipeline cache) instead of the default hard `_Exit`. Used once to seed `pipeline_cache.bin` for a warm-cache measurement. |
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## Results — #40 vs current master
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Measured on this repo's CI box: **NVIDIA RTX 4090**, driver `610.43.02`,
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1280×720, validation disabled, `IMMEDIATE` present, 200 warmup + 2000
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measured frames, **median of 9 runs**. "#40" is commit `1451e3a` (the #40
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merge); "HEAD" is current master. The *same* SponzaBench sources were
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built against each library revision (a git worktree at #40).
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### Full atrium — 25 meshes / ~262 k triangles (GPU-traversal bound)
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| metric | #40 | HEAD | Δ |
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|---|---:|---:|---:|
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| setup (cold) ms | 322.7 | 316.6 | **−1.9 %** |
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| setup (warm pipeline cache, #69) ms | 322.7¹ | 313.9 | **−2.7 %** |
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| throughput fps | 7 560 | 7 637 | **+1.0 %** |
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| frame time p50 ms | 0.1311 | 0.1298 | **−1.0 %** |
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| peak host RSS (cold) MB | 336.0 | 344.2 | +2.4 % |
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| peak host RSS (warm cache) MB | 336.0¹ | 332.0 | **−1.2 %** |
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¹ #40 predates the disk pipeline cache (#69), so its setup is always the
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cold-compile path.
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### Light scene — 1 mesh (deliberately CPU-bound)
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| metric | #40 | HEAD | Δ |
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|---|---:|---:|---:|
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| throughput fps | 15 022 | 15 237 | **+1.4 %** |
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| frame time p50 ms | 0.0662 | 0.0650 | **−1.8 %** |
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## Interpretation
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**The net measured gain in a static Sponza RT scene is small: ~1–2 %
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faster frames, ~2–3 % faster setup, and roughly flat host memory.** That is
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an honest result, and the reason is *what Sponza exercises*, not that the
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perf work was ineffective:
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* **Most post-#40 PRs don't touch this workload.** The largest block is UI
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/ text rendering (shaped-run cache, font-atlas dirty uploads, the UI
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compute-shader rewrites — #46–#57, #61, #122–#129, #132). Sponza has no
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UI, so those contribute **zero**. A second block optimises **per-frame
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dynamic uploads** (TLAS dirty-tracking #118, deforming-mesh refit #119,
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the staging ring #120). A *static* scene builds its TLAS once and never
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re-uploads, so these don't fire in steady state either. WebGPU-only
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(#130/#131/#133) and Win32-only (#134) PRs don't apply to a native
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Vulkan build at all.
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* **The PRs that *do* apply act on setup and memory, not frame time.**
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Device-local placement (#65/#72/#73/#75), staging release
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(#66/#67/#114), the pipeline cache (#69) and the deferred-deletion queue
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(#101/#116) move setup cost and peak memory — which is exactly where the
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measured ~2–3 % setup change and the warm-cache RSS drop show up. The
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pipeline cache itself saves ~3 ms here (one RT pipeline) and, more
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visibly, ~12 MB of peak RSS by skipping the cold shader-compile
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allocations.
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* **Steady-state frame time is GPU-traversal bound.** With 262 k triangles
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the per-frame CPU work (barrier scoping #48/#115, cached heap-bind
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structs #42/#43) is hidden behind GPU traversal, so it can't move the
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frame time. Shrinking the scene until it is CPU-bound (the light scene
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above) surfaces the per-frame CPU savings — and even then they are only
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~1.8 %, because that CPU path was already cheap.
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**Takeaway:** the post-#40 work is real but concentrated in UI/text and
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per-frame dynamic-upload paths; a static, UI-less RT scene is the wrong
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workload to see most of it. To quantify the UI/text gains a separate
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benchmark over a text-heavy `UIRenderer` scene (or an animated/deforming
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scene for the dynamic-upload PRs) would be needed.
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## Caveats / notes
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* The stock `examples/Sponza` **native** path does not currently compile
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against the (unpinned) Vulkan-Headers `main`: the
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`VkResourceDescriptorDataEXT` union no longer has the
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`pCombinedImageSampler` member the example uses. SponzaBench sidesteps
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this by not binding a combined image+sampler. (Pre-existing, unrelated to
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#155 — worth a follow-up to port Sponza to the split sampled-image +
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sampler-heap model the engine's own UI renderer already uses.)
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* Numbers are CPU/GPU specific. Re-run `run-bench.sh` locally for your
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hardware; the *deltas* between revisions are the point, not the absolute
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figures.
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16
examples/SponzaBench/closesthit.glsl
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examples/SponzaBench/closesthit.glsl
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#version 460
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#extension GL_EXT_ray_tracing : enable
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// Benchmark closest-hit: shade from the hit's barycentric coordinates.
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// SponzaBench deliberately avoids the descriptor-heap texture sample the
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// interactive Sponza example uses — the point here is to measure the
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// ray-tracing traversal + frame-loop cost, not texturing, and a
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// texture-free hit keeps the host setup portable across library
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// revisions (issue #155).
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hitAttributeEXT vec2 hitAttrs;
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layout(location = 0) rayPayloadInEXT vec3 hitValue;
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void main() {
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vec3 bary = vec3(1.0 - hitAttrs.x - hitAttrs.y, hitAttrs.x, hitAttrs.y);
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hitValue = bary;
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}
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examples/SponzaBench/main.cpp
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examples/SponzaBench/main.cpp
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// SponzaBench — headless benchmark around the native Sponza RT scene.
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//
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// Identical setup to examples/Sponza (native branch): load the Sponza
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// .cmesh + albedo .ctex, build BLAS/TLAS, wire an RTPass. Instead of
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// opening an interactive window and idling in StartSync(), it times two
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// things and exits:
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//
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// * setup — process start through the first command submission
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// (asset decompress + BLAS/TLAS build + pipeline + memory
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// placement + descriptor writes), which the bulk of the
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// post-#40 perf work targets (device-local placement,
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// staging release, pipeline cache, decompress, ...).
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// * frames — a warmup then a measured loop calling Window::Render(),
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// reporting per-frame wall-clock stats. Run with
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// CRAFTER_PRESENT_IMMEDIATE=1 to uncap from vblank.
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//
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// Tunables (env): BENCH_WARMUP (default 200), BENCH_FRAMES (default 2000).
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// Output lines are prefixed "BENCH " for easy scraping.
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#include "vulkan/vulkan.h"
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import Crafter.Graphics;
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import Crafter.Asset;
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import Crafter.Math;
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import Crafter.Event;
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import std;
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using namespace Crafter;
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namespace fs = std::filesystem;
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using Clock = std::chrono::steady_clock;
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namespace {
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struct RGBA8 { std::uint8_t r, g, b, a; };
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void RequireAssets(const fs::path& mesh, const fs::path& tex) {
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if (fs::exists(mesh) && fs::exists(tex)) return;
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std::println(std::cerr, "[SponzaBench] missing asset(s): {} / {}",
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mesh.string(), tex.string());
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std::abort();
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}
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// Peak resident set size (high-water mark) in kB, from /proc/self/status.
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long PeakRSSkB() {
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std::ifstream st("/proc/self/status");
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std::string line;
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while (std::getline(st, line)) {
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if (line.rfind("VmHWM:", 0) == 0) {
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long kb = 0;
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std::sscanf(line.c_str(), "VmHWM: %ld", &kb);
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return kb;
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}
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}
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return -1;
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}
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std::size_t EnvSize(const char* name, std::size_t fallback) {
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if (const char* v = std::getenv(name)) {
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char* end = nullptr;
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unsigned long parsed = std::strtoul(v, &end, 10);
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if (end != v) return static_cast<std::size_t>(parsed);
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}
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return fallback;
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}
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double Ms(std::chrono::nanoseconds ns) {
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return std::chrono::duration<double, std::milli>(ns).count();
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}
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}
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int main() {
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const std::size_t warmup = EnvSize("BENCH_WARMUP", 200);
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const std::size_t frames = EnvSize("BENCH_FRAMES", 2000);
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const auto tProcStart = Clock::now();
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const fs::path texPath = "tex_0.ctex";
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RequireAssets("mesh_0.cmesh", texPath);
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// scene.txt (from the asset bundle): line 1 albedoCount, line 2
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// meshCount, then per-mesh albedo index. We render every mesh group —
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// unlike the interactive Sponza example, which is single-material on
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// native because of the hit-shader dynamic-heap-index driver fault.
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// SponzaBench's hit shader samples no texture, so it can build the
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// full multi-mesh atrium as one multi-instance TLAS.
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std::uint32_t albedoCount = 0, meshCount = 0;
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{
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std::ifstream manifest("scene.txt");
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if (!manifest) { std::println(std::cerr, "[SponzaBench] missing scene.txt"); std::abort(); }
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manifest >> albedoCount >> meshCount;
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}
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// BENCH_MESHES caps the number of mesh groups loaded (default: all).
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// A small cap (e.g. 1) shrinks GPU work so per-frame CPU cost dominates;
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// the full scene is GPU (traversal) bound.
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meshCount = std::min<std::uint32_t>(meshCount, EnvSize("BENCH_MESHES", meshCount));
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CompressedTextureAsset loadedTex = LoadCompressedTexture(texPath);
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std::println("[SponzaBench] scene: {} meshes, {} albedos, {}x{} probe albedo",
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meshCount, albedoCount, loadedTex.sizeX, loadedTex.sizeY);
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Device::Initialize();
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Window window(1280, 720, "SponzaBench");
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VkCommandBuffer cmd = window.StartInit();
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DescriptorHeapVulkan descriptorHeap;
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descriptorHeap.Initialize(/*images*/ 2, /*buffers*/ 1, /*samplers*/ 0);
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VkSpecializationMapEntry raygenEntry = { .constantID = 0, .offset = 0, .size = sizeof(std::uint16_t) };
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VkSpecializationInfo raygenSpec = {
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.mapEntryCount = 1, .pMapEntries = &raygenEntry,
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.dataSize = sizeof(std::uint16_t), .pData = &descriptorHeap.bufferStartElement,
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};
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auto imgSlots = descriptorHeap.AllocateImageSlots(1);
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auto bufSlots = descriptorHeap.AllocateBufferSlots(1);
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std::array<VulkanShader, 3> shaders {{
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{ "raygen.spv", "main", VK_SHADER_STAGE_RAYGEN_BIT_KHR, &raygenSpec },
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{ "miss.spv", "main", VK_SHADER_STAGE_MISS_BIT_KHR, nullptr },
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{ "closesthit.spv", "main", VK_SHADER_STAGE_CLOSEST_HIT_BIT_KHR, nullptr },
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}};
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ShaderBindingTableVulkan shaderTable;
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shaderTable.Init(shaders);
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std::array<VkRayTracingShaderGroupCreateInfoKHR, 1> raygenGroups {{ {
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.sType = VK_STRUCTURE_TYPE_RAY_TRACING_SHADER_GROUP_CREATE_INFO_KHR,
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.type = VK_RAY_TRACING_SHADER_GROUP_TYPE_GENERAL_KHR,
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.generalShader = 0, .closestHitShader = VK_SHADER_UNUSED_KHR,
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.anyHitShader = VK_SHADER_UNUSED_KHR, .intersectionShader = VK_SHADER_UNUSED_KHR,
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} }};
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std::array<VkRayTracingShaderGroupCreateInfoKHR, 1> missGroups {{ {
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.sType = VK_STRUCTURE_TYPE_RAY_TRACING_SHADER_GROUP_CREATE_INFO_KHR,
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.type = VK_RAY_TRACING_SHADER_GROUP_TYPE_GENERAL_KHR,
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.generalShader = 1, .closestHitShader = VK_SHADER_UNUSED_KHR,
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.anyHitShader = VK_SHADER_UNUSED_KHR, .intersectionShader = VK_SHADER_UNUSED_KHR,
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} }};
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std::array<VkRayTracingShaderGroupCreateInfoKHR, 1> hitGroups {{ {
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.sType = VK_STRUCTURE_TYPE_RAY_TRACING_SHADER_GROUP_CREATE_INFO_KHR,
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.type = VK_RAY_TRACING_SHADER_GROUP_TYPE_TRIANGLES_HIT_GROUP_KHR,
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.generalShader = VK_SHADER_UNUSED_KHR, .closestHitShader = 2,
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.anyHitShader = VK_SHADER_UNUSED_KHR, .intersectionShader = VK_SHADER_UNUSED_KHR,
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} }};
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PipelineRTVulkan pipeline;
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pipeline.Init(cmd, raygenGroups, missGroups, hitGroups, shaderTable);
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// One Mesh + RenderingElement3D per mesh group → BLAS each, then a
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// single multi-instance TLAS. Pointers handed to RenderingElement3D
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// live in the static vectors, so reserve up-front: a reallocation
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// would dangle every registered element.
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static std::vector<Mesh> meshes;
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static std::vector<RenderingElement3D> renderers;
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meshes.reserve(meshCount);
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renderers.reserve(meshCount);
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||||||
|
std::uint64_t totalVerts = 0, totalIdx = 0;
|
||||||
|
for (std::uint32_t i = 0; i < meshCount; ++i) {
|
||||||
|
const fs::path mp = std::format("mesh_{}.cmesh", i);
|
||||||
|
if (!fs::exists(mp)) continue;
|
||||||
|
CompressedMeshAsset loaded = LoadCompressedMesh(mp);
|
||||||
|
totalVerts += loaded.vertexCount;
|
||||||
|
totalIdx += loaded.indexCount;
|
||||||
|
meshes.emplace_back();
|
||||||
|
meshes.back().Build(loaded, cmd);
|
||||||
|
|
||||||
|
renderers.emplace_back();
|
||||||
|
RenderingElement3D& r = renderers.back();
|
||||||
|
r.instance = {
|
||||||
|
.transform = {},
|
||||||
|
.instanceCustomIndex = 0,
|
||||||
|
.mask = 0xFF,
|
||||||
|
.instanceShaderBindingTableRecordOffset = 0,
|
||||||
|
.flags = VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_KHR,
|
||||||
|
.accelerationStructureReference = meshes.back().blasAddr,
|
||||||
|
};
|
||||||
|
MatrixRowMajor<float, 4, 3, 1>::Identity()
|
||||||
|
.Store(reinterpret_cast<float*>(r.instance.transform.matrix));
|
||||||
|
RenderingElement3D::Add(&r);
|
||||||
|
}
|
||||||
|
std::println("[SponzaBench] built {} BLAS, {} verts, {} idx total",
|
||||||
|
renderers.size(), totalVerts, totalIdx);
|
||||||
|
|
||||||
|
Image2D<RGBA8> albedo;
|
||||||
|
albedo.Create(loadedTex.sizeX, loadedTex.sizeY, /*mipLevels*/ 1, cmd,
|
||||||
|
VK_FORMAT_R8G8B8A8_UNORM,
|
||||||
|
VK_IMAGE_USAGE_TRANSFER_DST_BIT | VK_IMAGE_USAGE_SAMPLED_BIT,
|
||||||
|
VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
|
||||||
|
albedo.Update(loadedTex, cmd, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
|
||||||
|
// The albedo is uploaded to keep the texture-decompress + staging
|
||||||
|
// setup path in the measured "setup" window, but is not bound — the
|
||||||
|
// closest-hit shades from barycentrics, so only the TLAS + per-frame
|
||||||
|
// output image need descriptors.
|
||||||
|
|
||||||
|
for (std::uint32_t f = 0; f < Window::numFrames; ++f)
|
||||||
|
RenderingElement3D::BuildTLAS(cmd, f);
|
||||||
|
|
||||||
|
window.FinishInit();
|
||||||
|
|
||||||
|
VkDeviceAddressRangeKHR tlasRanges[Window::numFrames];
|
||||||
|
VkImageDescriptorInfoEXT outImgInfos[Window::numFrames];
|
||||||
|
for (std::uint32_t f = 0; f < Window::numFrames; ++f) {
|
||||||
|
tlasRanges[f] = { .address = RenderingElement3D::tlases[f].address };
|
||||||
|
outImgInfos[f] = {
|
||||||
|
.sType = VK_STRUCTURE_TYPE_IMAGE_DESCRIPTOR_INFO_EXT,
|
||||||
|
.pView = &window.imageViews[f],
|
||||||
|
.layout = VK_IMAGE_LAYOUT_GENERAL,
|
||||||
|
};
|
||||||
|
}
|
||||||
|
|
||||||
|
std::vector<VkResourceDescriptorInfoEXT> resources;
|
||||||
|
std::vector<VkHostAddressRangeEXT> destinations;
|
||||||
|
resources.reserve(Window::numFrames * 2);
|
||||||
|
destinations.reserve(Window::numFrames * 2);
|
||||||
|
for (std::uint32_t f = 0; f < Window::numFrames; ++f) {
|
||||||
|
resources.push_back({
|
||||||
|
.sType = VK_STRUCTURE_TYPE_RESOURCE_DESCRIPTOR_INFO_EXT,
|
||||||
|
.type = VK_DESCRIPTOR_TYPE_ACCELERATION_STRUCTURE_KHR,
|
||||||
|
.data = { .pAddressRange = &tlasRanges[f] },
|
||||||
|
});
|
||||||
|
destinations.push_back({
|
||||||
|
.address = descriptorHeap.resourceHeap[f].value
|
||||||
|
+ descriptorHeap.BufferByteOffset(bufSlots.firstElement),
|
||||||
|
.size = Device::descriptorHeapProperties.bufferDescriptorSize,
|
||||||
|
});
|
||||||
|
resources.push_back({
|
||||||
|
.sType = VK_STRUCTURE_TYPE_RESOURCE_DESCRIPTOR_INFO_EXT,
|
||||||
|
.type = VK_DESCRIPTOR_TYPE_STORAGE_IMAGE,
|
||||||
|
.data = { .pImage = &outImgInfos[f] },
|
||||||
|
});
|
||||||
|
destinations.push_back({
|
||||||
|
.address = descriptorHeap.resourceHeap[f].value
|
||||||
|
+ descriptorHeap.ImageByteOffset(imgSlots.firstElement),
|
||||||
|
.size = Device::descriptorHeapProperties.imageDescriptorSize,
|
||||||
|
});
|
||||||
|
}
|
||||||
|
Device::vkWriteResourceDescriptorsEXT(Device::device,
|
||||||
|
static_cast<std::uint32_t>(resources.size()),
|
||||||
|
resources.data(), destinations.data());
|
||||||
|
for (std::uint32_t f = 0; f < Window::numFrames; ++f) {
|
||||||
|
descriptorHeap.resourceHeap[f].FlushDevice();
|
||||||
|
}
|
||||||
|
|
||||||
|
window.descriptorHeap = &descriptorHeap;
|
||||||
|
RTPass rtPass(&pipeline);
|
||||||
|
window.passes.push_back(&rtPass);
|
||||||
|
|
||||||
|
// ── Setup complete. Everything above is the per-run, one-time cost. ──
|
||||||
|
const auto tSetupDone = Clock::now();
|
||||||
|
const double setupMs = Ms(tSetupDone - tProcStart);
|
||||||
|
|
||||||
|
// ── Warmup: let the pipeline fill (frames-in-flight), caches warm. ──
|
||||||
|
for (std::size_t i = 0; i < warmup; ++i) window.Render();
|
||||||
|
|
||||||
|
// ── Measured loop: per-frame wall-clock around Render(). ────────────
|
||||||
|
std::vector<double> frameMs;
|
||||||
|
frameMs.reserve(frames);
|
||||||
|
const auto tLoopStart = Clock::now();
|
||||||
|
for (std::size_t i = 0; i < frames; ++i) {
|
||||||
|
const auto a = Clock::now();
|
||||||
|
window.Render();
|
||||||
|
const auto b = Clock::now();
|
||||||
|
frameMs.push_back(Ms(b - a));
|
||||||
|
}
|
||||||
|
const auto tLoopEnd = Clock::now();
|
||||||
|
// Drain so the loop's wall-clock isn't charged the GPU tail of the
|
||||||
|
// last few in-flight frames inconsistently across runs.
|
||||||
|
vkQueueWaitIdle(Device::queue);
|
||||||
|
|
||||||
|
const long peakRSS = PeakRSSkB();
|
||||||
|
|
||||||
|
// ── Stats. throughput uses the loop wall-clock (steady-state FPS);
|
||||||
|
// per-frame percentiles use the sorted per-frame samples. ─────────
|
||||||
|
const double loopWallMs = Ms(tLoopEnd - tLoopStart);
|
||||||
|
std::sort(frameMs.begin(), frameMs.end());
|
||||||
|
auto pct = [&](double p) {
|
||||||
|
if (frameMs.empty()) return 0.0;
|
||||||
|
std::size_t idx = static_cast<std::size_t>(p * (frameMs.size() - 1));
|
||||||
|
return frameMs[idx];
|
||||||
|
};
|
||||||
|
double sum = 0.0; for (double v : frameMs) sum += v;
|
||||||
|
const double meanMs = frameMs.empty() ? 0.0 : sum / frameMs.size();
|
||||||
|
|
||||||
|
std::println("");
|
||||||
|
std::println("BENCH setup_ms {:.3f}", setupMs);
|
||||||
|
std::println("BENCH frames {}", frames);
|
||||||
|
std::println("BENCH loop_wall_ms {:.3f}", loopWallMs);
|
||||||
|
std::println("BENCH fps {:.1f}", frames / (loopWallMs / 1000.0));
|
||||||
|
std::println("BENCH frame_mean_ms {:.4f}", meanMs);
|
||||||
|
std::println("BENCH frame_min_ms {:.4f}", pct(0.0));
|
||||||
|
std::println("BENCH frame_p50_ms {:.4f}", pct(0.50));
|
||||||
|
std::println("BENCH frame_p99_ms {:.4f}", pct(0.99));
|
||||||
|
std::println("BENCH frame_max_ms {:.4f}", pct(1.0));
|
||||||
|
std::println("BENCH peak_rss_kb {}", peakRSS);
|
||||||
|
|
||||||
|
// The interactive Sponza example never tears Device/Window down (it
|
||||||
|
// loops in StartSync forever); doing so here races GPU-still-in-flight
|
||||||
|
// resources at static-destruction time. The measurement is already
|
||||||
|
// printed, so skip destructors entirely with a hard exit.
|
||||||
|
//
|
||||||
|
// BENCH_CLEAN_EXIT=1 instead exits via std::exit, which runs atexit
|
||||||
|
// handlers (on builds that have the disk pipeline cache, #69, this is
|
||||||
|
// where it is written) before the destructor teardown. Used once to
|
||||||
|
// seed pipeline_cache.bin for a warm-cache setup measurement; the
|
||||||
|
// subsequent destructor race is irrelevant since the data is flushed.
|
||||||
|
std::cout.flush();
|
||||||
|
if (std::getenv("BENCH_CLEAN_EXIT")) std::exit(0);
|
||||||
|
std::_Exit(0);
|
||||||
|
}
|
||||||
11
examples/SponzaBench/miss.glsl
Normal file
11
examples/SponzaBench/miss.glsl
Normal file
|
|
@ -0,0 +1,11 @@
|
||||||
|
#version 460
|
||||||
|
#extension GL_EXT_ray_tracing : enable
|
||||||
|
|
||||||
|
layout(location = 0) rayPayloadInEXT vec3 hitValue;
|
||||||
|
|
||||||
|
void main() {
|
||||||
|
// Soft sky gradient based on ray direction Y. The actual ray dir
|
||||||
|
// isn't accessible without an extra payload field; use a flat warm
|
||||||
|
// tone that matches Sponza's interior lighting.
|
||||||
|
hitValue = vec3(0.10, 0.08, 0.06);
|
||||||
|
}
|
||||||
60
examples/SponzaBench/project.cpp
Normal file
60
examples/SponzaBench/project.cpp
Normal file
|
|
@ -0,0 +1,60 @@
|
||||||
|
import std;
|
||||||
|
import Crafter.Build;
|
||||||
|
namespace fs = std::filesystem;
|
||||||
|
using namespace Crafter;
|
||||||
|
|
||||||
|
// SponzaBench — a headless benchmark harness around the native Sponza
|
||||||
|
// ray-tracing scene. Same asset bundle and shaders as examples/Sponza,
|
||||||
|
// but main.cpp times setup + a fixed measured frame loop instead of
|
||||||
|
// opening an interactive window. Native (Vulkan) only — the point is to
|
||||||
|
// measure the native renderer's per-frame and setup cost across library
|
||||||
|
// revisions (issue #155: net perf gain from #40 to now).
|
||||||
|
constexpr std::string_view kSponzaGitUrl = "https://github.com/jimmiebergmann/Sponza.git";
|
||||||
|
constexpr std::string_view kSponzaCommitSHA = "222338979d32f4f4818466291bdbc29f192b86ba";
|
||||||
|
constexpr std::uint16_t kAlbedoSize = 1024u;
|
||||||
|
|
||||||
|
extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> args) {
|
||||||
|
std::vector<std::string> graphicsArgs(args.begin(), args.end());
|
||||||
|
Configuration* graphics = LocalProject({
|
||||||
|
.projectFile = "../../project.cpp",
|
||||||
|
.args = graphicsArgs,
|
||||||
|
});
|
||||||
|
|
||||||
|
Configuration cfg;
|
||||||
|
cfg.path = "./";
|
||||||
|
cfg.name = "SponzaBench";
|
||||||
|
cfg.outputName = "SponzaBench";
|
||||||
|
cfg.type = ConfigurationType::Executable;
|
||||||
|
ApplyStandardArgs(cfg, args);
|
||||||
|
cfg.dependencies = { graphics };
|
||||||
|
|
||||||
|
std::array<fs::path, 0> ifaces = {};
|
||||||
|
std::array<fs::path, 1> impls = { "main" };
|
||||||
|
cfg.GetInterfacesAndImplementations(ifaces, impls);
|
||||||
|
|
||||||
|
fs::path sponzaRoot = GitFetch({
|
||||||
|
.url = std::string(kSponzaGitUrl),
|
||||||
|
.commit = std::string(kSponzaCommitSHA),
|
||||||
|
});
|
||||||
|
std::string bundleKey = std::format("{}|{}", kSponzaCommitSHA, kAlbedoSize);
|
||||||
|
auto bundleHash = std::hash<std::string>{}(bundleKey);
|
||||||
|
fs::path bundleDir = fs::path("build") / std::format("sponza-bundle-{:016x}", bundleHash);
|
||||||
|
|
||||||
|
if (auto err = BuildOBJBundle(
|
||||||
|
sponzaRoot / "sponza.obj",
|
||||||
|
sponzaRoot / "sponza.mtl",
|
||||||
|
bundleDir,
|
||||||
|
kAlbedoSize); !err.empty()) {
|
||||||
|
std::println(std::cerr, "Sponza bundle error: {}", err);
|
||||||
|
std::exit(1);
|
||||||
|
}
|
||||||
|
|
||||||
|
for (const auto& entry : fs::directory_iterator(bundleDir)) {
|
||||||
|
if (entry.is_regular_file()) cfg.files.push_back(entry.path());
|
||||||
|
}
|
||||||
|
|
||||||
|
cfg.shaders.emplace_back(fs::path("raygen.glsl"), std::string("main"), ShaderType::RayGen);
|
||||||
|
cfg.shaders.emplace_back(fs::path("closesthit.glsl"), std::string("main"), ShaderType::ClosestHit);
|
||||||
|
cfg.shaders.emplace_back(fs::path("miss.glsl"), std::string("main"), ShaderType::Miss);
|
||||||
|
return cfg;
|
||||||
|
}
|
||||||
52
examples/SponzaBench/raygen.glsl
Normal file
52
examples/SponzaBench/raygen.glsl
Normal file
|
|
@ -0,0 +1,52 @@
|
||||||
|
#version 460
|
||||||
|
#extension GL_EXT_ray_tracing : enable
|
||||||
|
#extension GL_EXT_shader_image_load_formatted : enable
|
||||||
|
#extension GL_EXT_shader_explicit_arithmetic_types_int16 : enable
|
||||||
|
#extension GL_EXT_descriptor_heap : enable
|
||||||
|
#extension GL_EXT_nonuniform_qualifier : enable
|
||||||
|
|
||||||
|
// Specialization constant set from descriptorHeap.bufferStartElement —
|
||||||
|
// shared with closesthit.glsl. The TLAS lives at descriptor_heap slot
|
||||||
|
// `bufferStart` (it's an SSBO-typed entry), the per-frame output image
|
||||||
|
// at heap slot 0.
|
||||||
|
layout(constant_id = 0) const uint16_t bufferStart = 0us;
|
||||||
|
layout(descriptor_heap) uniform accelerationStructureEXT topLevelAS[];
|
||||||
|
layout(descriptor_heap) uniform writeonly image2D image[];
|
||||||
|
|
||||||
|
layout(location = 0) rayPayloadEXT vec3 hitValue;
|
||||||
|
|
||||||
|
void main() {
|
||||||
|
uvec2 pixel = gl_LaunchIDEXT.xy;
|
||||||
|
uvec2 resolution = gl_LaunchSizeEXT.xy;
|
||||||
|
vec2 uv = (vec2(pixel) + 0.5) / vec2(resolution);
|
||||||
|
vec2 ndc = uv * 2.0 - 1.0;
|
||||||
|
|
||||||
|
// Camera positioned to look down the Sponza atrium axis. Sponza-OBJ
|
||||||
|
// from McGuire's archive is roughly 30 units wide × 13 tall × 18 deep,
|
||||||
|
// axis-aligned, with the floor near y=0 and the atrium centered on
|
||||||
|
// origin. -X faces the long end, so we sit inside looking +X.
|
||||||
|
vec3 origin = vec3(-10.0, 5.0, 0.0);
|
||||||
|
float aspect = float(resolution.x) / float(resolution.y);
|
||||||
|
float fov = radians(70.0);
|
||||||
|
float tanHalf = tan(fov * 0.5);
|
||||||
|
vec3 direction = normalize(vec3(
|
||||||
|
ndc.x * aspect * tanHalf,
|
||||||
|
-ndc.y * tanHalf,
|
||||||
|
1.0));
|
||||||
|
|
||||||
|
// Rotate +Z forward → +X forward (90° about Y).
|
||||||
|
direction = vec3(direction.z, direction.y, -direction.x);
|
||||||
|
|
||||||
|
traceRayEXT(
|
||||||
|
topLevelAS[bufferStart],
|
||||||
|
gl_RayFlagsNoneEXT,
|
||||||
|
0xff,
|
||||||
|
0, 0, 0,
|
||||||
|
origin,
|
||||||
|
0.001,
|
||||||
|
direction,
|
||||||
|
10000.0,
|
||||||
|
0);
|
||||||
|
|
||||||
|
imageStore(image[0], ivec2(pixel), vec4(hitValue, 1.0));
|
||||||
|
}
|
||||||
40
examples/SponzaBench/run-bench.sh
Executable file
40
examples/SponzaBench/run-bench.sh
Executable file
|
|
@ -0,0 +1,40 @@
|
||||||
|
#!/usr/bin/env bash
|
||||||
|
# Repeated-measurement harness for SponzaBench. Runs the binary in $BINDIR
|
||||||
|
# REPS times for a given mesh cap and reports the median (and min/max) of
|
||||||
|
# each BENCH metric. Validation is force-disabled via the loader (it adds
|
||||||
|
# huge, version-dependent overhead) and present mode is uncapped so frame
|
||||||
|
# time reflects real work rather than the compositor's vblank.
|
||||||
|
#
|
||||||
|
# Usage: run-bench.sh <bindir> <label> <meshes> <reps> [--cold]
|
||||||
|
# --cold deletes pipeline_cache.bin before EACH run (cold-compile path).
|
||||||
|
set -u
|
||||||
|
BINDIR="$1"; LABEL="$2"; MESHES="$3"; REPS="$4"; COLD="${5:-}"
|
||||||
|
cd "$BINDIR" || exit 1
|
||||||
|
|
||||||
|
declare -A vals
|
||||||
|
metrics="setup_ms fps frame_mean_ms frame_p50_ms frame_p99_ms peak_rss_kb"
|
||||||
|
for m in $metrics; do vals[$m]=""; done
|
||||||
|
|
||||||
|
for ((i=0;i<REPS;i++)); do
|
||||||
|
[ "$COLD" = "--cold" ] && rm -f pipeline_cache.bin
|
||||||
|
out=$(VK_LOADER_LAYERS_DISABLE='~all~' CRAFTER_PRESENT_IMMEDIATE=1 \
|
||||||
|
BENCH_WARMUP=200 BENCH_FRAMES=2000 BENCH_MESHES="$MESHES" \
|
||||||
|
./SponzaBench 2>/dev/null)
|
||||||
|
for m in $metrics; do
|
||||||
|
v=$(echo "$out" | awk -v k="$m" '$1=="BENCH" && $2==k {print $3}')
|
||||||
|
vals[$m]="${vals[$m]} $v"
|
||||||
|
done
|
||||||
|
done
|
||||||
|
|
||||||
|
med() { tr ' ' '\n' | grep -v '^$' | sort -n | awk '{a[NR]=$1} END{print a[int((NR+1)/2)]}'; }
|
||||||
|
lo() { tr ' ' '\n' | grep -v '^$' | sort -n | head -1; }
|
||||||
|
hi() { tr ' ' '\n' | grep -v '^$' | sort -n | tail -1; }
|
||||||
|
|
||||||
|
echo "## $LABEL (meshes=$MESHES reps=$REPS ${COLD})"
|
||||||
|
printf "%-15s %12s %12s %12s\n" metric median min max
|
||||||
|
for m in $metrics; do
|
||||||
|
echo -n "$(printf '%-15s' "$m") "
|
||||||
|
printf "%12s %12s %12s\n" \
|
||||||
|
"$(echo "${vals[$m]}" | med)" "$(echo "${vals[$m]}" | lo)" "$(echo "${vals[$m]}" | hi)"
|
||||||
|
done
|
||||||
|
echo
|
||||||
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Add table
Add a link
Reference in a new issue