zccache benchmark stats

Generated 2026-07-06T13:15:13+00:00 | ref main | sha 39e4c4c10a2a | workflow run

Raw machine-readable data: latest.json and history.jsonl. Per-language README images:

Latest zccache Emscripten benchmark stats — Emscripten

Latest zccache Rust benchmark stats — Rust

Scenario	Bare compiler	sccache	zccache	bare cache	sccache cache	zccache cache	zccache vs sccache	zccache vs bare
C inline args
Single-file, Cold	2.247s	4.143s	2.590s	0 B	576 KiB	99 KiB	1.6x faster	1.2x slower
Single-file, Warm	2.267s	0.257s	0.033s	0 B	576 KiB	165 KiB	7.8x faster	68.7x faster
C++ inline args
Single-file, Cold	9.774s	12.966s	10.149s	0 B	0 B	189 KiB	1.3x faster	1.0x slower
Single-file, Warm	9.821s	0.289s	0.044s	0 B	0 B	189 KiB	6.6x faster	223.2x faster
Multi-file, Cold	9.749s	9.715s	10.028s	0 B	0 B	189 KiB	1.0x slower	1.0x slower
Multi-file, Warm	9.757s	9.743s	0.009s	0 B	0 B	189 KiB	1082.6x faster	1084.1x faster
Emscripten sibling git remap
Sibling-workspace, Warm	7.948s	0.327s	0.113s	0 B	1.8 MiB	6.5 MiB	2.9x faster	70.3x faster
Emscripten em++
Single-file, Cold	7.937s	13.566s	8.755s	0 B	0 B	133 KiB	1.6x faster	1.1x slower
Single-file, Warm	7.932s	0.326s	0.054s	0 B	0 B	133 KiB	6.0x faster	146.9x faster
Multi-file, Cold	4.099s	4.280s	4.665s	0 B	0 B	133 KiB	1.1x slower	1.1x slower
Multi-file, Warm	4.102s	4.105s	0.010s	0 B	0 B	133 KiB	410.5x faster	410.2x faster
C static-library link
Static archive, Cold	0.054s	0.057s	0.066s	0 B	0 B	185 KiB	1.2x slower	1.2x slower
Static archive, Warm	0.054s	0.055s	0.001s	0 B	0 B	189 KiB	55.0x faster	54.0x faster
C++ driver link
Driver link, Cold	0.060s	0.085s	0.070s	0 B	0 B	43 KiB	1.2x faster	1.2x slower
Driver link, Warm	0.060s	0.065s	0.001s	0 B	0 B	47 KiB	65.0x faster	60.0x faster
Emscripten link
HTML link, Cold	0.380s	0.570s	0.393s	0 B	0 B	71 KiB	1.4x faster	1.0x slower
HTML link, Warm	0.384s	0.392s	0.001s	0 B	0 B	76 KiB	392.0x faster	384.0x faster
Wasm link, Cold	0.172s	0.353s	0.175s	0 B	0 B	1.4 KiB	2.0x faster	1.0x slower
Wasm link, Warm	0.172s	0.175s	0.001s	0 B	0 B	5.7 KiB	175.0x faster	172.0x faster
Rust workspace link
Workspace staticlib link, Cold	0.049s	0.163s	0.109s	0 B	0 B	22 MiB	1.5x faster	2.2x slower
Workspace staticlib link, Warm	0.050s	0.053s	0.001s	0 B	0 B	22 MiB	53.0x faster	50.0x faster
C++ response files
Single-file RSP, Cold	9.993s	13.389s	10.588s	0 B	0 B	180 KiB	1.3x faster	1.1x slower
Single-file RSP, Warm	9.988s	0.310s	0.100s	0 B	0 B	180 KiB	3.1x faster	99.9x faster
Multi-file RSP, Cold	9.871s	9.859s	10.148s	0 B	0 B	180 KiB	1.0x slower	1.0x slower
Multi-file RSP, Warm	9.858s	9.876s	0.027s	0 B	0 B	180 KiB	365.8x faster	365.1x faster
Rust rustc
Build, Cold	1.868s	2.174s	2.041s	0 B	0 B	2.9 MiB	1.1x faster	1.1x slower
Build, Warm	1.867s	2.038s	0.171s	0 B	0 B	2.9 MiB	11.9x faster	10.9x faster
Check, Cold	1.073s	1.367s	1.167s	0 B	0 B	442 KiB	1.2x faster	1.1x slower
Check, Warm	1.059s	1.261s	0.049s	0 B	0 B	442 KiB	25.7x faster	21.6x faster
C++ sibling git remap
Sibling-workspace no __FILE__, Warm	9.769s	0.300s	0.102s	0 B	1.7 MiB	5.7 MiB	2.9x faster	95.8x faster
Sibling-workspace with __FILE__, Warm	9.774s	12.908s	0.109s	0 B	1.8 MiB	5.7 MiB	118.4x faster	89.7x faster
Rust sibling git remap
Sibling-workspace, Warm	1.869s	2.053s	0.102s	0 B	0 B	9.3 MiB	20.1x faster	18.3x faster

Environment

Runner: Linux-6.17.0-1018-azure-x86_64-with-glibc2.39
Benchmark command: soldr --no-cache cargo test -p zccache --test perf_bench_test -- --nocapture --ignored --test-threads=1
soldr: soldr 0.7.51
rustc: rustc 1.94.1 (e408947bf 2026-03-25)
clang: Ubuntu clang version 18.1.3 (1ubuntu1)
sccache: sccache 0.16.0