zccache benchmark stats

Generated 2026-10-07T16:36:04+00:00 | ref main | sha d25697216e08 | ZCCACHE_MODE=REFLINK_OR_LINK_OR_COPY | 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	1.703s	3.218s	1.951s	0 B	576 KiB	127 KiB	1.6x faster	1.1x slower
Single-file, Warm	1.685s	119.71ms	6.022ms	0 B	576 KiB	212 KiB	19.9x faster	279.9x faster
C static-library link
Static archive, Cold	39.785ms	42.43ms	44.186ms	0 B	0 B	185 KiB	n/a	1.1x slower
Static archive, Warm	40.706ms	40.68ms	0.273ms	0 B	0 B	190 KiB	n/a	149.3x faster
C++ inline args
Single-file, Cold	4.610s	6.929s	5.055s	0 B	907 KiB	874 KiB	1.4x faster	1.1x slower
Single-file, Warm	4.574s	151.778ms	6.318ms	0 B	907 KiB	960 KiB	24.0x faster	723.9x faster
Multi-file, Cold (per-TU)	4.633s	6.997s	5.114s	0 B	907 KiB	230 KiB	1.4x faster	1.1x slower
Multi-file, Warm	4.525s	4.726s	7.68ms	0 B	0 B	236 KiB	n/a	589.2x faster
C++ response files
Single-file RSP, Cold	4.961s	7.434s	5.351s	0 B	919 KiB	1.3 MiB	1.4x faster	1.1x slower
Single-file RSP, Warm	4.851s	173.22ms	20.881ms	0 B	919 KiB	1.3 MiB	8.3x faster	232.3x faster
Multi-file RSP, Cold (per-TU)	4.815s	7.471s	5.393s	0 B	919 KiB	225 KiB	1.4x faster	1.1x slower
Multi-file RSP, Warm	4.695s	4.923s	12.184ms	0 B	0 B	226 KiB	n/a	385.4x faster
Emscripten em++
Single-file, Cold	4.931s	8.796s	5.244s	0 B	1.8 MiB	1.9 MiB	1.7x faster	1.1x slower
Single-file, Warm	4.792s	191.359ms	7.484ms	0 B	1.8 MiB	2.0 MiB	25.6x faster	640.3x faster
Multi-file, Cold (per-TU)	4.632s	8.812s	2.601s	0 B	1.8 MiB	172 KiB	3.4x faster	1.8x faster
Multi-file, Warm	2.059s	2.131s	8.024ms	0 B	0 B	177 KiB	n/a	256.6x faster
C++ driver link
Driver link, Cold	51.85ms	109.083ms	54.298ms	0 B	0 B	977 B	n/a	1.0x slower
Driver link, Warm	50.893ms	54.441ms	0.222ms	0 B	0 B	48 KiB	n/a	229.6x faster
Emscripten link
HTML link, Cold	274.347ms	522.344ms	276.59ms	0 B	0 B	1012 B	n/a	1.0x slower
HTML link, Warm	264.386ms	266.043ms	0.287ms	0 B	0 B	77 KiB	n/a	922.6x faster
Wasm link, Cold	127.14ms	396.085ms	129.43ms	0 B	0 B	1012 B	n/a	1.0x slower
Wasm link, Warm	125.676ms	130.174ms	0.2ms	0 B	0 B	6.5 KiB	n/a	629.9x faster
Rust workspace link
Workspace staticlib link, Cold	30.489ms	97.849ms	77.157ms	0 B	0 B	31.8 MiB	1.3x faster	2.5x slower
Workspace staticlib link, Warm	30.349ms	33.084ms	11.032ms	0 B	0 B	46.6 MiB	n/a	2.8x faster
Rust rustc
Build, Cold	1.349s	2.531s	1.440s	0 B	1.0 MiB	2.9 MiB	1.8x faster	1.1x slower
Build, Warm	1.339s	1.034s	23.111ms	0 B	1.0 MiB	3.0 MiB	44.7x faster	57.9x faster
Check, Cold	738.672ms	1.880s	897.857ms	0 B	104 KiB	378 KiB	2.1x faster	1.2x slower
Check, Warm	724.145ms	1.035s	18.73ms	0 B	104 KiB	515 KiB	55.3x faster	38.7x faster
C++ sibling git remap
Sibling-workspace no __FILE__, Warm	4.924s	158.183ms	12.569ms	0 B	1.7 MiB	1.3 MiB	12.6x faster	391.7x faster
Sibling-workspace with __FILE__, Warm	4.935s	7.114s	13.451ms	0 B	1.8 MiB	1.3 MiB	n/a	366.9x faster
Emscripten sibling git remap
Sibling-workspace, Warm	4.791s	198.838ms	13.834ms	0 B	1.8 MiB	2.4 MiB	14.4x faster	346.3x faster
Rust sibling git remap
Sibling-workspace, Warm	1.365s	1.045s	21.029ms	0 B	1.0 MiB	3.4 MiB	49.7x faster	64.9x faster

Environment

Runner: Linux-6.17.0-1022-azure-x86_64-with-glibc2.39
Benchmark command: soldr --no-cache cargo test --release -p zccache --test perf_bench_test -- perf_c_zccache_vs_bare --nocapture --ignored --test-threads=1 ; soldr --no-cache cargo test --release -p zccache --test perf_bench_test -- perf_c_archive_link --nocapture --ignored --test-threads=1 ; soldr --no-cache cargo test --release -p zccache --test perf_bench_test -- perf_warm_cache_zccache_vs_sccache --nocapture --ignored --test-threads=1 ; soldr --no-cache cargo test --release -p zccache --test perf_bench_test -- perf_response_file --nocapture --ignored --test-threads=1 ; soldr --no-cache cargo test --release -p zccache --test perf_bench_test -- perf_cpp_sibling_remap_warm --nocapture --ignored --test-threads=1 ; soldr --no-cache cargo test --release -p zccache --test perf_bench_test -- perf_cpp_driver_link --nocapture --ignored --test-threads=1 ; soldr --no-cache cargo test --release -p zccache --test perf_bench_test -- perf_emcc_warm_cache_zccache_vs_sccache --nocapture --ignored --test-threads=1 ; soldr --no-cache cargo test --release -p zccache --test perf_bench_test -- perf_emcc_sibling_remap_warm --nocapture --ignored --test-threads=1 ; soldr --no-cache cargo test --release -p zccache --test perf_bench_test -- perf_emcc_link --nocapture --ignored --test-threads=1 ; soldr --no-cache cargo test --release -p zccache --test perf_bench_test -- perf_rustc_zccache_vs_sccache --nocapture --ignored --test-threads=1 ; soldr --no-cache cargo test --release -p zccache --test perf_bench_test -- perf_rustc_sibling_remap_warm --nocapture --ignored --test-threads=1 ; soldr --no-cache cargo test --release -p zccache --test perf_bench_test -- perf_rust_workspace_link --nocapture --ignored --test-threads=1
soldr: soldr broker endpoint: ci=github_actions executable=/home/runner/.soldr/broker/soldr-broker logical=/home/runner/.soldr/broker/soldr-broker.sock bind=/home/runner/.soldr/broker/soldr-broker.sock log=/home/runner/.soldr/broker/broker-spawn.log
rustc: rustc 1.95.0 (59807616e 2026-04-14)
clang: Ubuntu clang version 18.1.3 (1ubuntu1)
sccache: sccache 0.18.0