zccache benchmark stats

Generated 2026-10-27T15:38:15+00:00 | ref main | sha 960a011b13a5 | 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	2.460s	4.388s	2.793s	0 B	576 KiB	127 KiB	1.6x faster	1.1x slower
Single-file, Warm	2.491s	171.271ms	23.141ms	0 B	576 KiB	212 KiB	7.4x faster	107.6x faster
C static-library link
Static archive, Cold	58.594ms	62.328ms	65.679ms	0 B	0 B	185 KiB	n/a	1.1x slower
Static archive, Warm	60.611ms	59.938ms	0.432ms	0 B	0 B	190 KiB	n/a	140.1x faster
C++ inline args
Single-file, Cold	10.141s	13.481s	10.531s	0 B	907 KiB	844 KiB	1.3x faster	1.0x slower
Single-file, Warm	10.109s	218.023ms	30.21ms	0 B	907 KiB	930 KiB	7.2x faster	334.6x faster
Multi-file, Cold (per-TU)	10.141s	13.249s	10.423s	0 B	907 KiB	231 KiB	1.3x faster	1.0x slower
Multi-file, Warm	10.016s	10.071s	32.579ms	0 B	0 B	236 KiB	n/a	307.4x faster
C++ response files
Single-file RSP, Cold	10.188s	13.807s	10.735s	0 B	919 KiB	1.2 MiB	1.3x faster	1.1x slower
Single-file RSP, Warm	10.158s	249.892ms	56.664ms	0 B	919 KiB	1.3 MiB	4.4x faster	179.3x faster
Multi-file RSP, Cold (per-TU)	10.118s	13.715s	10.965s	0 B	919 KiB	225 KiB	1.3x faster	1.1x slower
Multi-file RSP, Warm	10.181s	10.106s	31.975ms	0 B	0 B	226 KiB	n/a	318.4x faster
Emscripten em++
Single-file, Cold	8.337s	14.357s	8.845s	0 B	1.8 MiB	84 KiB	1.6x faster	1.1x slower
Single-file, Warm	8.196s	250.311ms	56.187ms	0 B	1.8 MiB	175 KiB	4.5x faster	145.9x faster
Multi-file, Cold (per-TU)	8.265s	14.100s	4.859s	0 B	1.8 MiB	215 KiB	2.9x faster	1.7x faster
Multi-file, Warm	4.378s	4.240s	35.046ms	0 B	0 B	221 KiB	n/a	124.9x faster
C++ driver link
Driver link, Cold	71.059ms	140.903ms	73.042ms	0 B	0 B	977 B	n/a	1.0x slower
Driver link, Warm	72.393ms	74.189ms	0.399ms	0 B	0 B	48 KiB	n/a	181.5x faster
Emscripten link
HTML link, Cold	425.78ms	809.607ms	417.753ms	0 B	0 B	72 KiB	n/a	1.0x faster
HTML link, Warm	412.761ms	423.533ms	0.456ms	0 B	0 B	77 KiB	n/a	904.9x faster
Wasm link, Cold	177.584ms	558.475ms	183.058ms	0 B	0 B	1012 B	n/a	1.0x slower
Wasm link, Warm	178.267ms	179.797ms	0.348ms	0 B	0 B	6.5 KiB	n/a	512.0x faster
Rust workspace link
Workspace staticlib link, Cold	39.866ms	145.713ms	59.695ms	0 B	0 B	40.4 MiB	2.4x faster	1.5x slower
Workspace staticlib link, Warm	41.181ms	43.878ms	10.073ms	0 B	0 B	23.3 MiB	n/a	4.1x faster
Rust rustc
Build, Cold	1.791s	2.962s	1.998s	0 B	1.0 MiB	2.9 MiB	1.5x faster	1.1x slower
Build, Warm	1.770s	954.928ms	38.194ms	0 B	1.0 MiB	3.0 MiB	25.0x faster	46.3x faster
Check, Cold	920.691ms	2.057s	1.154s	0 B	94 KiB	378 KiB	1.8x faster	1.3x slower
Check, Warm	917.512ms	921.169ms	27.953ms	0 B	94 KiB	515 KiB	33.0x faster	32.8x faster
C++ sibling git remap
Sibling-workspace no __FILE__, Warm	10.111s	218.197ms	43.048ms	0 B	1.7 MiB	1.2 MiB	5.1x faster	234.9x faster
Sibling-workspace with __FILE__, Warm	10.106s	13.256s	41.007ms	0 B	1.8 MiB	1.3 MiB	n/a	246.4x faster
Emscripten sibling git remap
Sibling-workspace, Warm	8.183s	252.916ms	68.125ms	0 B	1.8 MiB	578 KiB	3.7x faster	120.1x faster
Rust sibling git remap
Sibling-workspace, Warm	1.821s	953.709ms	36.356ms	0 B	1.0 MiB	3.4 MiB	26.2x faster	50.1x faster

Environment

Runner: Linux-7.0.0-1017-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 0.19.0