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src: improve compile cache performance and size #63861

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fb86fb9
src: improve compile cache performance and size
anonrig Jun 11, 2026
f427fb3
src: reuse zstd contexts in compile cache
anonrig Jun 11, 2026
a6273b1
src: embed zstd dictionary for further compile cache size wins
lemire Jun 12, 2026
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72 changes: 72 additions & 0 deletions benchmark/misc/compile-cache-timing.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,72 @@
'use strict';

// Startup benchmark for the compile cache (including the zstd dictionary).
// Compares no-cache / cold-cache / warm-cache for two workloads:
// big - one large module (the typescript.js fixture)
// many - many small modules (generated here, side-effect-free)
// The modules are generated into a temp dir so the benchmark is self-contained
// and reproducible, and never executes unrelated code.

const common = require('../common.js');
const { spawnSync } = require('child_process');
const fs = require('fs');
const os = require('os');
const path = require('path');

const bench = common.createBenchmark(main, {
workload: ['big', 'many'],
cache: ['none', 'cold', 'warm'],
n: [30],
});

const BIG = path.resolve(__dirname, '../../test/fixtures/snapshot/typescript.js');

// Generate `count` small, side-effect-free modules and return the require()
// code that loads them all in one child.
function makeManyModules(dir, count) {
fs.mkdirSync(dir, { recursive: true });
const reqs = [];
for (let i = 0; i < count; i++) {
const file = path.join(dir, `mod-${i}.js`);
fs.writeFileSync(
file,
`'use strict';\n` +
`module.exports = function value${i}(a, b) {\n` +
` const sum = a + b + ${i};\n` +
` return { id: ${i}, sum, label: 'module-${i}' };\n` +
`};\n`);
reqs.push(`require(${JSON.stringify(file)});`);
}
return reqs.join('');
}

function run(cmd, args, cacheDir) {
const env = { ...process.env };
if (cacheDir) env.NODE_COMPILE_CACHE = cacheDir;
else delete env.NODE_COMPILE_CACHE;
const child = spawnSync(cmd, args, { env, stdio: 'ignore' });
if (child.error) throw child.error;
}

function main({ n, workload, cache }) {
const cmd = process.execPath || process.argv[0];
const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'cc-bench-'));
const args = workload === 'big' ?
[BIG] :
['-e', makeManyModules(path.join(tmp, 'mods'), 120)];
const cacheDir = cache === 'none' ? null : path.join(tmp, 'cache');

try {
if (cache === 'warm') run(cmd, args, cacheDir); // populate once
bench.start();
for (let i = 0; i < n; i++) {
if (cache === 'cold' && cacheDir) {
fs.rmSync(cacheDir, { recursive: true, force: true });
}
run(cmd, args, cacheDir);
}
bench.end(n);
} finally {
fs.rmSync(tmp, { recursive: true, force: true });
}
}
17 changes: 17 additions & 0 deletions node.gyp
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Original file line number Diff line number Diff line change
Expand Up @@ -1110,6 +1110,22 @@
'<@(linked_module_files)',
],
},
{
'action_name': 'generate_compile_cache_zstd_dict',
'inputs': [
'src/compile_cache_zstd.dict',
'tools/generate_compile_cache_dict.py',
],
'outputs': [
'<(SHARED_INTERMEDIATE_DIR)/compile_cache_zstd_dict.h',
],
'action': [
'<(python)',
'tools/generate_compile_cache_dict.py',
'src/compile_cache_zstd.dict',
'<@(_outputs)',
],
},
],
}, # node_base
{
Expand All @@ -1123,6 +1139,7 @@
'src',
'deps/v8/include',
'deps/uv/include',
'<(SHARED_INTERMEDIATE_DIR)', # for compile_cache_zstd_dict.h etc.
],

'dependencies': [
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