benchmark: add vm.SourceTextModule benchmark

joyeecheung · aduh95 · commit 1bbcdf9039d3 · 2025-10-24T00:49:34.000+02:00
PR-URL: #59396 Refs: https://chromium-review.googlesource.com/c/v8/v8/+/6804466 Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
diff --git a/benchmark/esm/import-esm-reload.js b/benchmark/esm/import-esm-reload.js
@@ -0,0 +1,37 @@
+'use strict';
+
+const common = require('../common');
+const fs = require('fs');
+const tmpdir = require('../../test/common/tmpdir');
+const assert = require('assert');
+const { pathToFileURL } = require('url');
+const bench = common.createBenchmark(main, {
+ count: [1, 100],
+ n: [1000],
+});
+
+function prepare(count) {
+ tmpdir.refresh();
+ const dir = tmpdir.resolve('modules');
+ fs.mkdirSync(dir, { recursive: true });
+ let modSource = '';
+ for (let i = 0; i < count; ++i) {
+ modSource += `export const value${i} = 1;\n`;
+ }
+ const script = tmpdir.resolve('mod.js');
+ fs.writeFileSync(script, modSource, 'utf8');
+ return script;
+}
+
+async function main({ n, count }) {
+ const script = prepare(count);
+ const url = pathToFileURL(script).href;
+ let result = 0;
+ bench.start();
+ for (let i = 0; i < n; i++) {
+ const mod = await import(`${url}?t=${i}`);
+ result += mod[`value${count - 1}`];
+ }
+ bench.end(n);
+ assert.strictEqual(result, n);
+}
diff --git a/benchmark/vm/source-text-module-chained.js b/benchmark/vm/source-text-module-chained.js
@@ -0,0 +1,48 @@
+'use strict';
+
+const vm = require('vm');
+const common = require('../common.js');
+const assert = require('assert');
+
+const bench = common.createBenchmark(main, {
+ stage: ['all', 'instantiate', 'evaluate'],
+ n: [1000],
+}, {
+ flags: ['--experimental-vm-modules'],
+});
+
+function main({ stage, n }) {
+ const arr = [new vm.SourceTextModule(`
+ export const value = 42;
+ `)];
+
+ if (stage === 'all') {
+ bench.start();
+ }
+
+ for (let i = 0; i < n; i++) {
+ const m = new vm.SourceTextModule(`
+ export { value } from 'mod${i}';
+ `);
+ arr.push(m);
+ m.linkRequests([arr[i]]);
+ }
+
+ if (stage === 'instantiate') {
+ bench.start();
+ }
+ arr[n].instantiate();
+ if (stage === 'instantiate') {
+ bench.end(n);
+ }
+
+ if (stage === 'evaluate') {
+ bench.start();
+ }
+ arr[n].evaluate();
+ if (stage === 'evaluate' || stage === 'all') {
+ bench.end(n);
+ }
+
+ assert.strictEqual(arr[n].namespace.value, 42);
+}
diff --git a/benchmark/vm/source-text-module-flat.js b/benchmark/vm/source-text-module-flat.js
@@ -0,0 +1,68 @@
+'use strict';
+
+const vm = require('vm');
+const common = require('../common.js');
+const assert = require('assert');
+
+const bench = common.createBenchmark(main, {
+ stage: ['all', 'link', 'instantiate', 'evaluate'],
+ n: [1000],
+}, {
+ flags: ['--experimental-vm-modules'],
+});
+
+function main({ stage, n }) {
+ const arr = [];
+ let importSource = '';
+ let useSource = 'export const result = 0 ';
+ for (let i = 0; i < n; i++) {
+ importSource += `import { value${i} } from 'mod${i}';\n`;
+ useSource += ` + value${i}\n`;
+ }
+
+ if (stage === 'all') {
+ bench.start();
+ }
+ for (let i = 0; i < n; i++) {
+ const m = new vm.SourceTextModule(`
+ export const value${i} = 1;
+ `);
+ arr.push(m);
+ }
+
+ const root = new vm.SourceTextModule(`
+ ${importSource}
+ ${useSource};
+ `);
+
+ if (stage === 'link') {
+ bench.start();
+ }
+
+ root.linkRequests(arr);
+ for (let i = 0; i < n; i++) {
+ arr[i].linkRequests([]);
+ }
+
+ if (stage === 'link') {
+ bench.end(n);
+ }
+
+ if (stage === 'instantiate') {
+ bench.start();
+ }
+ root.instantiate();
+ if (stage === 'instantiate') {
+ bench.end(n);
+ }
+
+ if (stage === 'evaluate') {
+ bench.start();
+ }
+ root.evaluate();
+ if (stage === 'evaluate' || stage === 'all') {
+ bench.end(n);
+ }
+
+ assert.strictEqual(root.namespace.result, n);
+}

-Original file line number
+Diff line change
@@ @@ -0,0 +1,37 @@ @@
 +'use strict';
++
 +constcommon=require('../common');
 +constfs=require('fs');
 +consttmpdir=require('../../test/common/tmpdir');
 +constassert=require('assert');
 +const{ pathToFileURL }=require('url');
 +constbench=common.createBenchmark(main,{
 +count: [1,100],
 +n: [1000],
 +});
++
 +functionprepare(count){
 +tmpdir.refresh();
 +constdir=tmpdir.resolve('modules');
 +fs.mkdirSync(dir,{recursive: true});
 +letmodSource='';
 +for(leti=0;i<count;++i){
 +modSource+=`export const value${i} = 1;\n`;
 +}
 +constscript=tmpdir.resolve('mod.js');
 +fs.writeFileSync(script,modSource,'utf8');
 +returnscript;
 +}
++
 +asyncfunctionmain({ n, count }){
 +constscript=prepare(count);
 +consturl=pathToFileURL(script).href;
 +letresult=0;
 +bench.start();
 +for(leti=0;i<n;i++){
 +constmod=awaitimport(`${url}?t=${i}`);
 +result+=mod[`value${count-1}`];
 +}
 +bench.end(n);
 +assert.strictEqual(result,n);
 +}