nodejs
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‎test/fixtures/linux-perf.js‎
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+26Lines changed: 26 additions & 0 deletions b/Collapse file
‎test/fixtures/linux-perf.js‎
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+26Lines changed: 26 additions & 0 deletions
diff --git a/Collapse file
‎test/v8-updates/test-linux-perf.js‎
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‎test/v8-updates/test-linux-perf.js‎
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+81Lines changed: 81 additions & 0 deletions
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+'use strict';
+
+const crypto = require('crypto');
+
+// Functions should be complex enough for V8 to run them a few times before
+// compiling, but not complex enough to always stay in interpreted mode. They
+// should also take some time to run, otherwise Linux perf might miss them
+// entirely even when sampling at a high frequency.
+function functionOne(i) {
+  for (let j=i; j > 0; j--) {
+    crypto.createHash('md5').update(functionTwo(i, j)).digest("hex");
+  }
+}
+
+function functionTwo(x, y) {
+  let data = ((((x * y) + (x / y)) * y) ** (x + 1)).toString();
+  if (x % 2 == 0) {
+    return crypto.createHash('md5').update(data.repeat((x % 100) + 1)).digest("hex");
+  } else {
+    return crypto.createHash('md5').update(data.repeat((y % 100) + 1)).digest("hex");
+  }
+}
+
+for (let i = 0; i < 1000; i++) {
+  functionOne(i);
+}
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+'use strict';
+
+// This test verifies that JavaScript functions are being correctly sampled by
+// Linux perf. The test runs a JavaScript script, sampling the execution with
+// Linux perf. It then uses `perf script` to generate a human-readable output,
+// and uses regular expressions to find samples of the functions defined in
+// `fixtures/linux-perf.js`.
+
+// NOTE (mmarchini): this test is meant to run only on Linux machines with Linux
+// perf installed. It will skip if those criteria are not met.
+
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+
+const assert = require('assert');
+const { spawnSync } = require('child_process');
+const fixtures = require('../common/fixtures');
+const tmpdir = require('../common/tmpdir');
+tmpdir.refresh();
+
+if (process.config.variables.node_shared)
+  common.skip("can't test Linux perf with shared libraries yet");
+
+const perfArgs = [
+  'record',
+  '-F500',
+  '-g',
+  '--',
+  process.execPath,
+  '--perf-basic-prof',
+  '--interpreted-frames-native-stack',
+  '--no-turbo-inlining',  // Otherwise simple functions might get inlined.
+  fixtures.path('linux-perf.js'),
+];
+
+const perfScriptArgs = [
+  'script',
+];
+
+const options = {
+  cwd: tmpdir.path,
+  encoding: 'utf-8',
+};
+
+if (!common.isLinux)
+  common.skip('only testing Linux for now');
+
+const perf = spawnSync('perf', perfArgs, options);
+
+if (perf.error && perf.error.errno === 'ENOENT')
+  common.skip('perf not found on system');
+
+if (perf.status !== 0) {
+  common.skip(`Failed to execute perf: ${perf.stderr}`);
+}
+
+const perfScript = spawnSync('perf', perfScriptArgs, options);
+
+if (perf.error)
+  common.skip(`perf script aborted: ${perf.error.errno}`);
+
+if (perfScript.status !== 0) {
+  common.skip(`Failed to execute perf script: ${perfScript.stderr}`);
+}
+
+const interpretedFunctionOneRe = /InterpretedFunction:functionOne/;
+const compiledFunctionOneRe = /LazyCompile:\*functionOne/;
+const interpretedFunctionTwoRe = /InterpretedFunction:functionTwo/;
+const compiledFunctionTwoRe = /LazyCompile:\*functionTwo/;
+
+const output = perfScript.stdout;
+
+assert.ok(output.match(interpretedFunctionOneRe),
+          "Couldn't find interpreted functionOne()");
+assert.ok(output.match(compiledFunctionOneRe),
+          "Couldn't find compiled functionOne()");
+assert.ok(output.match(interpretedFunctionTwoRe),
+          "Couldn't find interpreted functionTwo()");
+assert.ok(output.match(compiledFunctionTwoRe),
+          "Couldn't find compiled functionTwo");