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https://github.com/nodejs/node-v8/pull/147 broke the `vm.measureMemory()` API. It only created a `MeasureMemoryDelegate` and without actually calling `v8::Isolate::MeasureMemory()` so the returned promise will never resolve. This was not caught by the tests because the promise resolvers were not wrapped with `common.mustCall()`. This patch migrates the API properly and also introduce the newly added execution option to the API. It also removes support for specifying contexts to measure - instead we'll just return the measurements for all contexts in the detailed mode, which is what the `performance.measureMemory()` prototype in V8 currently does. We can consider implementing our own `v8::MeasureMemoryDelegate` to select the target context in `ShouldMeasure()` in the future, but then we'll also need to implement `MeasurementComplete()` to assemble the result. For now it's probably too early to do that. Since this API is still experimental (and guarded with a warning), such breakage should be acceptable. Refs: https://github.com/nodejs/node-v8/pull/147 PR-URL: https://github.com/nodejs/node/pull/32988 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
29 lines
803 B
JavaScript
29 lines
803 B
JavaScript
'use strict';
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const common = require('../common');
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const {
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assertDetailedShape,
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expectExperimentalWarning
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} = require('../common/measure-memory');
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const vm = require('vm');
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const assert = require('assert');
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expectExperimentalWarning();
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{
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const arr = [];
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const count = 10;
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for (let i = 0; i < count; ++i) {
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const context = vm.createContext({
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test: new Array(100).fill('foo')
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});
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arr.push(context);
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}
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// Check that one more context shows up in the result
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vm.measureMemory({ mode: 'detailed', execution: 'eager' })
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.then(common.mustCall((result) => {
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// We must hold on to the contexts here so that they
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// don't get GC'ed until the measurement is complete
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assert.strictEqual(arr.length, count);
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assertDetailedShape(result, count);
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}));
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}
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