26 lines
959 B
JavaScript
26 lines
959 B
JavaScript
(function(global) {
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let counter = 0;
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// Spins up a new profiler and performs some work in a new top-level task,
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// calling some builtins. Returns a promise for the resulting trace.
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const profileBuiltinsInNewTask = () => {
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// Run profiling logic in a new task to eliminate the caller stack.
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return new Promise(resolve => {
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setTimeout(async () => {
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const profiler = new Profiler({ sampleInterval: 10, maxBufferSize: 10000 });
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for (const deadline = performance.now() + 500; performance.now() < deadline;) {
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// Run a range of builtins to ensure they get included in the trace.
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// Store this computation in a variable to prevent getting optimized out.
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counter += Math.random();
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counter += performance.now();
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}
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const trace = await profiler.stop();
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resolve(trace);
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});
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});
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}
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global.ProfilingScript = {
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profileBuiltinsInNewTask,
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}
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})(window);
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