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https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Rubén Norte
b903ed7940
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/52827 Changelog: [internal] This adds **support for creating Hermes/JS sampling profiler traces in Fantom**, which is especially useful when running benchmarks. Usage: ``` FANTOM_PROFILE_JS=1 yarn fantom Animated-benchmark ``` Output: {F1980642216} After this, the trace is fully symbolicated. Can be opened directly in Google Chrome: {F1980642229} Or in the built-in viewer in VSCode: {F1980642242} {F1980642240} {F1980642241} When collapsing frames in the Flame Chart viewer in VSCode, we can quickly identify opportunities for optimizations. This also supports multi-config environments. In that case, trace file names are created using a short representation of the configuration. User guide for benchmarks in Fantom, including how to use this, will be done in a future diff. NOTE: This still doesn't work in OSS because we don't support optimized mode there. In dev mode, there's a segmentation fault coming from this line: `hermesRuntime->sampledTraceToStreamInDevToolsFormat(fileStream)` Reviewed By: sammy-SC Differential Revision: D78905646 fbshipit-source-id: 382ddd5034db601309bd118cedde2fe0d57fde98
34 lines
932 B
JavaScript
34 lines
932 B
JavaScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict-local
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* @format
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*/
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import path from 'path';
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export const OUTPUT_PATH: string = path.resolve(__dirname, '..', '.out');
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export const JS_BUILD_OUTPUT_PATH: string = path.join(OUTPUT_PATH, 'js-builds');
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export const NATIVE_BUILD_OUTPUT_PATH: string = path.join(
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OUTPUT_PATH,
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'native-builds',
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);
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export const JS_TRACES_OUTPUT_PATH: string = path.join(
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OUTPUT_PATH,
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'js-traces',
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);
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export function getTestBuildOutputPath(): string {
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const fantomRunID = process.env.__FANTOM_RUN_ID__;
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if (fantomRunID == null) {
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throw new Error(
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'Expected Fantom run ID to be set by global setup, but it was not (process.env.__FANTOM_RUN_ID__ is null)',
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);
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}
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return path.join(JS_BUILD_OUTPUT_PATH, fantomRunID);
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}
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