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Use matrix strategy to measure size data on multiple platforms.
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‎.github/actions/report-code-size-changes/action.yml‎

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# Github composite action to report on code size changes across different
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# platforms.
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name: Report binary size changes on PR
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description: |
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Report on code size changes across different platforms resulting from a PR.
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The only input argument is the path to a directory containing a set of
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"*.json" files (extension required), each file containing the keys:
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- platform: the platform that the code size change was measured on
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- reference: the size in bytes of the reference binary (base of PR)
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- updated: the size in bytes of the updated binary (head of PR)
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The size is reported as a comment on the PR (accessed via context).
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inputs:
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data-directory:
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description: >
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Path to directory containing size data as a set of "*.json" files.
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required: true
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runs:
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using: composite
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steps:
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- name: Post a PR comment if the size has changed
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uses: actions/github-script@v6
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env:
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DATA_DIRECTORY: ${{ inputs.data-directory }}
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with:
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script: |
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const fs = require("fs");
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const size_dir = process.env.DATA_DIRECTORY;
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// Map the set of all the *.json files into an array of objects.
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const globber = await glob.create(`${size_dir}/*.json`);
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const files = await globber.glob();
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const sizes = files.map(path => {
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const contents = fs.readFileSync(path);
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return JSON.parse(contents);
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});
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// Map each object into some text, but only if it shows any difference
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// to report.
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const size_reports = sizes.flatMap(size_data => {
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const platform = size_data["platform"];
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const reference = size_data["reference"];
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const updated = size_data["updated"];
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if (!(reference > 0)) {
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core.setFailed(`Reference size invalid: ${reference}`);
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return;
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}
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if (!(updated > 0)) {
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core.setFailed(`Updated size invalid: ${updated}`);
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return;
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}
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const formatter = Intl.NumberFormat("en", {
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useGrouping: "always"
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});
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const updated_str = formatter.format(updated);
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const reference_str = formatter.format(reference);
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const diff = updated - reference;
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const diff_pct = (updated / reference) - 1;
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const diff_str = Intl.NumberFormat("en", {
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useGrouping: "always",
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sign: "exceptZero"
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}).format(diff);
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const diff_pct_str = Intl.NumberFormat("en", {
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style: "percent",
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useGrouping: "always",
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sign: "exceptZero",
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maximumFractionDigits: 2
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}).format(diff_pct);
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if (diff !== 0) {
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// The body is created here and wrapped so "weirdly" to avoid whitespace at the start of the lines,
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// which is interpreted as a code block by Markdown.
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const report = `On platform \`${platform}\`:
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- Original binary size: **${reference_str} B**
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- Updated binary size: **${updated_str} B**
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- Difference: **${diff_str} B** (${diff_pct_str})
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`;
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return [report];
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} else {
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return [];
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}
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});
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// If there are any size changes to report, format a comment and post
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// it.
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if (size_reports.length > 0) {
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const comment_sizes = size_reports.join("");
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const body = `Code size changes for a hello-world Rust program linked with libstd with backtrace:
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${comment_sizes}`;
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github.rest.issues.createComment({
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issue_number: context.issue.number,
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owner: context.repo.owner,
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repo: context.repo.repo,
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body
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});
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}
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‎.github/workflows/check-binary-size.yml‎

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branches:
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- master
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# Both the "measure" and "report" jobs need to know this.
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env:
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SIZE_DATA_DIR: sizes
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# Responsibility is divided between two jobs "measure" and "report", so that the
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# job that builds (and potentnially runs) untrusted code does not have PR write
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# permission, and vice-versa.
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jobs:
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measure:
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name: Check binary size
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runs-on: ubuntu-latest
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strategy:
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matrix:
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platform: [ubuntu-latest, windows-latest]
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runs-on: ${{ matrix.platform }}
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permissions:
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contents: read
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env:
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TEST_MAIN_RS: foo.rs
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BASE_COMMIT: ${{ github.event.pull_request.base.sha }}
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HEAD_COMMIT: ${{ github.event.pull_request.head.sha }}
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outputs:
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binary-size-reference: ${{ steps.size-reference.outputs.test-binary-size }}
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binary-size-updated: ${{ steps.size-updated.outputs.test-binary-size }}
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SIZE_DATA_FILE: size-${{ strategy.job-index }}.json
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steps:
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- name: Print info
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shell: bash
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echo "Base SHA: $BASE_COMMIT"
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# Note: the backtrace source that's cloned here is NOT the version to be
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# patched in to std. It's cloned here to access the Github action for
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# building the test binary and measuring its size.
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# building and measuring the test binary.
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- name: Clone backtrace to access Github action
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uses: actions/checkout@v3
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with:
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main-rs: ${{ env.TEST_MAIN_RS }}
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rustc-dir: ${{ env.RUSTC_DIR }}
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id: size-updated
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# There is no built-in way to "collect" all the outputs of a set of jobs
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# run with a matrix strategy. Subsequent jobs that have a "needs"
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# dependency on this one will be run once, when the last matrix job is
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# run. Appending data to a single file within a matrix is subject to race
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# conditions. So we write the size data to files with distinct names
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# generated from the job index.
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- name: Write sizes to file
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uses: actions/github-script@v6
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env:
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SIZE_REFERENCE: ${{ steps.size-reference.outputs.test-binary-size }}
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SIZE_UPDATED: ${{ steps.size-updated.outputs.test-binary-size }}
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PLATFORM: ${{ matrix.platform }}
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with:
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script: |
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const fs = require("fs");
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const path = require("path");
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fs.mkdirSync(process.env.SIZE_DATA_DIR, {recursive: true});
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const output_data = JSON.stringify({
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platform: process.env.PLATFORM,
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reference: process.env.SIZE_REFERENCE,
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updated: process.env.SIZE_UPDATED,
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});
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// The "wx" flag makes this fail if the file exists, which we want,
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// because there should be no collisions.
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fs.writeFileSync(
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path.join(process.env.SIZE_DATA_DIR, process.env.SIZE_DATA_FILE),
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output_data,
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{ flag: "wx" },
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);
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- name: Upload size data
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uses: actions/upload-artifact@v3
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with:
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name: size-files
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path: ${{ env.SIZE_DATA_DIR }}/${{ env.SIZE_DATA_FILE }}
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retention-days: 1
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if-no-files-found: error
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report:
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name: Report binary size changes
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runs-on: ubuntu-latest
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needs: measure
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permissions:
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pull-requests: write
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steps:
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- name: Post a PR comment if the size has changed
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uses: actions/github-script@v6
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env:
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SIZE_REFERENCE: ${{ needs.measure.outputs.binary-size-reference }}
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SIZE_UPDATED: ${{ needs.measure.outputs.binary-size-updated }}
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# Clone backtrace to access Github composite actions to report size.
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- uses: actions/checkout@v3
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- name: Download size data
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uses: actions/download-artifact@v3
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with:
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script: |
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const reference = process.env.SIZE_REFERENCE;
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const updated = process.env.SIZE_UPDATED;
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if (!(reference > 0)) {
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core.setFailed(`Reference size invalid: ${reference}`);
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return;
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}
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if (!(updated > 0)) {
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core.setFailed(`Updated size invalid: ${updated}`);
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return;
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}
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const formatter = Intl.NumberFormat("en", {useGrouping: "always"});
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const updated_str = formatter.format(updated);
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const reference_str = formatter.format(reference);
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const diff = updated - reference;
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const diff_pct = (updated / reference) - 1;
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const diff_str = Intl.NumberFormat("en", {
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useGrouping: "always",
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sign: "exceptZero"
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}).format(diff);
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const diff_pct_str = Intl.NumberFormat("en", {
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style: "percent",
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useGrouping: "always",
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sign: "exceptZero",
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maximumFractionDigits: 2
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}).format(diff_pct);
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if (diff !== 0) {
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// The body is created here and wrapped so "weirdly" to avoid whitespace at the start of the lines,
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// which is interpreted as a code block by Markdown.
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const body = `Below is the size of a hello-world Rust program linked with libstd with backtrace.
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Original binary size: **${reference_str} B**
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Updated binary size: **${updated_str} B**
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Difference: **${diff_str} B** (${diff_pct_str})`;
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github.rest.issues.createComment({
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issue_number: context.issue.number,
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owner: context.repo.owner,
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repo: context.repo.repo,
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body
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})
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}
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name: size-files
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path: ${{ env.SIZE_DATA_DIR }}
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- uses: ./.github/actions/report-code-size-changes
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with:
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data-directory: ${{ env.SIZE_DATA_DIR }}

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