clang 21.1.3 has problems with cuda-aware OpenMPI 5.0.8 (The call to cuMemHostRegister(0x7fb38c000000, 134217728, 0) failed.) appears for any code with nvptx offload target that uses cuda aware OpenMPI (message passing Interface), even if OpenMP is not used in code. #19618
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| # This file defines a workflow that runs the libc++ benchmarks when a comment is added to the PR. | |
| # | |
| # The comment is of the form: | |
| # | |
| # /libcxx-bot benchmark <path-to-benchmarks-to-run> | |
| # | |
| # That will cause the specified benchmarks to be run on the PR and on the pull-request target, and | |
| # their results to be compared. | |
| name: Benchmark libc++ | |
| permissions: | |
| contents: read | |
| on: | |
| issue_comment: | |
| types: | |
| - created | |
| - edited | |
| env: | |
| CC: clang-22 | |
| CXX: clang++-22 | |
| jobs: | |
| run-benchmarks: | |
| permissions: | |
| pull-requests: write | |
| if: >- | |
| github.event.issue.pull_request && | |
| contains(github.event.comment.body, '/libcxx-bot benchmark') | |
| runs-on: llvm-premerge-libcxx-next-runners # TODO: This should run on a dedicated set of machines | |
| steps: | |
| - uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c # v6.0.0 | |
| with: | |
| python-version: '3.13' | |
| - name: Extract information from the PR | |
| id: vars | |
| env: | |
| COMMENT_BODY: ${{ github.event.comment.body }} | |
| run: | | |
| python3 -m venv .venv | |
| source .venv/bin/activate | |
| python -m pip install pygithub | |
| cat <<EOF | python >> ${GITHUB_OUTPUT} | |
| import github | |
| repo = github.Github("${{ github.token }}").get_repo("${{ github.repository }}") | |
| pr = repo.get_pull(${{ github.event.issue.number }}) | |
| print(f"pr_base={pr.base.sha}") | |
| print(f"pr_head={pr.head.sha}") | |
| EOF | |
| BENCHMARKS=$(echo "$COMMENT_BODY" | sed -nE 's/\/libcxx-bot benchmark (.+)/\1/p') | |
| echo "benchmarks=${BENCHMARKS}" >> ${GITHUB_OUTPUT} | |
| - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0 | |
| with: | |
| ref: ${{ steps.vars.outputs.pr_head }} | |
| fetch-depth: 0 | |
| fetch-tags: true # This job requires access to all the Git branches so it can diff against (usually) main | |
| path: repo # Avoid nuking the workspace, where we have the Python virtualenv | |
| - name: Run baseline | |
| run: | | |
| source .venv/bin/activate && cd repo | |
| python -m pip install -r libcxx/utils/requirements.txt | |
| baseline_commit=$(git merge-base ${{ steps.vars.outputs.pr_base }} ${{ steps.vars.outputs.pr_head }}) | |
| ./libcxx/utils/test-at-commit --commit ${baseline_commit} -B build/baseline -- -sv -j1 --param optimization=speed ${{ steps.vars.outputs.benchmarks }} | |
| ./libcxx/utils/consolidate-benchmarks build/baseline | tee baseline.lnt | |
| - name: Run candidate | |
| run: | | |
| source .venv/bin/activate && cd repo | |
| ./libcxx/utils/test-at-commit --commit ${{ steps.vars.outputs.pr_head }} -B build/candidate -- -sv -j1 --param optimization=speed ${{ steps.vars.outputs.benchmarks }} | |
| ./libcxx/utils/consolidate-benchmarks build/candidate | tee candidate.lnt | |
| - name: Compare baseline and candidate runs | |
| run: | | |
| source .venv/bin/activate && cd repo | |
| ./libcxx/utils/compare-benchmarks baseline.lnt candidate.lnt | tee results.txt | |
| - name: Update comment with results | |
| run: | | |
| source .venv/bin/activate && cd repo | |
| cat <<EOF | python | |
| import github | |
| repo = github.Github("${{ github.token }}").get_repo("${{ github.repository }}") | |
| pr = repo.get_pull(${{ github.event.issue.number }}) | |
| comment = pr.get_issue_comment(${{ github.event.comment.id }}) | |
| with open('results.txt', 'r') as f: | |
| benchmark_results = f.read() | |
| new_comment_text = f""" | |
| {comment.body} | |
| <details> | |
| <summary> | |
| Benchmark results: | |
| </summary> | |
| \`\`\` | |
| {benchmark_results} | |
| \`\`\` | |
| </details> | |
| """ | |
| comment.edit(new_comment_text) | |
| EOF |