[libcxx-commits] [libcxx] [libc++] Allow passing individual commits to LNT runners (PR #189020)
Louis Dionne via libcxx-commits
libcxx-commits at lists.llvm.org
Fri Mar 27 08:11:46 PDT 2026
https://github.com/ldionne created https://github.com/llvm/llvm-project/pull/189020
This is useful for generating specific data points.
>From cf2b972d56491746af1baa5f00651ec7955a7ef4 Mon Sep 17 00:00:00 2001
From: Louis Dionne <ldionne.2 at gmail.com>
Date: Fri, 27 Mar 2026 11:08:29 -0400
Subject: [PATCH] [libc++] Allow passing individual commits to LNT runners
This is useful for generating specific data points.
---
libcxx/utils/ci/lnt/runners/README.md | 5 +-
libcxx/utils/ci/lnt/runners/apple-m5-clang21 | 49 +++++++++++++-------
libcxx/utils/ci/lnt/runners/apple-m5-xcode26 | 47 ++++++++++++-------
3 files changed, 68 insertions(+), 33 deletions(-)
diff --git a/libcxx/utils/ci/lnt/runners/README.md b/libcxx/utils/ci/lnt/runners/README.md
index 13668947b27ea..08bbc9d7913b1 100644
--- a/libcxx/utils/ci/lnt/runners/README.md
+++ b/libcxx/utils/ci/lnt/runners/README.md
@@ -3,5 +3,8 @@
This directory defines some LNT runners for tracking libc++ performance. A runner can be run with
```
-bash <(curl -Ls https://raw.githubusercontent.com/llvm/llvm-project/main/libcxx/utils/ci/lnt/runners/RUNNER) <ARGS...>
+bash <(curl -Ls https://raw.githubusercontent.com/llvm/llvm-project/main/libcxx/utils/ci/lnt/runners/RUNNER) <path-to-llvm-monorepo> [-- commit ...]
```
+
+By default, runners poll `lnt.llvm.org` to discover un-benchmarked commits. If commits are provided
+after `--`, only those commits are benchmarked and the runner exits.
diff --git a/libcxx/utils/ci/lnt/runners/apple-m5-clang21 b/libcxx/utils/ci/lnt/runners/apple-m5-clang21
index a901bffda6d97..9b5bc44f720a2 100755
--- a/libcxx/utils/ci/lnt/runners/apple-m5-clang21
+++ b/libcxx/utils/ci/lnt/runners/apple-m5-clang21
@@ -5,27 +5,44 @@
#
if [ -z "${1}" ] || [ ! -d "${1}" ]; then
- echo "usage: ${0} <path-to-llvm-monorepo>"
+ echo "usage: ${0} <path-to-llvm-monorepo> [-- commit ...]"
echo "error: Please provide a valid path to the LLVM monorepo."
exit 1
fi
MONOREPO_DIR=$(cd "${1}" && pwd)
+shift
+if [ "${1}" = "--" ]; then
+ shift
+fi
+COMMITS=("$@")
export SDKROOT=$(xcrun --show-sdk-path)
-while true; do
- ${MONOREPO_DIR}/libcxx/utils/ci/lnt/commit-watch --git-repo ${MONOREPO_DIR} \
- --lnt-url http://lnt.llvm.org --test-suite libcxx2 --machine apple-m5-clang21 | \
- while read commit; do \
- ${MONOREPO_DIR}/libcxx/utils/ci/lnt/run-benchmarks \
- --test-suite-commit 0eefb2682bf8c04954c46e91916b5164d8424702 \
- --git-repo ${MONOREPO_DIR} \
- --lnt-url http://lnt.llvm.org \
- --test-suite libcxx2 \
- --machine apple-m5-clang21 \
- --compiler $(brew --prefix)/opt/llvm/bin/clang++ \
- --benchmark-commit ${commit}; \
- done
- sleep 60 # To avoid busy looping in case something goes really wrong
-done
+COMPILER=$(brew --prefix)/opt/llvm/bin/clang++
+
+run_benchmarks() {
+ ${MONOREPO_DIR}/libcxx/utils/ci/lnt/run-benchmarks \
+ --test-suite-commit 0eefb2682bf8c04954c46e91916b5164d8424702 \
+ --git-repo ${MONOREPO_DIR} \
+ --lnt-url http://lnt.llvm.org \
+ --test-suite libcxx2 \
+ --machine apple-m5-clang21 \
+ --compiler ${COMPILER} \
+ --benchmark-commit ${1}
+}
+
+if [ ${#COMMITS[@]} -gt 0 ]; then
+ for commit in "${COMMITS[@]}"; do
+ run_benchmarks ${commit}
+ done
+else
+ while true; do
+ ${MONOREPO_DIR}/libcxx/utils/ci/lnt/commit-watch --git-repo ${MONOREPO_DIR} \
+ --lnt-url http://lnt.llvm.org --test-suite libcxx2 --machine apple-m5-clang21 | \
+ while read commit; do \
+ run_benchmarks ${commit}
+ done
+ sleep 60 # To avoid busy looping in case something goes really wrong
+ done
+fi
diff --git a/libcxx/utils/ci/lnt/runners/apple-m5-xcode26 b/libcxx/utils/ci/lnt/runners/apple-m5-xcode26
index 98c664e0c9b43..6120b71e5595a 100755
--- a/libcxx/utils/ci/lnt/runners/apple-m5-xcode26
+++ b/libcxx/utils/ci/lnt/runners/apple-m5-xcode26
@@ -5,25 +5,40 @@
#
if [ -z "${1}" ] || [ ! -d "${1}" ]; then
- echo "usage: ${0} <path-to-llvm-monorepo>"
+ echo "usage: ${0} <path-to-llvm-monorepo> [-- commit ...]"
echo "error: Please provide a valid path to the LLVM monorepo."
exit 1
fi
MONOREPO_DIR=$(cd "${1}" && pwd)
+shift
+if [ "${1}" = "--" ]; then
+ shift
+fi
+COMMITS=("$@")
+
+run_benchmarks() {
+ ${MONOREPO_DIR}/libcxx/utils/ci/lnt/run-benchmarks \
+ --test-suite-commit 0eefb2682bf8c04954c46e91916b5164d8424702 \
+ --git-repo ${MONOREPO_DIR} \
+ --lnt-url http://lnt.llvm.org \
+ --test-suite libcxx2 \
+ --machine apple-m5-xcode26 \
+ --compiler clang++ \
+ --benchmark-commit ${1}
+}
-while true; do
- ${MONOREPO_DIR}/libcxx/utils/ci/lnt/commit-watch --git-repo ${MONOREPO_DIR} \
- --lnt-url http://lnt.llvm.org --test-suite libcxx2 --machine apple-m5-xcode26 | \
- while read commit; do \
- ${MONOREPO_DIR}/libcxx/utils/ci/lnt/run-benchmarks \
- --test-suite-commit 0eefb2682bf8c04954c46e91916b5164d8424702 \
- --git-repo ${MONOREPO_DIR} \
- --lnt-url http://lnt.llvm.org \
- --test-suite libcxx2 \
- --machine apple-m5-xcode26 \
- --compiler clang++ \
- --benchmark-commit ${commit}; \
- done
- sleep 60 # To avoid busy looping in case something goes really wrong
-done
+if [ ${#COMMITS[@]} -gt 0 ]; then
+ for commit in "${COMMITS[@]}"; do
+ run_benchmarks ${commit}
+ done
+else
+ while true; do
+ ${MONOREPO_DIR}/libcxx/utils/ci/lnt/commit-watch --git-repo ${MONOREPO_DIR} \
+ --lnt-url http://lnt.llvm.org --test-suite libcxx2 --machine apple-m5-xcode26 | \
+ while read commit; do \
+ run_benchmarks ${commit}
+ done
+ sleep 60 # To avoid busy looping in case something goes really wrong
+ done
+fi
More information about the libcxx-commits
mailing list