Hi Quingsi,

This report is a false positive. We will investigate why noise levels have increased in our benchmarking setup.

Regards,

-- Maxim Kuvyrkov https://www.linaro.org

On 13 Oct 2021, at 04:43, ci_notify@linaro.org wrote:

After llvm commit 75127bce6de78b83b70b898a04473f213451f13e Author: Qiongsi Wu qwu@ibm.com

[AIX][ZOS] Excluding merge-objc-interface.m from Tests

the following hot functions slowed down by more than 10% (but their benchmarks slowed down by less than 2%):

• 433.milc:[.] mult_su3_mat_vec slowed down by 16% from 1615 to 1871 perf samples

Below reproducer instructions can be used to re-build both "first_bad" and "last_good" cross-toolchains used in this bisection. Naturally, the scripts will fail when triggerring benchmarking jobs if you don't have access to Linaro TCWG CI.

For your convenience, we have uploaded tarballs with pre-processed source and assembly files at:

• First_bad save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-a...
• Last_good save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-a...
• Baseline save-temps: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-a...

Configuration:

• Benchmark: SPEC CPU2006
• Toolchain: Clang + Glibc + LLVM Linker
• Version: all components were built from their tip of trunk
• Target: aarch64-linux-gnu
• Compiler flags: -O3
• Hardware: NVidia TX1 4x Cortex-A57

This benchmarking CI is work-in-progress, and we welcome feedback and suggestions at linaro-toolchain@lists.linaro.org . In our improvement plans is to add support for SPEC CPU2017 benchmarks and provide "perf report/annotate" data behind these reports.

THIS IS THE END OF INTERESTING STUFF. BELOW ARE LINKS TO BUILDS, REPRODUCTION INSTRUCTIONS, AND THE RAW COMMIT.

This commit has regressed these CI configurations:

• tcwg_bmk_llvm_tx1/llvm-master-aarch64-spec2k6-O3

First_bad build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-a... Last_good build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-a... Baseline build: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-a... Even more details: https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-a...

Reproduce builds:

<cut> mkdir investigate-llvm-75127bce6de78b83b70b898a04473f213451f13e cd investigate-llvm-75127bce6de78b83b70b898a04473f213451f13e

# Fetch scripts git clone https://git.linaro.org/toolchain/jenkins-scripts

# Fetch manifests and test.sh script mkdir -p artifacts/manifests curl -o artifacts/manifests/build-baseline.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-a... --fail curl -o artifacts/manifests/build-parameters.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-a... --fail curl -o artifacts/test.sh https://ci.linaro.org/job/tcwg_bmk_ci_llvm-bisect-tcwg_bmk_tx1-llvm-master-a... --fail chmod +x artifacts/test.sh

# Reproduce the baseline build (build all pre-requisites) ./jenkins-scripts/tcwg_bmk-build.sh @@ artifacts/manifests/build-baseline.sh

# Save baseline build state (which is then restored in artifacts/test.sh) mkdir -p ./bisect rsync -a --del --delete-excluded --exclude /bisect/ --exclude /artifacts/ --exclude /llvm/ ./ ./bisect/baseline/

cd llvm

# Reproduce first_bad build git checkout --detach 75127bce6de78b83b70b898a04473f213451f13e ../artifacts/test.sh

# Reproduce last_good build git checkout --detach d01ae990e1fd6561ed86dc8004a7147dd09fb13c ../artifacts/test.sh

cd ..

</cut>

Full commit (up to 1000 lines):

<cut> commit 75127bce6de78b83b70b898a04473f213451f13e Author: Qiongsi Wu <qwu@ibm.com> Date: Fri Oct 8 13:58:32 2021 +0000

[AIX][ZOS] Excluding merge-objc-interface.m from Tests

Objective C is not supported on AIX or ZOS. This patch excludes the newly added `clang/test/Modules/merge-objc-interface.m` (added by https://reviews.llvm.org/D110280) from AIX and ZOS testing.

Many existing tests are already disabled by https://reviews.llvm.org/D109060.

Reviewed By: jsji

Differential Revision: https://reviews.llvm.org/D111406

clang/test/Modules/merge-objc-interface.m | 1 + 1 file changed, 1 insertion(+)

diff --git a/clang/test/Modules/merge-objc-interface.m b/clang/test/Modules/merge-objc-interface.m index fba06294a26a..f62f541c1a29 100644 --- a/clang/test/Modules/merge-objc-interface.m +++ b/clang/test/Modules/merge-objc-interface.m @@ -1,3 +1,4 @@ +// UNSUPPORTED: -zos, -aix // RUN: rm -rf %t // RUN: split-file %s %t // RUN: %clang_cc1 -emit-llvm -o %t/test.bc -F%t/Frameworks %t/test.m \

</cut>