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add patches to hwloc v2.12.1 to better handle ACPI CPCC, fixes performance regression in MPI startup time (MPI_Init)#25043

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Thyre:20260113105823_new_pr_hwloc2121
Jan 13, 2026
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add patches to hwloc v2.12.1 to better handle ACPI CPCC, fixes performance regression in MPI startup time (MPI_Init)#25043
Micket merged 2 commits intoeasybuilders:developfrom
Thyre:20260113105823_new_pr_hwloc2121

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@Thyre Thyre commented Jan 13, 2026 •
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(created using eb --new-pr)

See also open-mpi/hwloc#756.
Marked as draft to first test on our Zen 2 systems.

@Thyre Thyre marked this pull request as draft January 13, 2026 09:58
@github-actions github-actions Bot added 2025b issues & PRs related to 2025b common toolchains change labels Jan 13, 2026
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Thyre commented Jan 13, 2026

Test report by @Thyre
SUCCESS
Build succeeded for 1 out of 1 (total: 1 min 3 secs) (1 easyconfigs in total)
jrlogin10.jureca - Linux Rocky Linux 9.6, x86_64, AMD EPYC 7742 64-Core Processor (zen2), 2 x NVIDIA Quadro RTX 8000, 580.95.05, Python 3.9.21
See https://gist.github.com/Thyre/8fdfdb5f99d55fafddb23dd56902561a for a full test report.

@Thyre Thyre marked this pull request as ready for review January 13, 2026 10:04
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Thyre commented Jan 13, 2026

@boegelbot please test @ jsc-zen3
EB_ARGS="--installpath /tmp/$USER/ecpr-25043"

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Thyre commented Jan 13, 2026

Test report by @Thyre
SUCCESS
Build succeeded for 1 out of 1 (total: 1 min 33 secs) (1 easyconfigs in total)
ZAM054 - Linux Zorin OS 18, x86_64, 12th Gen Intel(R) Core(TM) i7-1260P (skylake), 1 x NVIDIA NVIDIA GeForce MX550, 580.95.05, Python 3.12.3
See https://gist.github.com/Thyre/7989028ea48c082bac031c02a40d9efb for a full test report.

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Thyre commented Jan 13, 2026

Test report by @Thyre
SUCCESS
Build succeeded for 1 out of 1 (total: 58 secs) (1 easyconfigs in total)
jwlogin21.juwels - Linux Rocky Linux 9.6, x86_64, AMD EPYC 7402 24-Core Processor (zen2), Python 3.9.21
See https://gist.github.com/Thyre/7d6b210fd8546d872cdcad470bf565a5 for a full test report.

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boegelbot commented Jan 13, 2026

@Thyre: Request for testing this PR well received on jsczen3l1.int.jsc-zen3.fz-juelich.de

PR test command 'if [[ develop != 'develop' ]]; then EB_BRANCH=develop ./easybuild_develop.sh 2> /dev/null 1>&2; EB_PREFIX=/home/boegelbot/easybuild/develop source init_env_easybuild_develop.sh; fi; EB_PR=25043 EB_ARGS="--installpath /tmp/$USER/ecpr-25043" EB_CONTAINER= EB_REPO=easybuild-easyconfigs EB_BRANCH=develop /opt/software/slurm/bin/sbatch --job-name test_PR_25043 --ntasks=8 ~/boegelbot/eb_from_pr_upload_jsc-zen3.sh' executed!

  • exit code: 0
  • output:
Submitted batch job 9377

Test results coming soon (I hope)...

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Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

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Thyre commented Jan 13, 2026

Test report by @Thyre
SUCCESS
Build succeeded for 1 out of 1 (total: 19 secs) (1 easyconfigs in total)
jpbl-s01-01 - Linux RHEL 9.6, AArch64, ARM UNKNOWN (neoverse_v2), 1 x NVIDIA NVIDIA GH200 480GB, 570.133.20, Python 3.9.21
See https://gist.github.com/Thyre/8f8187dafcd745a731e983e01849c4ed for a full test report.

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boegelbot commented Jan 13, 2026

Test report by @boegelbot
SUCCESS
Build succeeded for 1 out of 1 (total: 1 min 22 secs) (1 easyconfigs in total)
jsczen3c1.int.jsc-zen3.fz-juelich.de - Linux Rocky Linux 9.7, x86_64, AMD EPYC-Milan Processor (zen3), Python 3.9.23
See https://gist.github.com/boegelbot/9ce89bb2411ad87a0d7a592425348208 for a full test report.

@Thyre Thyre added bug fix and removed change labels Jan 13, 2026
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Micket approved these changes Jan 13, 2026
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lgtm

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Micket commented Jan 13, 2026

Test report by @Micket
SUCCESS
Build succeeded for 1 out of 1 (total: 1 min 3 secs) (1 easyconfigs in total)
vera-icelake-build - Linux Rocky Linux 9.6, x86_64, Intel(R) Xeon(R) Silver 4316 CPU @ 2.30GHz, Python 3.9.21
See https://gist.github.com/Micket/5cd103638b2d809266602ae7ce39df1a for a full test report.

@Micket Micket merged commit 9c1f56e into easybuilders:develop Jan 13, 2026
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@Micket Micket added this to the next release (5.2.1?) milestone Jan 13, 2026
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boegel commented Jan 14, 2026

@Thyre Mention during EB conf call: does same problem exist for hwloc in previous easyconfig generations as well?

If so, please open an issue to follow-up, or a PR (we can't keep track of TODOs in merged PRs)

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Thyre commented Jan 14, 2026

@Thyre Mention during EB conf call: does same problem exist for hwloc in previous easyconfig generations as well?

If so, please open an issue to follow-up, or a PR (we can't keep track of TODOs in merged PRs)

2025a is also affected. Will open a follow up PR at latest tomorrow.

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Thyre commented Jan 14, 2026

@boegel done in #25063

@boegel boegel mentioned this pull request Jan 15, 2026
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@boegel boegel changed the title add patches to hwloc v2.12.1 to better handle ACPI CPCC add patches to hwloc v2.12.1 to better handle ACPI CPCC, fixes performance regression in MPI startup time (time required for MPI_Init) Jan 15, 2026
@boegel boegel changed the title add patches to hwloc v2.12.1 to better handle ACPI CPCC, fixes performance regression in MPI startup time (time required for MPI_Init) add patches to hwloc v2.12.1 to better handle ACPI CPCC, fixes performance regression in MPI startup time (time required for MPI_Init) Jan 15, 2026
@boegel boegel changed the title add patches to hwloc v2.12.1 to better handle ACPI CPCC, fixes performance regression in MPI startup time (time required for MPI_Init) add patches to hwloc v2.12.1 to better handle ACPI CPCC, fixes performance regression in MPI startup time (MPI_Init) Feb 19, 2026
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