Go 1.25 add container-ware GOMAXPROCS. Instead of assuming it has all available processors, go respects the cgroupv2 specified CPU limits. This feature ensures resources aren’t incorrectly used or killed for trying to access or use too much CPU.
You can disable this feature using containermaxprocs=0 or tweaking it as you need (for instance only specifying 1 CPU when you have 2 or 8 threads available).
Thanks to Karthik for the heads up….
Priya Seth posted about Open Source Wheel Packages for Linux on Power:
IBM provides a dedicated repository of Python wheel packages optimized for the Linux on Power (ppc64le) architecture. These pre-built binaries simplify Python development on Power systems by eliminating the need to compile packages from source—saving time and reducing complexity.
Wheel files (.whl) are the standard for distributing pre-compiled Python packages. For developers working on Power architecture, having access to architecture-specific wheels ensures compatibility and speeds up development.
IBM hosts a curated collection of open-source Python wheels for the ppc64le platform listed at https://open-source-edge.developerfirst.ibm.com/
Use pip to download the package without installing it:
pip download <package_name>==<version> --prefer-binary --index-url=https://wheels.developerfirst.ibm.com/ppc64le/linux --verbose --no-deps
Replace <package_name> and <version> with the desired values.
Whether you’re building AI models, data pipelines, or enterprise applications, this repository helps accelerate your Python development on Power.
You can also refer to https://community.ibm.com/community/user/blogs/nikhil-kalbande/2025/08/01/install-wheels-from-ibm-python-wheel-repository
The Red Hat Multi-Arch Tuning Operator optimizes workload placement within multi-architecture compute clusters. Pods run on the compute architecture for which the containers declare support. Where Operators, Deployments, ReplicaSets, Jobs, CronJob, Pods don’t declare a nodeAffinity, in most cases, the Pods that are generate are updated with the node affinity so it lands on the supported (declared) CPU Architecture.
For version 1.1.0, the Red Hat Multi-Arch Team, @Prashanth684, @aleskandro, @AnnaZivkovic and IBM Power Systems team @pkenchap have worked together to give cluster administrators better control and flexibility. The feature adds a plugins field in ClusterPodPlacementConfig and have build a first plugin called nodeAffinityScoring.
Per the docs, the nodeAffinityScoring plugin adds weights and influence to the scheduler with this process:
To take advantages of this feature, use the following to asymmetrically load the Power nodes with work.
apiVersion: multiarch.openshift.io/v1beta1
kind: ClusterPodPlacementConfig
metadata:
name: cluster
spec:
logVerbosityLevel: Normal
namespaceSelector:
matchExpressions:
- key: multiarch.openshift.io/exclude-pod-placement
operator: Exists
plugins:
nodeAffinityScoring:
enabled: true
platforms:
- architecture: ppc64le
weight: 100
- architecture: amd64
weight: 50
Best wishes, and looking forward to hearing how you use the Multi-Arch Tuning Operator on IBM Power with Multi-Arch Compute.
nx-gzip requires the licensed process caability active_mem_expansion_capable
Login to your HMC
for MACHINE in my-ranier1 my-ranier2
do
echo "MACHINE: ${MACHINE}"
for CAPABILITY in $(lssyscfg -r sys -F capabilities -m "${MACHINE}" | sed 's|,| |g' | sed 's|"||g')
do
echo "CAPABILITY: ${CAPABILITY}" | grep active_mem_expansion_capable
done
echo
doneThe following shows:
MACHINE: my-ranier1
CAPABILITY: active_mem_expansion_capable
CAPABILITY: hardware_active_mem_expansion_capable
CAPABILITY: active_mem_mirroring_hypervisor_capable
CAPABILITY: cod_mem_capable
CAPABILITY: huge_page_mem_capable
CAPABILITY: persistent_mem_capable
MACHINE: my-ranier2
CAPABILITY: cod_mem_capable
CAPABILITY: huge_page_mem_capable
CAPABILITY: persistent_mem_capableThen you should be all set to use nx-gzip on my-ranier1
Best wishes
I was not aware of the mtr which Network diagnostic tool combining 'traceroute' and 'ping'.
You can quickly install on RHEL/Centos with sudo dnf install -y mtr
The output is super helpful to where you have drops:
mtr --report bastide.org
Start: 2025-04-04T12:44:43-0400
HOST: nx-gzip-d557-bastion-0.x Loss% Snt Last Avg Best Wrst StDev
1.|-- 10.20.176.3 0.0% 10 1.9 1.2 0.9 1.9 0.3
2.|-- 172.16.32.4 0.0% 10 0.7 0.7 0.7 0.8 0.0
3.|-- att-vc-srx-interconnect.p 0.0% 10 30.2 33.9 25.4 62.6 11.0
4.|-- XX.5.16.XXX 0.0% 10 11.8 11.8 11.7 12.0 0.1
5.|-- po97.prv-leaf6a.net.unifi 0.0% 10 62.5 63.2 62.5 67.5 1.5Running multiple OpenVPN on the mac, sometimes my DNS hangs and I can’t get the VPNs. I use this hack to get around it.
❯ sudo networksetup -setdnsservers Wi-Fi "Empty"Quick hack to find stack trace.
Look in proc find /proc -name stack
You can see the last stack for example… /proc/479260/stack
[<0>] hrtimer_nanosleep+0x89/0x120
[<0>] __x64_sys_nanosleep+0x96/0xd0
[<0>] do_syscall_64+0x5b/0x1a0
[<0>] entry_SYSCALL_64_after_hwframe+0x66/0xcb
It superb to figure out a real-time hang and pattern.
My colleague, Michael Q, introduced me to a vim extension that left me saying… that’s awesome.
set cuc which enables Cursor Column, and when I use it with set number, it’s awesome to see correct indenting
The commands are:
Shift + :set cuc and enterShift + :set number and enter
Use set nocuc to disable
Good luck…
Post Script
dnf install -y vimReference VimTrick: set cuc
The IBM Linux on Power team updated the open source container images list on their IBM Container Registry (ICR). You can find out more at https://community.ibm.com/community/user/powerdeveloper/blogs/priya-seth/2023/04/05/open-source-containers-for-power-in-icr
podman pull icr.io/ppc64le-oss/redis-ppc64le:v7.4.1-bv Nov 21, 2024podman pull icr.io/ppc64le-oss/mongodb-ppc64le:6.0.13-bv Nov 21, 2024podman pull icr.io/ppc64le-oss/rocketchat-ppc64le:6.11.1 Nov 21, 202The milvus 2.4.11 container is added to the list of OpenSource Containers:
podman pull icr.io/ppc64le-oss/milvus-ppc64le:v2.4.11
My colleague, Paul Chapman, has a nice article on .NET 9.0 running on IBM Power.
https://community.ibm.com/community/user/powerdeveloper/blogs/paul-chapman/2024/11/21/dotnet9
Best wishes.