Myasnikov Daniil
67600f47ef
The canary answers "did this runner get the work done" for the CPU and for memory, and every disk hypothesis on the node-join lane has been closed on byte counts. A byte count says a transfer happened; it says nothing about what the transfer cost, and nothing anywhere in this tree has ever measured how long the storage takes to answer. The one field already in the report that would say is delayacct_blkio_ticks, carried verbatim in every per-thread stat line the QEMU thread capture writes. It reads zero on all 225 threads of both samples of a green run and of a red one, which is what it reads on any kernel booted without `delayacct`, so it is silence rather than a finding. So a third arm: 4096 single 4 KiB writes under O_DIRECT, issued one at a time, so the rate divides to operations a second at queue depth one and its reciprocal is how long one write took to reach the volume. O_DIRECT is the load-bearing part -- without it the write lands in the page cache and returns, and the arm would report a healthy volume at any storage speed, which is the one failure a collector meant to stand alone on a red run cannot have. The probe file is written outside the report directory, because an arm the ceiling stops leaves its file behind and a file inside the report ships in the artifact. Why the canary rather than a collector of its own: it is the only instrument that runs on the passing path as well as the failing one and brackets the wait on both. Twelve of the seventeen captures a red report carries are failure-path only, so a green report has nothing for them to be compared against, and a disk reading with no green baseline would answer in one direction only. The floor is 300 operations a second, crossing at 13.7s inside the 20s ceiling, for the reason the memory floor sits where it does: a floor the ceiling reaches first never fires. 300 a second is 3.3ms for one 4 KiB write, pathological for any block device rather than merely slow. This is the third arm and there is no room for a fourth. The phase budget guard prices the canary from the arm count it reads out of the source, so this moved the collectors gated ahead of the serial console from 435s to 460s against a 480s budget; a fourth arm would be 485s and would fail that guard rather than silently overspend. Verified in the sandbox image itself, on the overlay the QEMU disk images live on: 4096 direct writes in 60ms, no probe file left behind. Assisted-By: Claude <noreply@anthropic.com> Signed-off-by: Myasnikov Daniil <myasnikovdaniil2001@gmail.com>
Cozystack
Cozystack is a free platform and framework for building clouds.
Cozystack is a CNCF Sandbox Level Project that was originally built and sponsored by Ænix.
With Cozystack, you can transform a bunch of servers into an intelligent system with a simple REST API for spawning Kubernetes clusters, Database-as-a-Service, virtual machines, load balancers, HTTP caching services, and other services with ease.
Use Cozystack to build your own cloud or provide a cost-effective development environment.
Use-Cases
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Using Cozystack to build a public cloud
You can use Cozystack as a backend for a public cloud -
Using Cozystack to build a private cloud
You can use Cozystack as a platform to build a private cloud powered by Infrastructure-as-Code approach -
Using Cozystack as a Kubernetes distribution
You can use Cozystack as a Kubernetes distribution for Bare Metal
Documentation
The documentation is located on the cozystack.io website.
Read the Getting Started section for a quick start.
If you encounter any difficulties, start with the troubleshooting guide and work your way through the process that we've outlined.
Versioning
Versioning adheres to the Semantic Versioning principles.
A full list of the available releases is available in the GitHub repository's Release section.
Contributions
Contributions are highly appreciated and very welcomed!
In case of bugs, please check if the issue has already been opened by checking the GitHub Issues section. If it isn't, you can open a new one. A detailed report will help us replicate it, assess it, and work on a fix.
You can express your intention to on the fix on your own. Commits are used to generate the changelog, and their author will be referenced in it.
If you have a concrete feature request, open an issue. For a cross-cutting or architectural change, open a design proposal in the community repo. For questions or early ideas, use GitHub Discussions. See CONTRIBUTING.md for the full routing.
Community
You are welcome to join our Telegram group and come to our weekly community meetings. Add them to your Google Calendar or iCal for convenience.
License
Cozystack is licensed under Apache 2.0.
The code is provided as-is with no warranties.
Commercial Support
A list of companies providing commercial support for this project can be found on official site.