Tag: linux

When building containers for HPC it is more than advisable to measure how much memory, CPU time and other resources such container needs. We had to dive deep into detailed resources accounting on Linux to get some actual numbers.

Benchmarking different implementations of the same algorithm against each other can be done only if comparable systems are used. Our vlibench package ensures that CPU model information is present in benchmarking models. However if the package is run on Linux under x86_64 emulation on ARM, strange things happen.

As has been announced earlier, I had the opportunity to talk about recent rclone developments at the LinuxDays conference. Although the talk started at 10AM, the auditorium was crowded and it turns out many people were actually very interested how it is possible to ensure decent confidentiality when using public cloud object storage services!

As most of the servers running actual software are these days virtual machines, in our case running under KVM, having a serial console accessible from the hypervisor is always a good idea in case troubleshooting is needed without network access.

I would like - if I may - to take you on a strange journey.

As a part of developing a simple UDP-based networking application for Linux where the client may communicate with the server over multiple physical network connections, we needed to programatically setup source-based routing. It seemed like a really simple task. A simple task which turned into a roller coaster ride from the heights of pure amusement to the very depths of hell itself.