When a GNU/Linux machine exhibits a high iowait (i.e. more than 20% of the processor time is locked waiting for IO to complete), it does not always mean a lot of bytes are read or written. It is demonstrated that reading randomly on the disk will create conditions in which less than 5Mb/s are read and the disk will be busy most of the time, which translates into an iowait greater than 20%. A workaround is to give more RAM to the (virtual) machine so that pages read are cached in memory and read only once, therefore reducing the probability of random reads.
Continue reading “random read disk stress test”
When using adbapi with a sqlite backend, it is demonstrated that the memory footprint depends on the number of simultaneous connections running at a given moment. This memory is not reclaimed, but it is reused. On an amd64 processor it approximately amounts to 2KB per simultaneous connection.
Continue reading “adbapi memory footprint”
The alternate gallifrey repository was assembled from the source and debian GIT repositories and complemented with packages found in the official dak. Some virtual packages ( gallifrey, dahdi-linux-modules, sangoma-wanpipe-modules and misdn-kernel-modules) where hand made. The resulting repository was compared to check for its useability.
Continue reading “An alternate XiVO gallifrey repository (part 2/2)”
Benchmarks using tsung on cardstories showed that long poll requires almost no resources, the server is stable with 25 simultaneous requests served in less than 50ms each and that it overloads when going over 200 simultaneous requests.
Continue reading “benchmarking cardstori.es with tsung”
When the invitations look like email addresses, the permalink to the game is sent to the corresponding address. The CardstoriesService class was re-architectured for consistency. The interaction and artwork issues were discussed extensively with Xavier Antoviaque and tartarugafeliz. Solutions and new graphics will be provided.
Continue reading “cardstories part 15: invitations”
The Xine library Debian GNU/Linux package lintian warnings were fixed. The bug introduced by the lack of v4l support in the 2.6.38 linux kernel was fixed.
Continue reading “xine lintian and FTBFS fixes”
Although the virtual machine hosting lacie-nas.org has 1GB of RAM, it suffers from memory shortage on a daily basis. The causes were analyzed and it was concluded that it will migrate to a larger (4GB and 4CPUs) host. GRUB2 was installed and configured to boot on linux 2.6.38.
Continue reading “lacie-nas.org system administration”
An altnernate gallifrey repository repository was created and should be useable in two weeks from now as an alternative to the official repository. The 1.2.38 release of packaging-farm was produced with the bug fixes done in the process.
Continue reading “An alternate XiVO gallifrey repository (part 1/2)”
The –game-timeout option was added to specify that a game left unattended during more than 24h should either be canceled or proceed to the next state. At present the author of the game is required to act to go from the invitation state to the vote state and then to the complete state. The same functions used for the timeout could be used to automate these steps.
Continue reading “cardstories part 14: cancel and autoplay”