• Linux,  Work

    Linux performance improvements

    Two years ago I wrote an article presenting some Linux performance improvements. These performance improvements are still valid, but it is time to talk about some new improvements available. As I am using Debian now, I will focus on that distribution, but you should be able to easily implement these things on other distributions too. Some of these improvements are best suited for desktop systems, other for server systems and some are useful for both.

  • Linux,  Work

    Improving Mediawiki performance

    Now that I am on the subject of improving performance, I configured some performance improvements for a Mediawiki installation here: Make sure you run the latest Mediawiki version. Mediawiki 1.16 introduced a new localisation caching system which is supposed to improve performance, so you definitely want this to get the best performance. Create a directory where Mediawiki can store the localisation cache (make sure it is writable by your web server). By preference store it on a tmpfs (at least if you are sure it will be big enough to store the cache), and configure it in LocalSettings.php: $wgCacheDirectory = "/tmp/mediawiki"; Iif /tmp is on a tmpfs, you might add…

  • Linux,  Work

    Improving performance by using tmpfs

    Today I analyzed disk reads and writes on a server with iotop and strace and found some interesting possible optimizations. With iotop you can check which processes are reading and writing from the disks. I always press the o, p and a keys in iotop so that it only shows me processes doing I/O and so that it will show accumulated I/O instead of the bandwidth. With the left and right arrows I select on which columns to sort the list. Once you have identified the processes wich are doing much I/O, you can check what they are reading or writing with strace, for example # strace  -f -p $PID …

  • Linux,  Mandriva

    Speeding up my Linux system

    My Mandriva 2009.1 system at home had become a bit slow lately, and so I decided to do some attempts to make it a bit faster again. This is not the most powerful system anymore (Asus A8N-SlI NForce4 motherboard, Athlon 64 3500+, 3 GB RAM, 250 GB SATA-1 disk, NVidia 6600 GT graphics card), but it sometimes felt very slow because of lots of disk activity, especially during start-up. I succeeded in improving the performance noticeably: the disk activity now stops much earlier after log-in and after starting Evolution. I did some different changes at once and have not always measured what was the impact of each individual change. So…

  • Linux,  Uncategorized

    Fix bad performance with NVidia 177.80 drivers

    Since I upgraded to Nvidia’s beta driver series which were supposed to improve performance for KDE 4 (including the now stable version 177.80), my GNOME desktop on my system with a Geforce 6600 GT graphics card, felt a lot slower. It was most noticeable when browsing the web with Firefox. When quickly scrolling a web page with my mouse’s scroll wheel, X started eating 100% of CPU time and the image on the screen started lagging behind a lot. Also just rendering a page seemed to be much slower. Disabling smooth scrolling in Firefox, did not help at all. Searching on the web, I found out that I’m not the…