Posts Tagged ‘sar’

Yesterday I wrote about CPU Performance Analysis in Linux. I explained how to tell if you are experiencing a CPU bottleneck. This is just a quick followup to show the effect of adding more cpu power. (more…)

A while back I wrote a post Analyzing Linux System Performance and Finding Bottlenecks. I did’t really give a good explanation of determining if you are CPU bound or not so I am writing this post to clear that up. (more…)

System performance analytics seems to be a frequent question on forums and mailing lists. Finding out why something is slow is generally nontrivial as there are many factors to consider. I have found the sysstat package to be an invaluable tool when looking at system performance. Specifically the command sar gives a wealth of information. (more…)

Text processing is fun. Well, fun if you like to beat your head against a wall. Most of the time I just string a few things together to get whatever I am doing done. Its much better to find the shortest way to do something, it spawns less processes, is more efficient and generally a good idea. So if you have ever wanted to match a string from some given output and only print the preceding line here you go. (more…)