Le 16/12/2014 00:42, Ori Livneh a écrit : > I'm writing to draw your attention to a newly-available resource for > performance analysis: flame graphs of MediaWiki code. > > http://performance.wikimedia.org/xenon/svgs/ > > Flame graphs are a visualization of application stack traces. > > Each application server on the Wikimedia cluster has a software timer that > interrupts MediaWiki once every ten minutes to capture a stack trace. The > stack trace shows what the code the application server was in the process > of executing when the timer expired. A central log aggregator collects > these traces and uses them to generate flame graphs. > > Each box in a flame graph represents a function in the stack. The y-axis > shows stack depth. The topmost box shows the function that was on-CPU at > the moment the trace was captured. The function below a function is its > parent. > > The x-axis spans the sample population. The width of the box shows the > total time it was on-CPU or part of an ancestry that was on-CPU, based on > sample count. > > Here is an example: > http://performance.wikimedia.org/xenon/svgs/hourly/2014-12-15_22.svgz > > To learn more about flame graphs and how to interpret them, see < > http://www.brendangregg.com/flamegraphs.html>.
Well done Ori, they are lovely and make me think of the 90's ascii arts. -- Antoine "hashar" Musso _______________________________________________ Wikitech-l mailing list Wikitech-l@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikitech-l
