These are pretty cool. I'd love to see a mobile specific one: https://phabricator.wikimedia.org/T78621

On Mon, Dec 15, 2014 at 3:48 PM, Aaron Schulz aschulz@wikimedia.org wrote:

Cool!

On Mon, Dec 15, 2014 at 3:42 PM, Ori Livneh ori@wikimedia.org wrote:

...

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.

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-- -Aaron S

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