These are pretty cool. I'd love to see a mobile specific one:
On Mon, Dec 15, 2014 at 3:48 PM, Aaron Schulz <aschulz(a)wikimedia.org> wrote:
Cool!
On Mon, Dec 15, 2014 at 3:42 PM, Ori Livneh <ori(a)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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