Last round of Scale testing

[roger peppe]

On 7 November 2013 19:44, roger peppe <rogpeppe at gmail.com> wrote:
> On 7 November 2013 13:18, John Arbash Meinel <john at arbash-meinel.com> wrote:
>> There is still the issue of what the process was doing when it hit 0%
>> CPU. I uploaded the traceback (xz compressed) to Ubuntu One, and it
>> should be here:
>> * sigquit.log.xz (2.7 MB) hosted on Ubuntu One:
>> http://ubuntuone.com/6vKrM07H7BTHUa9Xqvy16V
>
> I was interested to try to see what was going on here, so
> I hacked up a quick analysis program that puts all
> the stack traces into a call graph summarising the overall
> situation.
>
> It makes for an interesting snapshot of a juju system in action,
> although I haven't gained any particular insights
> from it yet.
>
> I've attached the output svg (suitable for web browser viewing) and
> the program I used to generate it.
>
> The nodes of the graph are functions; the count for each node
> is the number of goroutines in the stack traces that call that function;
> the count for each edge is the number of goroutines that have
> made the call between the two connected functions.
> The function that created a goroutine is included too.
>
> All cudos to go tool pprof for the svg stuff.

PS don't use the default SVG viewer - it's better to download
it and point your browser at the svg file directly.