> On 3 Dec 2015, at 11:48 PM, Kent Bower <[email protected]> wrote:
>
> Just trying to determine capacity utilisation for the process/server.
> Thank you!
>
> On Wed, Dec 2, 2015 at 4:21 PM, Graham Dumpleton <[email protected]
> <mailto:[email protected]>> wrote:
>
>> On 3 Dec 2015, at 2:03 AM, Kent <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Is there an external way to detect whether a thread is currently handling a
>> request or how many threads are currently handling requests?
>
> In the first instance have a look at:
>
> https://code.google.com/p/modwsgi/wiki/DebuggingTechniques#Extracting_Python_Stack_Traces
>
> <https://code.google.com/p/modwsgi/wiki/DebuggingTechniques#Extracting_Python_Stack_Traces>
>
> If don’t need so much detail and just after counts to determine capacity
> utilisation for the process/server, then there are ways of getting such
> metrics out of mod_wsgi itself.
>
> What I can’t remember right now is whether this specific metric is available
> in latest released version or still sitting on a branch with a bunch of other
> new metrics changes.
>
> What is the specific problem you are trying to solve?
What version of mod_wsgi are you using?
After checking, the more recent versions (not the much older versions on most
Linux distros) do have the metric counter I mention.
The process metrics are available using:
import mod_wsgi
current_metrics = mod_wsgi.process_metrics()
They include something like:
mod_wsgi.process_metrics: {'cpu_system_time': 0.009999999776482582,
'request_busy_time': 0.00033, 'current_time': 1449186182.184397,
'memory_max_rss': 9646080L, 'memory_rss': 9646080L, 'pid': 5485,
'restart_time': 1449186179.973325, 'request_count': 0L, 'cpu_user_time':
0.03999999910593033, 'running_time': 2L}
If you poll this at 1 second interval from a background thread, then capacity
utilisation is calculated using:
(current_metrics[‘request_busy_time’] - last_metrics[‘request_busy_time’])
/ (current_metrics[‘current_time’] - last_metrics[‘current_time’])
Personally I have been feeding this as well as a bunch of other stuff from
unreleased version in a mod_wsgi branch into InfluxDB and charting it using
Grafana. I should probably finally look at merging the branch so that people
can play with it. Just not 100% sure I may want to tweak it a bit yet.
Graham
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