buildbot-profiler 1.1.0

"Profiler for buildbot master and its UI"

This plugin implements a profiler for buildbot master.

• It uses statistical profiling loosely based on plop https://github.com/bdarnell/plop

• Suitable for prod as statistical profiling is very low overhead

• Profiles all threads including main thread and db threads

• Removes noise samples when the threads are actually in the main loop

• In-browser UI based on nvd3 and d3-flame-graph

• Show cpu and memory percent over time

• flame graph can be restricted to a subset of the trace

• Detailed caller/callee are displayed when clicking on a function

Usage

installation:

pip install buildbot_profiler

then in master.cfg:

c['www']['plugins']['profiler'] = True

Alternatively, you can install it in service mode, without the UI

c['services'] = [util.ProfilerService()]

ProfilerService takes following arguments:

ProfilerService(frequency=100, gatherperiod=30 * 60, mode='virtual', basepath=None, wantBuilds=100)

• frequency: the profiling frequency in HZ. Not that if there is no activity during a profiling timer, no data will be recorded.

• gatherperiod: the period during which the profiler works on one file. By default a new json file is created every 30min with the profile of the last 30min. Note that if there is no activity the gather period might be longer.

• mode: profiling timer to use. Can be:

  • prof: use SIG_PROF timer,

  • virtual: use SIGVTALRM timer,

  • real: use SIGALRM timer,

• basepath: the base path where to store the json files. (defaults to (master's basedir)/prof_)

• wantBuilds: if this is > 0 then the last N builds are stored along side the profile data, for debug purpose.

Standalone Viewer

A standalone viewer is provided for offline browse of user submitted profiles.

bbprofiler

Then you can open your browser on http://localhost:8080

Screenshot