buildbot-profiler 1.2.1

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

ChangeLog

• 1.2.1 Fix issues with load calculation

• 1.2.0 Fold the flames so that you can explore larger traces.

  Fix the service so that the trace is reset between run.

• 1.1.0 add a service to use the profiler without bother the users with a profiler UI.
• 1.0.0 initial version