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Re: Python profiling




On Fri, Nov 16, 2018 at 2:12 AM, Robert Bradshaw <robertwb@xxxxxxxxxx> wrote:
One needs to ensure that gprof2dot is importable (i.e. installed via pip into your Python environment). 

As for specifying the FnApiRunner via the runner argument, --runner can take fully qualified names (if it's not in the short list of known runners). However, the FnApiRunner is the DirectRunner for non-streaming mode, so there's no need to specify it explicitly. 

Good point about adding this to the documentation. It's unclear where best to put it...

How about in wiki under python tips? (https://cwiki.apache.org/confluence/display/BEAM/Python+Tips) From there it can be later converted to full user docs later.
 

On Thu, Nov 15, 2018 at 5:28 PM Thomas Weise <thw@xxxxxxxxxx> wrote:
Hi Robert,

This is great. It should be added to our Python documentation because users will like need this!

After I installed gprof2dot I'm still prompted to install:

"Please install gprof2dot and dot for profile renderings."

Also is there a way to run a pipeline unmodified with fn_api_runner? (For those interested in profiling the SDK worker.)

It works with direct runner, but "FnApiRunner" isn't currently supported as --runner argument:

python -m apache_beam.examples.wordcount \
  --input=/etc/profile \
  --output=/tmp/py-wordcount-direct \
  --runner=FnApiRunner \
  --streaming \
  --profile_cpu --profile_location=./build/pyprofile

Thanks,
Thomas


On Mon, Nov 5, 2018 at 7:15 PM Ankur Goenka <goenka@xxxxxxxxxx> wrote:
All containers are destroyed by default on termination so to analyze profiling data for portable runners, either disable container cleanup (using --retainDockerContainers=true) or use remote distributed file system path.

On Mon, Nov 5, 2018 at 1:05 AM Robert Bradshaw <robertwb@xxxxxxxxxx> wrote:
Any portable runner should pick it up automatically.
On Tue, Oct 30, 2018 at 3:32 AM Manu Zhang <owenzhang1990@xxxxxxxxx> wrote:
>
> Cool ! Can we document it somewhere such that other Runners could pick it up later ?
>
> Thanks,
> Manu Zhang
> On Oct 29, 2018, 5:54 PM +0800, Maximilian Michels <mxm@xxxxxxxxxx>, wrote:
>
> This looks very helpful for debugging performance of portable pipelines.
> Great work!
>
> Enabling local directories for Flink or other portable Runners would be
> useful for debugging, e.g. per
> https://issues.apache.org/jira/browse/BEAM-5440
>
> On 26.10.18 18:08, Robert Bradshaw wrote:
>
> Now that we've (mostly) moved from features to performance for
> BeamPython-on-Flink, I've been doing some profiling of Python code,
> and thought it may be useful for others as well (both those working on
> the SDK, and users who want to understand their own code), so I've
> tried to wrap this up into something useful.
>
> Python already had some existing profile options that we used with
> Dataflow, specifically --profile_cpu and --profile_location. I've
> hooked these up to both the DirectRunner and the SDK Harness Worker.
> One can now run commands like
>
> python -m apache_beam.examples.wordcount
> --output=counts.txt--profile_cpu --profile_location=path/to/directory
>
> and get nice graphs like the one attached. (Here the bulk of the time
> is spent reading from the default input in gcs. Another hint for
> reading the graph is that due to fusion the call graph is cyclic,
> passing through operations:86:receive for every output.)
>
> The raw python profile stats [1] are produced in that directory, along
> with a dot graph and an svg if both dot and gprof2dot are installed.
> There is also an important option --direct_runner_bundle_repeat which
> can be set to gain more accurate profiles on smaller data sets by
> re-playing the bundle without the (non-trivial) one-time setup costs.
>
> These flags also work on portability runners such as Flink, where the
> directory must be set to a distributed filesystem. Each bundle
> produces its own profile in that directory, and they can be
> concatenated and manually fed into tools like below. In that case
> there is a --profile_sample_rate which can be set to avoid profiling
> every single bundle (e.g. for a production job).
>
> The PR is up at https://github.com/apache/beam/pull/6847 Hope it's useful.
>
> - Robert
>
>
> [1] https://docs.python.org/2/library/profile.html
> [2] https://github.com/jrfonseca/gprof2dot
>