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https://issues.apache.org/jira/browse/BEAM-9085?focusedWorklogId=401101&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-401101
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ASF GitHub Bot logged work on BEAM-9085:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 11/Mar/20 01:11
            Start Date: 11/Mar/20 01:11
    Worklog Time Spent: 10m 
      Work Description: tvalentyn commented on issue #11092: [BEAM-9085] Fix 
performance regression in SyntheticSource
URL: https://github.com/apache/beam/pull/11092#issuecomment-597394055
 
 
   Thanks, @kamilwu. I'll have to take a closer look - I see that this pr 
causes a 8x slowdown in one of the benchmarks we run internally. I don't know 
yet where it comes from.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 401101)
    Time Spent: 4h 20m  (was: 4h 10m)

> Performance regression in np.random.RandomState() skews performance test 
> results across Python 2/3 on Dataflow
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: BEAM-9085
>                 URL: https://issues.apache.org/jira/browse/BEAM-9085
>             Project: Beam
>          Issue Type: Bug
>          Components: testing
>            Reporter: Kamil Wasilewski
>            Assignee: Kamil Wasilewski
>            Priority: Major
>          Time Spent: 4h 20m
>  Remaining Estimate: 0h
>
> Tests show that the performance of core Beam operations in Python 3.x on 
> Dataflow can be a few time slower than in Python 2.7. We should investigate 
> what's the cause of the problem.
> Currently, we have one ParDo test that is run both in Py3 and Py2 [1]. A 
> dashboard with runtime results can be found here [2].
> [1] sdks/python/apache_beam/testing/load_tests/pardo_test.py
> [2] https://apache-beam-testing.appspot.com/explore?dashboard=5678187241537536



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