ASF GitHub Bot commented on ARROW-2071:

pitrou commented on issue #1550: ARROW-2071: [Python] Lighten serialization 
URL: https://github.com/apache/arrow/pull/1550#issuecomment-362698881
   Here are the runtimes on the manylinux Travis-CI job:
   ========================== slowest 15 test durations 
   3.96s call     
   2.35s call     tests/test_plasma.py::TestPlasmaClient::test_get
   1.91s call     
   1.53s call     tests/test_plasma.py::TestPlasmaClient::test_store_full
   1.32s call     tests/test_plasma.py::TestPlasmaClient::test_subscribe
   1.27s call     
   1.15s call     tests/test_plasma.py::TestPlasmaClient::test_create_existing
   1.10s call     
   0.98s call     tests/test_parquet.py::test_decimal_roundtrip
   0.75s call     
   0.64s call     tests/test_plasma.py::TestPlasmaClient::test_many_hashes
   0.46s call     tests/test_parquet.py::test_read_pandas_column_subset
   0.46s call     
   0.35s call     tests/test_parquet.py::test_pandas_parquet_column_multiindex
   0.33s call     tests/test_serialization.py::test_primitive_serialization
   ======== 513 passed, 47 skipped, 3 xfailed, 9 warnings in 27.87 seconds 
   There's really something weird with the offending Travis-CI job. Perhaps 
because it's building in debug mode?

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> [Python] Reduce runtime of builds in Travis CI
> ----------------------------------------------
>                 Key: ARROW-2071
>                 URL: https://issues.apache.org/jira/browse/ARROW-2071
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Wes McKinney
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.9.0
> For some reason, recently each Python build has been taking about 15 minutes 
> to run. I speculate this is due to VM thrashing caused by reduced resources 
> on the Travis CI workers, related to the problem I fixed in ARROW-2062.
> We should experiment, but it seems like perhaps this can be fixed either by:
> * Reducing the size of the Plasma store on Travis CI
> * Disabling valgrind in Plasma tests
> The slowness could be caused by something else, though, so we should 
> investigate (and have pytest report slow tests in the logs)

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