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  • CI: run tests in parallel (pytest-xdist) · 8 ✖

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747742696 https://github.com/pydata/xarray/pull/4694#issuecomment-747742696 https://api.github.com/repos/pydata/xarray/issues/4694 MDEyOklzc3VlQ29tbWVudDc0Nzc0MjY5Ng== mathause 10194086 2020-12-17T22:35:06Z 2020-12-17T22:35:06Z MEMBER

If it passes I am finished ;-)

 
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   CI: run tests in parallel (pytest-xdist) 766979952
747742542 https://github.com/pydata/xarray/pull/4694#issuecomment-747742542 https://api.github.com/repos/pydata/xarray/issues/4694 MDEyOklzc3VlQ29tbWVudDc0Nzc0MjU0Mg== dcherian 2448579 2020-12-17T22:34:43Z 2020-12-17T22:34:43Z MEMBER

sorry! didn't realize you were still working on it.

 
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   CI: run tests in parallel (pytest-xdist) 766979952
747742024 https://github.com/pydata/xarray/pull/4694#issuecomment-747742024 https://api.github.com/repos/pydata/xarray/issues/4694 MDEyOklzc3VlQ29tbWVudDc0Nzc0MjAyNA== dcherian 2448579 2020-12-17T22:33:30Z 2020-12-17T22:33:30Z MEMBER

Great. Thanks @mathause this is a great improvement!

 
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   CI: run tests in parallel (pytest-xdist) 766979952
745310983 https://github.com/pydata/xarray/pull/4694#issuecomment-745310983 https://api.github.com/repos/pydata/xarray/issues/4694 MDEyOklzc3VlQ29tbWVudDc0NTMxMDk4Mw== dcherian 2448579 2020-12-15T14:14:06Z 2020-12-15T14:14:06Z MEMBER

I updated my previous comment. It looks like -n 4 saved us 5 minutes on windows and didn't affect the others.

 
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   CI: run tests in parallel (pytest-xdist) 766979952
744788082 https://github.com/pydata/xarray/pull/4694#issuecomment-744788082 https://api.github.com/repos/pydata/xarray/issues/4694 MDEyOklzc3VlQ29tbWVudDc0NDc4ODA4Mg== dcherian 2448579 2020-12-14T23:20:56Z 2020-12-15T14:13:14Z MEMBER

Wow! Looks like a 30-40% improvement

(I'm not sure why the latest commit triggered two runs, but one of them has finished: https://dev.azure.com/xarray/xarray/_build?definitionId=1&_a=summary)

Before:

After -n 2

After -n 4

 
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   CI: run tests in parallel (pytest-xdist) 766979952
745288721 https://github.com/pydata/xarray/pull/4694#issuecomment-745288721 https://api.github.com/repos/pydata/xarray/issues/4694 MDEyOklzc3VlQ29tbWVudDc0NTI4ODcyMQ== mathause 10194086 2020-12-15T13:32:08Z 2020-12-15T13:32:08Z MEMBER

In the past, I've run into race conditions when using pytest-xdist for tests that required I/O tasks such as file downloading

It's not too difficult to remove the -n 4 and pytest-xdist again if we run into problems. It may, however, be more difficult to find out that random failures are due to race conditions...

 
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   CI: run tests in parallel (pytest-xdist) 766979952
744831125 https://github.com/pydata/xarray/pull/4694#issuecomment-744831125 https://api.github.com/repos/pydata/xarray/issues/4694 MDEyOklzc3VlQ29tbWVudDc0NDgzMTEyNQ== andersy005 13301940 2020-12-14T23:51:50Z 2020-12-14T23:51:50Z MEMBER

Nice! I think we get 2 hypter-threaded cores. So I can also try -n 4 and see if that helps. I wonder if there is any downside to this?

In the past, I've run into race conditions when using pytest-xdist for tests that required I/O tasks such as file downloading. So, it's likely everything will run fine with -n 4 provided we don't have tests with tasks that are likely to create race conditions. 

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   CI: run tests in parallel (pytest-xdist) 766979952
744808574 https://github.com/pydata/xarray/pull/4694#issuecomment-744808574 https://api.github.com/repos/pydata/xarray/issues/4694 MDEyOklzc3VlQ29tbWVudDc0NDgwODU3NA== mathause 10194086 2020-12-14T23:35:27Z 2020-12-14T23:35:27Z MEMBER

Looks like a 30-40% improvement

Nice! I think we get 2 hypter-threaded cores. So I can also try -n 4 and see if that helps. I wonder if there is any downside to this?

 
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   CI: run tests in parallel (pytest-xdist) 766979952

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