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  • shoyer · 5 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
298433889 https://github.com/pydata/xarray/issues/1340#issuecomment-298433889 https://api.github.com/repos/pydata/xarray/issues/1340 MDEyOklzc3VlQ29tbWVudDI5ODQzMzg4OQ== shoyer 1217238 2017-05-01T21:11:15Z 2017-05-01T21:11:15Z MEMBER

@karenamckinnon In this case, it was in the file paths, i.e., /glade/apps/opt/pandas/0.14.0/gnu/4.8.2/lib/python2.7/site-packages/pandas-0.14.0-py2.7-linux-x86_64.egg/pandas/core/index.pyc

 
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   round-trip performance with save_mfdataset / open_mfdataset 218260909
297572440 https://github.com/pydata/xarray/issues/1340#issuecomment-297572440 https://api.github.com/repos/pydata/xarray/issues/1340 MDEyOklzc3VlQ29tbWVudDI5NzU3MjQ0MA== shoyer 1217238 2017-04-26T23:48:29Z 2017-04-26T23:48:29Z MEMBER

@karenamckinnon From your traceback, it looks like you're using pandas 0.14, but xarray requires at least pandas 0.15.

 
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   round-trip performance with save_mfdataset / open_mfdataset 218260909
297566576 https://github.com/pydata/xarray/issues/1340#issuecomment-297566576 https://api.github.com/repos/pydata/xarray/issues/1340 MDEyOklzc3VlQ29tbWVudDI5NzU2NjU3Ng== shoyer 1217238 2017-04-26T23:08:55Z 2017-04-26T23:08:55Z MEMBER

@karenamckinnon could you please share a traceback for the error?

 
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   round-trip performance with save_mfdataset / open_mfdataset 218260909
290480036 https://github.com/pydata/xarray/issues/1340#issuecomment-290480036 https://api.github.com/repos/pydata/xarray/issues/1340 MDEyOklzc3VlQ29tbWVudDI5MDQ4MDAzNg== shoyer 1217238 2017-03-30T17:18:22Z 2017-03-30T17:18:22Z MEMBER

Indeed, it's not. We should add some way to pipe this arguments through auto_combine on to concat.

 
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   round-trip performance with save_mfdataset / open_mfdataset 218260909
290477014 https://github.com/pydata/xarray/issues/1340#issuecomment-290477014 https://api.github.com/repos/pydata/xarray/issues/1340 MDEyOklzc3VlQ29tbWVudDI5MDQ3NzAxNA== shoyer 1217238 2017-03-30T17:07:50Z 2017-03-30T17:07:50Z MEMBER

My strong suspicion is that the bottleneck here is xarray checking all the coordinates for equality in concat, when deciding whether to add a "time" dimension or not.

Try passing coords='minimal' and see if that speeds things up. See the concat documentation for details: http://xarray.pydata.org/en/stable/generated/xarray.concat.html#xarray.concat

This was a convenient check for small/in-memory datasets but possibly it's not a good one going forward. It's generally slow to load all the coordinate data for comparisons, but it's even worse with the current implementation, which computes pair-wise comparisons of arrays with dask instead of doing them in parallel all at once.

 
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   round-trip performance with save_mfdataset / open_mfdataset 218260909

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