issue_comments: 375020977
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html_url | issue_url | id | node_id | user | created_at | updated_at | author_association | body | reactions | performed_via_github_app | issue |
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https://github.com/pydata/xarray/issues/2004#issuecomment-375020977 | https://api.github.com/repos/pydata/xarray/issues/2004 | 375020977 | MDEyOklzc3VlQ29tbWVudDM3NTAyMDk3Nw== | 1217238 | 2018-03-21T17:08:15Z | 2018-03-21T17:08:15Z | MEMBER | The culprit appears to be netCDF4-python and/or netCDF-C: ``` f = netCDF4.Dataset('test.nc') %time f['xarray_dataarray_variable'][:, ::10] CPU times: user 313 ms, sys: 1.23 s, total: 1.54 s``` When I try doing the same operation with h5netcdf, it runs very quickly: ```python reopened = xr.open_dataarray('test.nc', engine='h5netcdf') %time reopened[::1, ::10].compute() CPU times: user 6.11 ms, sys: 3.63 ms, total: 9.74 ms``` |
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