issue_comments: 135510417

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https://github.com/pydata/xarray/issues/516#issuecomment-135510417 https://api.github.com/repos/pydata/xarray/issues/516 135510417 MDEyOklzc3VlQ29tbWVudDEzNTUxMDQxNw== 3688009 2015-08-27T18:11:43Z 2015-08-27T18:11:43Z NONE

using ncdump -hs, I found the chunk sizes of any of the files to be: _ChunkSizes = 1, 90, 180 ;

Using that, it took even more time:

``` datal = xray.open_mfdataset(filename, chunks={'time':1, 'lat':90, 'lon':180})

In [7]: %time datal.tasmax[:, 360, 720].values CPU times: user 3min 3s, sys: 59.4 s, total: 4min 3s Wall time: 12min 8s ```

I should say that I am using open source data, and therefore do not control how the original data is being chunked. This is also using open_mfdataset on around 100 files

 
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