issue_comments: 326868217

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https://github.com/pydata/xarray/issues/1521#issuecomment-326868217 https://api.github.com/repos/pydata/xarray/issues/1521 326868217 MDEyOklzc3VlQ29tbWVudDMyNjg2ODIxNw== 1217238 2017-09-04T05:18:55Z 2017-09-04T05:18:55Z MEMBER

So, to be more precise, I think the problem is that the first variable is computed many times over (once per comparison), inside the differs helper function above.

A very simple fix, slightly more conservative than loading every coordinate into memory, is to simply compute these first coordinates on the first variable, e.g., v = datasets[0].variables[vname] -> v = datasets[0].variables[vname].compute(). I am slightly nervous about the potential memory overhead of loading all coordinates into memory.

 
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