Add quadratic mean xarray workload #896
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This is an xarray workload that apparently is a stereotypical example of workloads that don't run well on dask, see pangeo-data/distributed-array-examples#2
In it's current form, it runs into a lot of spilling and runs for about 2:30min even though it should be an almost embarrassingly parallel reduction. The culprit is dask.order see dask/dask#10384 (I have a bit of a messed up order prototype where this workload runs in ~30s)
I'm not writing this test case as adaptable to cluster size. Mostly because in my experience the automatic scaling functions do not exactly what they are supposed to and I consider the value-add not worth the time tweaking this to get it into the same shape.