html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/672#issuecomment-162463237,https://api.github.com/repos/pydata/xarray/issues/672,162463237,MDEyOklzc3VlQ29tbWVudDE2MjQ2MzIzNw==,7300413,2015-12-07T09:33:17Z,2015-12-07T09:33:17Z,NONE,"You were right, my chunk sizes were too large. It did not matter how many threads dask used either (4 vs. 8). The I/O component is still high, but that is also because I'm writing the final computed DataArray to disk.

Thanks!
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,120681918
https://github.com/pydata/xarray/issues/672#issuecomment-162419595,https://api.github.com/repos/pydata/xarray/issues/672,162419595,MDEyOklzc3VlQ29tbWVudDE2MjQxOTU5NQ==,7300413,2015-12-07T06:11:39Z,2015-12-07T06:11:39Z,NONE,"Hello, I ran it with the dask profiler, and I looked at the top output disaggregated by core.
It does seem to use multiple cores, but it seems to be using 8 threads when I looked at prof.visualize() (hyperthreading :P) and I feel this is killing performance.

How can I control how many threads to use?

Thanks,
Joy 
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,120681918
https://github.com/pydata/xarray/issues/672#issuecomment-162417283,https://api.github.com/repos/pydata/xarray/issues/672,162417283,MDEyOklzc3VlQ29tbWVudDE2MjQxNzI4Mw==,7300413,2015-12-07T05:46:15Z,2015-12-07T05:46:15Z,NONE,"I was trying to read ERA-Interim data, calculate anomalies using ds = ds - ds.mean(dim='longitude'), and similar operations along the time axis. Are such operations restricted to single cores?

Just multiplying two datasets (u*v) seems to be faster, though top shows two cores being used (I have 4 physical cores).

TIA,
Joy
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,120681918