How to use fine performance metrics?

[noahblakesmith]

I am trying to identify the cause of performance issues on a virtual machine. The fine performance metrics show "thread-noncpu" comprises a large share of task execution activities.

When this occurs, Dask's help page suggests "you probably want to break it down by function and isolate those that are known to perform I/O or GPU activity." However, I am struggling to do so, as the scheduler fused all functions (see "read-fused-toparquetdata" in the drop-down menu).

By any chance do you have guidance on how to investigate?

Thank you!