Lack of IO monitoring on an ACLF DLIO benchmark

[tylerjereddy]

We may want to investigate this one: https://github.com/argonne-lcf/dlio_benchmark/blob/main/dlio_benchmark/configs/workload/unet3d.yaml

Report from Sandra Mendez on Slack that darshan runtime may not have been tracing the files that are opened by the pytorch data loader.

[tylerjereddy]

Probably related to gh-872.

[shanedsnyder]

Closing as I think this is resolved by #978