The "compact" commands takes the checkpoint mutex, which blocks on checkpoints. This was added by SERVER-43828, and causes slowness in certain concurrency workloads where the cost of checkpointing is high.

We should do two things:

• Lower the thread count and number of iterations of the compact.js and related workloads
• Blacklist the workload from the especially slow "concurrency_simultaneous_replication_wiredtiger_eviction_debug" and "concurrency_simultaneous_replication_wiredtiger_cursor_sweeps" suites. From what I understand, cursor sweeps block checkpoints, and eviction debug mode makes them slower, so it would be expected for the compact command to take a long time in scenarios.