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Lower the following WiredTiger file_manager parameters to wiredtiger_open:

close_handle_minimum: number of handles open before the file manager will look for handles to close. The WT default is 250. Lower to a more reasonable number like 4.
close_idle_time: amount of time in seconds a file handle needs to be idle before attempting to close it. The default is 28 hours. Lower to 10 seconds.
close_scan_interval interval in seconds at which to check for files that are inactive and close them. The WT default is 10. Lower to 5 seconds.

This will introduce more aggressive file handle sweeps.

duplicates

SERVER-41492 Disable WiredTiger cursor caching and introduce more aggressive file handle sweeps in testing

related to

SERVER-41020 Tweak or fuzz storage engine tunable parameters in testing

SERVER-41492 Disable WiredTiger cursor caching and introduce more aggressive file handle sweeps in testing