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Bypassing background thread creation for the oversize_arena used to be an optimization since that arena had eager purging. However #2466 changed the purging policy for the oversize_arena -- specifically it switched to the default decay time when background_thread is enabled. This issue is noticable when the number of arenas is low: whenever the total # of arenas is <= 4 (which is the default max # of background threads), in which case the purging will be stalled since no background thread is created for the oversize_arena. |
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