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Improved Db2 backup thread (db2bm and db2med) binding/distribution on NUMA systems
On a large NUMA systems with a very fast storage and a fast backup target memory affinity might affect backup time as well as the overall system performance during the activity. Currently, with the Db2's automatic thread NUMA binding (DB2_RESOURCE_POLICY=AUTOMATIC), all backup buffer manipulator threads (db2bm EDUs) are affinitized with the same node on which backup coordinator agent was started whilst media controller EDUs (db2med) are bound to a different NUMA node. This behaviour is sub-optimal performance wise and might lead to a saturation of the CPU interconnects. Db2 should be able to distribute backup threads across multiple NUMA nodes, preferably colocating db2bm, db2med pairs and ideally affinitize utility heap memory associated with those.
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