Hi, I am investigating NUMA issues.
I have been aware that bin/cassandra tries to use interleave all policy if available. https://issues.apache.org/jira/browse/CASSANDRA-2594 https://issues.apache.org/jira/browse/CASSANDRA-3245 So what about /proc/sys/vm/zone_reclaim_mode? Any recommendations? I didn't find any in respect to Cassandra. By default on Linux NUMA machine, this is set 1 that tries to reclaim some pages in a zone rather than acquiring others from the other zones. Explicitly disabling this sounds better. "It may be beneficial to switch off zone reclaim if the system is used for a file server and all of memory should be used for caching files from disk. In that case the caching effect is more important than data locality." https://www.kernel.org/doc/Documentation/sysctl/vm.txt Thanks! Takenori
