my data node server has 256G memory and 32 cores, currently we are running 3 elasticsearch instances (processors set to 8 for each instance) in the servers. but it often hit high CPU issue.
our initial thinking is 24 cores go for elasticsearch and another 8 cores for OS... is this setting correct? what's the minimum core setting for os?
the example in below article says "e.g., if you’re running two instances of Elasticsearch on a 16-core machine, set processors to 8"
it doesn't allocate any core for OS...so what should be the correct way for my setup? (btw we are running version 2.4.1)