> Would you recommend to disable system swap as a rule? I'm running on Debian > 64bit and am seeing light swapping:
I'm not Jonathan, but *yes*. I would go so far as to say that disabling swap is a good rule of thumb for *most* production systems that serve latency sensitive traffic. For a machine dedicated to Cassandra, you definitely want to disable swap. There's just nothing to be gained really, but lots to loose. There is nothing that you *want* swapped out. All the memory you use needs to be in memory. You don't want the heap swapped out, you don't want the off-heap jvm malloc stuff swapped out, you don't want stacks swapped out,etc. As soon as you start swapping you very quickly run into poor and unreliable performance. Particularly during GC. -- / Peter Schuller
