Hello, I finished quick testing of two h-metrics instances running on the same host both using the same external cassandra node. Motivation for this was to find a bottleneck. - with additional h-metric instance the throughput was increased almost linearly - question was why it's not possible to get higher throughput from single h-metrics instance while we know that cassandra node is not the bottleneck Test: 1 - run perf tests against 1 h-metrics with 4GB memory using one external cassandra node 2 - run perf tests against 2 h-metrics with 2GB memory each (on the same VM as previous test) using one external cassandra node (again the same VM as previous test) 3 - compare results Results: - for small msgs (1 metrics per request) there was almost no difference -> CPU was fully utilized -> for small msgs the CPU is bottleneck - for bigger msgs (100 metrics per request) total throughput was almost 2 times better -> it's possible to get 2 times better throughput from the same VM -> neither cpu, nor memory, nor network is the bottleneck -> h-metrics is doing some kind of throttling - I tried 500 metrics per request as well but I was getting timout exceptions. Maybe it was too much for this VM. Filip