Scott Carey wrote:
Well, the first thing to do in any performance bottleneck investigation is
to look at the machine hardware resource usage.
During your test, what is the CPU use and disk usage? What about network
utilization?
Top, vmstat, iostat, and some network usage monitoring would be useful. It
could be many things causing your lack of scalability, but without actually
monitoring your machines to see if there is an obvious bottleneck its just
random guessing and hunches.
iotop is very good here
