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In fact, both readers should need 0% CPU when idle and aquire up to 100% when calculating. The 22%/50% values are no valid measures - at least if you were just sitting and watching the output of "top". If you're interested in getting reliable measurements, I suggest to measure CPU time consumed. Have a look at /proc/<PID>/sched, if you want "hard numbers" :-)
(The CVM will probably have a big startup overhead, which should probably be taken into account.)
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