On Ubuntu Linux, is it normal for mandb to run continuously (apparently in the background)?

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http://unix.stackexchange.com – I have access to a Ubuntu Linux node at my institution. The nodes are shared among the group, but typically I am the only person who uses this particular node. I am running a calculation in parallel on all 8 CPUs on this node. My calculation runs, but when I view the active processes using top, I see an additional process that says user man and command mandb. This mandb command seems to be running every time I look at top, and it appears to take up a fairly appreciable amount of CPU power (6 %CPU) and memory (2.5 %MEM), according to top. When I look around on the internet, it seems that: (HowTos)