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Yes. I think so. I'm not familiar with specifically Centos7, however I do know that when Tableau Server is up and running, there are many associated sub-processes (i.e. vizql, dataserver), that pre-allocate threads which sit in an idle status until work is requested.
Example, when I look at a snapshot of task manager on one of my dev boxes, here is what's shown. There's not much going on, but there's a lot of idle threads which is normal.