how to tune "input queue wait"
I have a 3-node vertica cluster, and when I launch a count query, it takes about 160ms to complete the query, but when I launch lots of the same query concurrently, each query takes about 4s to complete !! so i dig out profile table and I found "input queue wait" of operator_name "Root" is outstanding large, about 3 seconds.
According to my experience, "Root" operator is the root node of physical plan tree, and if "Root" operator waits so long time, and I think it 's because of the concurrency control of vertica node. And， if I was correct, how I can tune vertica parameter? I can not find any related parameters in hp vertica complete doc.