make best use of VCore in Hive

[mahender bigdata]

Hi,

Currently we are doing join 2-3 big tables and couple of Left Joins. We 
are running on 40 node cluster, During query execution, we could see all 
the memory has been utilized completely (100%), which is perfect. But 
Number of VCore used are less than 50%. Is there a way to increase usage 
of number of cores to almost 90-100% . Can setting Number of Tasks for 
mapper and reduce with TEZ execution makes effectively VCore ?. Any 
guidance on VCore maximum utilization.