Moving postgres 9.4 databases to new vm hosted datacenter

We are presently planning to move our 9.4 production databases from our datacenter in Norfolk where they have been running on solid state hardware to a datacenter run by Expedient where they will run on pre-defined vms. Our manager of development has expressed concern that there may be a decline in performance - we had a similar decline several years ago when we attempted to switch to vms.

My question is: is there a facility we can install on the vm where we can simulate what we run on production now to approximate the load that we currently run? Perhaps a read / replay of the postgres logs? 
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