Distributed Processing Library command line

I've been looking in to how I can get multiple machines involved in a Techgen run.  I read the DPL  User Guide and it suggests some command line utilities for verifying the DPL config file (dplCfgValidator) and for testing the cluster (dplDiagCmdUtil).  However, when I try either of these I get a "DPL applications required Run DPL using a application" message.  I can't see where the manual says anything about this.  

> /opt/eda/cadence/EXT171/bin/dplCfgValidator -ConfigFile dp_config.xml
DPL applications required Run DPL using a application

>

Here is a version:

-----------------------------------------------------------------
Name : dplCfgValidator - Cadence DPL Engine - (64-bit)
Description : Cadence Shared Technology for Distributed Computing
Version : 8.3.3-a001
Build Ref. No. :
IR Build No. : Engineering build
Build Date : (01/19/2017 19:46:16)
-----------------------------------------------------------------

The other thing which wasn't clear in the manual was the relationship between <Host> tags in the XML DPL config file and the -dp_num command line argument.  Is there a way to tell the tool "just use all of the hosts" or do I need to count my hosts and use that as the argument to -dp_num?  The other thing which wasn't clear is the DPL config file lets me specify a number of jobs per host like:

<Host instance="8">host1</Host>

<Host instance="4">host2</Host>

so in this case do I use -dp_num 2 (for two hosts) or do I use -dp_num 12 (to get all slots on all machines)?

If it matters, I'm using <DPLEnvironment type="ssh">