There is currently no built in support for this. There are a few ways to force this to work.
1) use the Exclusive property on a task. This will force only one task to run on a node at a time
job new
job add <id> /exclusive:true myapp.exe
2) Specify the numcores property on a task. For instance your cluster has 4 cores/node and you want 2 tasks to run on a node then ...
job new
job add <id> /numcores:2 myapp.exe
job add <id> /numcores:2 myapp.exe
job add <id> /numcores:2 myapp.exe
...
3) The thrird way is pretty draconian. You can force the OS to report fewer cores/node on the CNs. This would be a good solution if all of the jobs you run on the cluster need to be limited, or if you could do this to some fraction of the cluster then put
these nodes in a node group so that particular jobs could use them. This is probably the least desireable solution.
