The slurmjobvis command launches a GUI that shows the realtime utlilization of cores and memory on nodes for a job.  It requires X-Display to be enabled when logging in to the cluster front-end machine.

slurmjobvis jobid <cluster>

The blue bar indicates user process activity on the core.  Red indicates system activity on the core.  The Yellow and green bar shows the memory usage.  Mouse over the bars to show utilization percentages.

Additional tools for monitoring jobs can be found in this knowledge base article