Why is the swarm process so fragmented? (fails to important and doesnt give any error)

When building lighting the processes of lightmass look totally fragmented and doesn’t properly work…The lightmass process doesn’t actually stop though, it reaches 100% but then the new lightmaps don’t import or anything…the engine just acts like nothing happened, and then breaks precomputed visibility. The log doesn’t seem to provide any information that I can understand as to why it reaches 100% but doesn’t actually do anything. 32GB, High spec xeon CPU. Does every single agent need a large amount of ram, or does just the computer that kicks off the swarm need it?