Artifactual Communication
Accesses not satisfied in local portion of memory hierachy cause communication
- Inherent communication, implicit or explicit, causes transfers
- Artifactual communication
- determined by program implementation and arch. interactions
- poor allocation of data across distributed memories
- unnecessary data in a transfer
- unnecessary transfers due to system granularities
- redundant communication of data
- finite replication capacity (in cache or main memory)
- Inherent communication assumes unlimited capacity, small transfers, perfect knowledge of what is needed.