2. System Model: Distributed System

2.4. Physical model


Physical model
Distributed Systems Early Internet-scale  Contemporary

Scale

 Small Large  Ultra-large
Heterogeneity

Limited (typically relatively 
homogeneous configurations)

Significant in terms of platforms,
languages and middleware

Added dimensions introduced including
radically different styles of architecture
Openness

Not a priority

Significant priority with range of standards introduced

  Major research challenge with existing standards not yet able to embrace complex systems

Quality of Service

Not a priority

Significant priority with range of services introduced

Major research challenge with existing standards not yet able to embrace complex systems