Abstraction of Multi Tier Architectures

• 1: Client Tier running on PC or Workstations

• 2: Middle Tier -- a growing sea of (application) servers where most Intranet software activity is concentrated

  • Contains business logic
  • Modest Performance High Functionality
  • Software architecture reflects Macroscopic loosely coupled structure of problems

• 3: Back end Capabilities such as MPP’s

  • Good use requires understanding microscopic tightly coupled parallel structure of applications

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