Distributed and Parallel Systems

Distributed

systems

hetero-

geneous

Massively

parallel

systems

homo-

geneous

Legion\Globus

Beowulf

Berkley NOW

Cplant?

Internet

ASCI Red

Tflops

• Gather (unused) resources

• Steal cycles

• System SW manages resources

• System SW adds value

• 10% - 20% overhead is OK

• Resources drive applications

• Time to completion is not critical

• Time-shared

• Bounded set of resources

• Apps grow to consume all cycles

• Application manages resources

• System SW gets in the way

• 5% overhead is maximum

• Apps drive purchase of equipment

• Real-time constraints

• Space-shared

SETI@home

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