Performance Modeling

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Table of Contents

Performance Modeling

Latency and Bandwidth

Interpreting Latency and Bandwidth

Including Contention

Synchronization Delays

Polling Mode MPI

Interrupt Mode MPI

Example of the effect of Polling

Observing Synchronization Delays

Other Impacts on Performance

Contention

Effect of contention

Memory copies

Example: Performance Impact of Memory Copies

Example: Why MPI Datatypes

Performance of MPI Datatypes

Packet sizes

Example of Packetization

Author: William D Gropp

Email: gropp@mcs.anl.gov

Home Page: http://www.mcs.anl.gov/~gropp

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