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Dr. John D. McCalpin

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Background Information

Employment History

Performance Analyst and Computer Architect for Scientific and Engineering Applications, Oceanographer

IBM Corporation


University of Delaware

Principal Scientist



Principle Member of the Technical Staff
Advanced Micro Devices , Inc.

The HPC Challenge Benchmark

College of Marine Studies at the University of Delaware

Founder Inc



Web References (26 Total References)

John McCalpin ... [cached]

John McCalpin

McCalpin Websites and Addresses [cached]

Dr. John D. McCalpin Performance Analyst and Computer Architect for scientific and engineering applications (and former Oceanographer) Texas Advanced Computing Center, University of Texas at Austin

AUTHOR(S):Martin Burtscher, Byoung-Do ... [cached]

AUTHOR(S):Martin Burtscher, Byoung-Do Kim, Jeff Diamond, John McCalpin, Lars Koesterke, James Browne

John McCalpin - University of Texas at Austin

SC2004 - Interactive Schedule [cached]

Piotr Luszczek (UTK), David Koester (MITRE), John McCalpin (IBM), Jeff Vetter (ORNL), Allan Snavely (SDSC), David Nelson (ITRD)

HPC@IDC [cached]

John McCalpin, IBM, discussed simple and composite metrics for system throughput."The question I'm asking is, how simple can you get?How much can you explain with one parameter?Now, what the right second parameter?What's the minimal number of parameters I need?"McCalpin said the number of degrees of parallelism in even the simplest HPC machines creates a huge potential performance range."I used a composite model that makes bytles/flop a simple function of cache size.This revised metric is a much better performance predictor for SPECfp_rate2000."Composite methodology is simple to understand and measure and based on a mathematically correct model, he said.

John McCalpin discussed IBM's "PERCS" initiative for the Phase II program.PERSC stands for productive, easy-to-use, reliable (?) computing systems."This is a set of enhancements to the IBM mainstream product, a dynamic system that adapts to application needs.It combines innovation with commercial viability.McCalpin said PERCS will fold into IBM's mainstream product line in the post-POWER6 timeframe.

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