Download Performance Tuning of Scientific Applications (Chapman & by David H. Bailey, Robert F. Lucas, Samuel Williams PDF
By David H. Bailey, Robert F. Lucas, Samuel Williams
With contributions from the most striking specialists within the box, functionality Tuning of clinical purposes provides present study in functionality research. The e-book specializes in the next parts. functionality tracking: Describes the cutting-edge in and software program instruments which are ordinary for tracking and measuring functionality and handling huge amounts of information functionality research: Discusses sleek techniques to desktop functionality benchmarking and offers effects that supply worthwhile perception into those reviews functionality modeling: Explains how researchers deduce actual functionality types from uncooked functionality info or from different high-level features of a systematic computation computerized functionality tuning: Explores ongoing examine into computerized and semi-automatic strategies for optimizing laptop courses to accomplish better functionality on any desktop platform software tuning: presents examples that exhibit how the right research of functionality and a few deft alterations have ended in super excessive functionality functionality research has grown right into a full-fledged, refined box of empirical technology. Describing worthy examine in glossy functionality technological know-how and engineering, this publication is helping real-world clients of parallel computers to higher comprehend either the functionality vagaries coming up in medical functions and the sensible capacity for bettering functionality. examine the e-book on HPCwire and insideHPC
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Additional info for Performance Tuning of Scientific Applications (Chapman & Hall CRC Computational Science)
Example text
3 Determinism . . . . . . . . . . . . . . . . . . . . . . . Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Acknowledgment . . . . . . . . . . . . . . . . . . . . . . . . . 1 Introduction 47 48 48 48 Hardware performance counters are registers available on modern CPUs that count low-level events within the processor with minimal overhead. Hardware counters may also exist on other system components, such as memory controllers and network interfaces.
3 IBM Blue Gene . . . . . . . . . . . . . . . . . . . . . Operating System Interfaces . . . . . . . . . . . . . . . . . . . 1 Perf Events . . . . . . . . . . . . . . . . . . . . . . . 2 Perfmon2 . . . . . . . . . . . . . . . . . . . . . . . . 3 Oprofile . . . . . . . . . . . . . . . . . . . . . . . . . PAPI in Detail . .
On a counter overflow an interrupt 48 Performance Tuning of Scientific Applications routine interrupts program flow, which can cause timing (and even cache) behavior changes that would not happen if counters were not being used. Also, libraries such as PAPI add a certain amount of overhead each time a routine is called, which can show up in counter results. 3 Determinism It is often expected that if the same program is run twice, the resulting performance results should be the same between runs.