May 2012
Intermediate to advanced
552 pages
12h 29m
English
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Chapter 9
Tuning Parallel Applications
What's in This Chapter?
Using Amplifier XE to profile a parallel program
The five tuning steps
Using the Intel Software Autotuning Tool
Chapters 6–8 described the first three steps to make your code parallel — analyze, implement, and debug. This chapter discusses the final challenge — tuning your parallel application so that it is load-balanced and runs efficiently.
The chapter begins by describing how to use Amplifier XE to check the concurrency of your parallel program, and then shows how to detect and tune any synchronization problems. The chapter concludes by describing the experimental Intel Software Autotuning Tool (ISAT).
Note that all the screenshots and instructions in this chapter are based on Windows XE; however, you can run the hands-on activities on Linux, as well.
Introduction
Amplifier XE provides two predefined analysis types to help tune your parallel application:
- Concurrency analysis — Use this to find out which logical CPUs are being used, to discover where parallelism is incurring synchronization overhead, and to identify potential candidates for further parallelization.
- Locks and Waits analysis — Use this to identify where your application is waiting on synchronization objects or I/O operations, and to discover how these waits affect your program performance.
In this chapter, you use the Concurrency analysis as the main vehicle for parallel tuning. If your program has a lot of synchronization events, you may find the ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.