Dr. Dobb's Journal - June 2008 - (Page 43) d06keas_p4ds 4/10/08 1:48 PM Page 43 divergence of up to 26 percent when using exactly the same compiler, data layouts, and compiler options. This fact only becomes evident when compiling on two different machines. This example reveals a key advantage of flexible data structures. The ability to switch data structures lets you catch performance problems related to data layout that may not be obvious through profiling tools. The spikes in some of the graphs show clear performance problems for some configurations, but a profiler may not catch that effect because the usage of a given data structure may be spread uniformly throughout the code. STL versus Naked Pointers I initially ran the benchmarks for this article using STL vectors to store data, but was curious how the STL performance compared to using naked pointers. Listing Five (available online) uses the restrict keyword with pointers in place of STL vectors. In Figures 5, 6, and 7, I plot the ratio of the Pointer time to the STL time for the Triangle, Quadrilateral, and Brick benchmarks, respectively (a value less than 1 means the naked pointers are faster). The Quadrilateral benchmark results show that the pathscale 3.0 compiler on the Opteron ran 32 percent faster on average when using Figure 3: Point class/Quadrilateral class. Figure 4: Point class/Brick class. Download a proven, cross-platform database alternative • Unmatched performance in enterprise systems, desktop deployments, and embedded devices for over 25 years. • Simplified framework for rapid development of data-driven applications including graphical tools to speed your development and monitor critical metrics of the database engine. • Free development and free deployment in non-commercial environments. • Flexibility to use ISAM and SQL API’s within the same application. • Sophisticated feature set including 64-bit support, memory files, ADO.NET, LINQ, C#, VCL, and dbExpress. • Cross Platform support including Windows, UNIX, Linux, Mac OS X, and more. • OEM Database Engine simplifies your deployment with a single executable and flexible licensing options. Prove it to yourself in six minutes. Download today! www.faircom.com June 2008 l www.ddj.com l Dr. Dobb’s Journal 43 http://www.faircom.com http://www.faircom.com http://www.ddj.com
Table of Contents Feed for the Digital Edition of Dr. Dobb's Journal - June 2008 Dr. Dobb's Journal - June 2008 Contents Friday Night Fish Fry Alia Vox Developer Diaries There Must Be Contest Conversations Building a Test Harness for RTOS QT and Windows CE Software to Hardware Parallelization Performance Portable C++ Effective Concurrency The Agile Edge Swaine's Flames Dr. Dobb's Journal - June 2008 Dr. Dobb's Journal - June 2008 - Dr. Dobb's Journal - June 2008 (Page Cover1) Dr. Dobb's Journal - June 2008 - Dr. Dobb's Journal - June 2008 (Page Cover2) Dr. Dobb's Journal - June 2008 - Dr. Dobb's Journal - June 2008 (Page 1) Dr. Dobb's Journal - June 2008 - Dr. Dobb's Journal - June 2008 (Page 2) Dr. Dobb's Journal - June 2008 - Dr. Dobb's Journal - June 2008 (Page 3) Dr. Dobb's Journal - June 2008 - Contents (Page 4) Dr. Dobb's Journal - June 2008 - Contents (Page 5) Dr. Dobb's Journal - June 2008 - Friday Night Fish Fry (Page 6) Dr. Dobb's Journal - June 2008 - Friday Night Fish Fry (Page 7) Dr. Dobb's Journal - June 2008 - Friday Night Fish Fry (Page 8) Dr. Dobb's Journal - June 2008 - Friday Night Fish Fry (Page 9) Dr. Dobb's Journal - June 2008 - Alia Vox (Page 10) Dr. Dobb's Journal - June 2008 - Alia Vox (Page 11) Dr. Dobb's Journal - June 2008 - Alia Vox (Page 12) Dr. Dobb's Journal - June 2008 - Alia Vox (Page 13) Dr. Dobb's Journal - June 2008 - Developer Diaries (Page 14) Dr. Dobb's Journal - June 2008 - Developer Diaries (Page 15) Dr. Dobb's Journal - June 2008 - There Must Be Contest (Page 16) Dr. Dobb's Journal - June 2008 - There Must Be Contest (Page 17) Dr. Dobb's Journal - June 2008 - There Must Be Contest (Page 18) Dr. Dobb's Journal - June 2008 - There Must Be Contest (Page 19) Dr. Dobb's Journal - June 2008 - Conversations (Page 20) Dr. Dobb's Journal - June 2008 - Conversations (Page 21) Dr. Dobb's Journal - June 2008 - Building a Test Harness for RTOS (Page 22) Dr. Dobb's Journal - June 2008 - Building a Test Harness for RTOS (Page 23) Dr. Dobb's Journal - June 2008 - Building a Test Harness for RTOS (Page 24) Dr. Dobb's Journal - June 2008 - Building a Test Harness for RTOS (Page IBM-1) Dr. Dobb's Journal - June 2008 - Building a Test Harness for RTOS (Page IMB-2) Dr. Dobb's Journal - June 2008 - Building a Test Harness for RTOS (Page 25) Dr. Dobb's Journal - June 2008 - Building a Test Harness for RTOS (Page 26) Dr. Dobb's Journal - June 2008 - Building a Test Harness for RTOS (Page 27) Dr. Dobb's Journal - June 2008 - Building a Test Harness for RTOS (Page 28) Dr. Dobb's Journal - June 2008 - Building a Test Harness for RTOS (Page 29) Dr. Dobb's Journal - June 2008 - QT and Windows CE (Page 30) Dr. Dobb's Journal - June 2008 - QT and Windows CE (Page 31) Dr. Dobb's Journal - June 2008 - QT and Windows CE (Page 32) Dr. Dobb's Journal - June 2008 - QT and Windows CE (Page 33) Dr. Dobb's Journal - June 2008 - QT and Windows CE (Page 34) Dr. Dobb's Journal - June 2008 - QT and Windows CE (Page 35) Dr. Dobb's Journal - June 2008 - Software to Hardware Parallelization (Page 36) Dr. Dobb's Journal - June 2008 - Software to Hardware Parallelization (Page 37) Dr. Dobb's Journal - June 2008 - Software to Hardware Parallelization (Page 38) Dr. Dobb's Journal - June 2008 - Software to Hardware Parallelization (Page 39) Dr. Dobb's Journal - June 2008 - Performance Portable C++ (Page 40) Dr. Dobb's Journal - June 2008 - Performance Portable C++ (Page 41) Dr. Dobb's Journal - June 2008 - Performance Portable C++ (Page 42) Dr. Dobb's Journal - June 2008 - Performance Portable C++ (Page 43) Dr. Dobb's Journal - June 2008 - Performance Portable C++ (Page 44) Dr. Dobb's Journal - June 2008 - Performance Portable C++ (Page 45) Dr. Dobb's Journal - June 2008 - Performance Portable C++ (Page 46) Dr. Dobb's Journal - June 2008 - Performance Portable C++ (Page 47) Dr. Dobb's Journal - June 2008 - Effective Concurrency (Page 48) Dr. Dobb's Journal - June 2008 - Effective Concurrency (Page 49) Dr. Dobb's Journal - June 2008 - Effective Concurrency (Page 50) Dr. Dobb's Journal - June 2008 - Effective Concurrency (Page 51) Dr. Dobb's Journal - June 2008 - The Agile Edge (Page 52) Dr. Dobb's Journal - June 2008 - The Agile Edge (Page 53) Dr. Dobb's Journal - June 2008 - The Agile Edge (Page 54) Dr. Dobb's Journal - June 2008 - The Agile Edge (Page 55) Dr. Dobb's Journal - June 2008 - Swaine's Flames (Page 56) Dr. Dobb's Journal - June 2008 - Swaine's Flames (Page Cover3) Dr. Dobb's Journal - June 2008 - Swaine's Flames (Page Cover4)
For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.