c# upc-a C++ Example of an Attempt to Tune Code to sum the Elements in a Matrix in C#

Drawer UPC - 13 in C# C++ Example of an Attempt to Tune Code to sum the Elements in a Matrix

C++ Example of an Attempt to Tune Code to sum the Elements in a Matrix
European Article Number 13 Maker In Visual C#.NET
Using Barcode generation for .NET framework Control to generate, create European Article Number 13 image in Visual Studio .NET applications.
www.OnBarcode.com
Recognizing UPC - 13 In Visual C#
Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
sum = 0; elementPointer = matrix; lastElementPointer = matrix[ rowCount - 1 ][ columnCount - 1 ] + 1; while ( elementPointer < lastElementPointer ) { sum = sum + *elementPointer++; }
Print Bar Code In Visual C#.NET
Using Barcode maker for .NET Control to generate, create bar code image in Visual Studio .NET applications.
www.OnBarcode.com
Barcode Recognizer In Visual C#
Using Barcode decoder for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
8 FURTHER READING Jon
Making EAN / UCC - 13 In Visual Studio .NET
Using Barcode generator for ASP.NET Control to generate, create EAN13 image in ASP.NET applications.
www.OnBarcode.com
EAN13 Creation In .NET
Using Barcode creator for Visual Studio .NET Control to generate, create EAN13 image in .NET framework applications.
www.OnBarcode.com
9 Bentley reported a similar
Encoding EAN13 In VB.NET
Using Barcode generator for Visual Studio .NET Control to generate, create EAN / UCC - 13 image in VS .NET applications.
www.OnBarcode.com
Matrix Barcode Creator In Visual C#
Using Barcode maker for Visual Studio .NET Control to generate, create Matrix 2D Barcode image in .NET applications.
www.OnBarcode.com
experience in which converting to pointers hurt perform1 ance by about 10 percent. 2 The same conversion had in 3 another setting improved performance more than 50 percent. See Software Exploratorium: Writing Efficient C Programs (Bentley 1991).
UCC-128 Creator In Visual C#.NET
Using Barcode maker for .NET Control to generate, create UCC.EAN - 128 image in .NET applications.
www.OnBarcode.com
Barcode Creator In Visual C#.NET
Using Barcode encoder for .NET framework Control to generate, create barcode image in VS .NET applications.
www.OnBarcode.com
Even though the code wasn t as readable as the first code, especially to programmers who aren t C++ experts, I was magnificently pleased with myself. For a 100-by-100 matrix, I calculated that I had saved 10,000 multiplications and a lot of loop overhead. I was so pleased that I decided to measure the speed improvement, something I didn t always do back then, so that I could pat myself on the back more quantitatively.
Barcode Encoder In C#
Using Barcode drawer for .NET framework Control to generate, create barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Create EAN - 14 In Visual C#.NET
Using Barcode creation for .NET framework Control to generate, create ITF14 image in .NET framework applications.
www.OnBarcode.com
de Complete
Decoding PDF 417 In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Code 39 Extended Drawer In .NET
Using Barcode encoder for VS .NET Control to generate, create Code 3/9 image in Visual Studio .NET applications.
www.OnBarcode.com
25. Code-Tuning Strategies
Printing Bar Code In VS .NET
Using Barcode creation for .NET framework Control to generate, create barcode image in .NET applications.
www.OnBarcode.com
Code 128A Generator In Objective-C
Using Barcode maker for iPad Control to generate, create USS Code 128 image in iPad applications.
www.OnBarcode.com
Page 20
ANSI/AIM Code 39 Generator In Java
Using Barcode creator for BIRT reports Control to generate, create Code 39 Extended image in BIRT reports applications.
www.OnBarcode.com
EAN-13 Maker In VS .NET
Using Barcode maker for Reporting Service Control to generate, create EAN 13 image in Reporting Service applications.
www.OnBarcode.com
No programmer has ever been able to predict or analyze where performance bottlenecks are without data. No matter where you think it s going, you will be surprised to discover that it is going somewhere else. Joseph M. Newcomer
Encode Code 3/9 In Objective-C
Using Barcode generator for iPad Control to generate, create Code 39 Extended image in iPad applications.
www.OnBarcode.com
Scan GS1 - 13 In VB.NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Do you know what I found No improvement whatsoever. Not with a 100-by-100 matrix. Not with a 10-by10 matrix. Not with any size matrix. I was so disappointed that I dug into the assembly code generated by the compiler to see why my optimization hadn t worked. To my surprise, it turned out that I was not the first programmer who ever needed to iterate through the elements of an array the compiler s optimizer was already converting the array accesses to pointers. I learned that the only result of optimization you can usually be sure of without measuring performance is that you ve made your code harder to read. If it s not worth measuring to know that it s more efficient, it s not worth sacrificing clarity for a performance gamble.
Measurements Need to be Precise
Performance measurements need to be precise. Timing your program with a stopwatch or by counting one elephant, two elephant, three elephant isn t precise enough. Profiling tools are useful, or you can use your system s clock and routines that record the elapsed times for computing operations. Whether you use someone else s tool or write your own code to make the measurements, make sure that you re measuring only the execution time of the code you re tuning. Use the number of CPU clock ticks allocated to your program rather than the time of day. Otherwise, when the system switches from your program to another program, one of your routines will be penalized for the time spent executing another program. Likewise, try to factor out measurement overhead so that neither the original code nor the tuning attempt is unfairly penalized.
For a discussion of profiling 7 tools, see Code Tuning in 8 Section 30.3.
6 CROSS-REFERENCE
25.5 Iteration
Once you ve identified a performance bottleneck, you ll be amazed at how much you can improve performance by code tuning. You ll rarely get a 10-fold improvement from one technique, but you can effectively combine techniques; so keep trying, even after you find one that works. I once wrote a software implementation of the Data Encryption Standard, or DES. Actually, I didn t write it once I wrote it about 30 times. Encryption according to DES encodes digital data so that it can t be unscrambled without a password. The encryption algorithm is so convoluted that it seems like it s been used on itself. The performance goal for my DES implementation was to encrypt an 18K file in 37 seconds on an original IBM PC. My first implementation executed in 21 minutes and 40 seconds, so I had a long row to hoe.
Copyright © OnBarcode.com . All rights reserved.