Article Preview
Buy Now
| Print: | |
| PDF: |
Optimizing REALbasic
Optimizing REALbasic
Optimizing with Stock Replacements
Issue: 4.3 (January/February 2006)
Author: Hank Marquis
Article Description: No description available.
Article Length (in bytes): 10,783
Starting Page Number: 40
RBD Number: 4319
Resource File(s): None
Related Web Link(s):
http://www.extremeoptimizing.com
http://www.slayfire.com
http://www.itl.nist.gov/div898/handbook/prc/section1/prc13.htm
http://davidmlane.com/hyperstat/A28521.html
http://www.its.bldrdoc.gov/fs-1037/dir-001/_0125.htm
Known Limitations: None
Excerpt of article text...
To optimize performance you must have a way of comparing two code blocks to see which method is faster. This article is part one of a three part series in which we will create a measuring system that provides statistically valid performance data. The "test harness" we build will be accurate, precise, and yield repeatable values about which you may feel confident.
The best way to explain how to compare code execution speed is by describing the incorrect method so many developers think they can use for optimization -- the Microseconds keyword. Many developers think optimization is as simple as follows:
Save Microseconds current value (Start)
Doing something interesting
Save Microseconds current value (Stop)
Subtract the Start from the Stop to get the Elapsed time
Listing 1 shows some code implementing the above (flawed) logic.
Listing 1: (How Not To) Time Code Excution
Function Foo(lb As ListBox) As Double
Dim i As Integer
Dim r As Integer
Dim dStart As Double
Dim dStop As Double
...End of Excerpt. Please purchase the magazine to read the full article.
Article copyrighted by REALbasic Developer magazine. All rights reserved.
|
