Download Code Optimization: Effective Memory Usage by Kris Kaspersky PDF

By Kris Kaspersky

A consultant to optimizing courses at the laptop and Unix systems, this publication covers the expediency of optimization and the the way to elevate the rate of courses through optimization. mentioned are standard blunders made by means of programmers that reduce the functionality of the method besides simply applied suggestions. certain descriptions of the units and mechanism of interplay of the pc elements, powerful methods of programming, and a method for optimizing courses, are supplied. Programmers also will the way to successfully enforce programming equipment in a high-level language that's frequently performed in assembler with specific realization given to the RAM subsystem. The operating rules of the RAM and how within which it really is coupled with the processor in addition to an outline of programming equipment that enables programmers to overclock the reminiscence to arrive greatest functionality are integrated.

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Consequently, accessing it must take only one clock. Has someone discarded this data from cache, or has some conflict occurred? Trying to guess the answer could take forever, because this code isn't causing the problem; it comes from a different branch of the program. Now, it is time to employ one of the most powerful functions of VTune: dynamic analysis. This allows you not only to detect the leak, but also to find the reason behind it. Dynamic analysis isn't carried out on the "live" processor; rather, it is done on its soft emulator.

This increases the loop execution time. Advice Do the following: ♦ Change the sequence of the array dimensions in the array declaration. ♦ Interchange the loop control statements. Result The order in which the array elements are referenced is more sequential. Fewer data cache misses occur, significantly reducing the loop execution time. What? Where are multidimensional loops or cache misses? There is nothing of the sort! Presumably, this is an error by the Coach. ) However, consider the example provided by the Coach.

Calculation of the password length by its duration is comparable to calculation of its CRC. But why do you need to calculate the length of each password? Password checking isn't chaotic. On the contrary, passwords are generated in a strict order. This method increments passwords by one character; but it isn't used frequently. Therefore, perhaps it would be better to delegate this task to the gen_pswd function. Let this 38 Chapter 1: Program Profiling Chapter 1: Program Profiling 39 function determine the length of initial password, then, as the string length is incremented, increment the global variable length by one character.

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