Friday Jun 08, 2007

New Article: Performance Tuning with Sun Studio and Inline Assembly Code

 There's a new article on the SDN Sun Studio portal:



Performance Tuning With Sun Studio Compilers and Inline Assembly Code


By Timothy Jacobson, Sun Microsystems, June 2007  
For developers who need faster performance out of C, C++, or Fortran programs, Sun Studio compilers provide several efficient methods. Performance tuning has always been a difficult task requiring extensive knowledge of the machine architecture and instructions. To make this process easier, the Sun Studio C, C++, and Fortran compilers provide easy-to-use performance flags.

By using performance flags, developers can quickly improve execution speed. However, sometimes compiler flags alone do not result in optimum performance. For this reason, Sun Studio compilers also allow inline assembly code to be placed in critical areas. The inline code behaves similarly to a function or subroutine call, which enables cleaner, more readable code and also enables variables to be directly accessed in the inline assembly code.

This paper provides a demonstration of how to measure the performance of a critical piece of code. An example using a compiler flag and another example using inline assembly code are provided. The results are compared to show the benefits and differences of each approach.

Contents

Introduction

For demonstration purposes, this paper uses an academic program to generate the Mandelbrot set. The example Mandelbrot program is written in C. Computing all the pixel values of the Mandelbrot set using the Sun Studio compiler is timed. Then, optimization flags are used and the computations are timed again. Finally, example Sun Studio inline assembly code is used and the computations are timed again and compared with the previous timings. The examples demonstrate two different methods for improving performance with the Sun Studio compiler: using flags and using inline assembly code.

THE REST OF THE ARTICLE IS ON THE SUN STUDIO SDN PORTAL 

 

About

Application development on Solaris OS

Search

Archives
« July 2014
SunMonTueWedThuFriSat
  
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
  
       
Today