Lecture 9

Learning objectives

After this class, you should be able to:

1. Optimize program performance by making effective use of compiler flags and feedback optimization.
2. Optimize program performance by making effective use standard libraries.

Reading assignment

1. Read the code under the Lec9 and ps3/spu directory on linprog.

Exercises and review questions

• Exercises and review questions on current lecture's material

  1. Use a variety of optimization flags discussed in class and determine a good set of flags for the MM.c code..

  2. Use the cblas library of ATLAS to perform matrix-vector multiplication, and determine performance as a function of matrix size. See the makefile and MMBLAS.c files for examples of compilation and use of CBLAS. Also read the CBLAS reference on blackboard, under the course library tab.

• Preparation for the next lecture
  1. Determine the time taken to run MMBLAS using /usr/bin/time.

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Last modified: 9 Feb 2010