The Art of Profiling Using Intel VTune Amplifier, Part 8 (Final)

Part 1, Part 2, and Part 3 of this series provided an introduction to profiling and showed how to setup VTune. The first optimization was discussed in Part 4, in which the number of times printf is executed is reduced. The second optimization was discussed in Part 5, in which strlen got replaced with a much cheaper alternative. The third optimization was discussed in Part 6, in which the amount of computation required to report progress is reduced. The third optimization was discussed in Part 7, in which the function do_pswd was inlined into its caller. The following chart shows by how much each optimization improved password cracking throughput. Continue reading

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The Art of Profiling Using Intel VTune Amplifier, Part 7

Previous parts of this series can be found at the following links: Part 1, Part 2, Part 3, Part 4, Part 5, and Part 6.

In Part 6, execution time was improved by 14% and the password cracking throughput became around 150 million passwords per second. Recall from Part 1 that the baseline throughput was around 3 million passwords per second. We have come a long way and we can still do more with the help of VTune. Continue reading