Turbocharged awk
In a previous article, I covered the basics of awk and presented a small application to reformat address book data. Now, I'll show you how to turbocharge awk. You can improve the performance of your awk programs by uncovering bottlenecks in your code with the help of a profiler, hunting for bugs with XREF, and using Awka to increase speed.
If your awk program isn't running at an acceptable speed, the first thing to do is look for a logic error. You may have created a loop that is executing more often than it should or processing a set of records more than once. The GNU version of awk includes a profiler -- usually found in /bin/pgawk -- to help you find these kinds of programming bugs.
To use the profiler, call pgawk instead of gawk when running your program, or use the --profile option with gawk. By default, the profiler creates a file in the current directory called awkprof.out, which contains a copy of the program with execution counts for each statement in the left margin. For example:
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