June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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Poor man's profiler
You can profile an application just by using GDB to stop it at arbitrary intervals to see what it is doing. This is the poor man's profiler. It is easy to set up and is one way of gathering profile data.
The procedure is simple:
- Attach to the process using gdbserver (for a remote debug) or GDB (for a native debug). The process stops.
- Observe the function it stopped in. You can use the backtrace GDB command to see the call stack.
- Type continue so that the program resumes.
- After a while, type Ctrl + C to stop it again, and go back to step 2.
If you repeat steps 2 to 4 several times, you will quickly get an idea of whether it is looping or making progress, and if you repeat them often enough, you will get an idea of where ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.