I have been using GPT at work since 2007 and I am completely satisfied. I use it to monitor and optimize the Linux network library, and I got significant results.
The main disadvantage of GPT is the lack of accuracy. Thanks to the design, you only have the basic functions that require a lot of time, but this is often necessary when you want to optimize the program.
To be more precise, I recommend using other tools like gprof or IBM Quantify.
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