GNU gprof review
A free, focused choice for function timing and call-graph analysis in C and C++.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
GNU gprof is a command-line profiler in the GNU Binutils project for developers analyzing compiled C and C++ programs. It requires programs to be compiled and linked with profiling enabled, then run to generate profile data for analysis. The tool is suited to users who want function-level execution timing, caller and callee relationships, source annotations, and execution counts without adopting a broader profiling platform.
Its main strength is the breadth of analysis within a focused command-line workflow. GNU gprof provides flat profiling by function, call-graph analysis, annotated source listings, line-by-line profiling, and basic-block execution counts. It also supports static call-graph heuristics, C++ symbol demangling, and merging multiple profile data files. These capabilities make it useful for examining where execution time is spent and how calls move through a program. As free and open-source software, it is accessible for projects that need core CPU profiling without a paid tier.
The tradeoff is scope. GNU gprof is centered on compiled C and C++ programs and does not offer verified memory or thread profiling, while its platform and integration breadth is limited. Developers who need a narrow, text-oriented view of CPU behavior should find its feature set appropriate; teams seeking wider runtime coverage, broader ecosystem integration, or memory and thread analysis should choose a profiler designed for those needs instead. The GNU Binutils project also identifies gprofng as a newer profiler in the same project.
GNU gprof pros and cons
- Where it wins
- Free and open source under the GNU Binutils project
- Combines flat profiles, call graphs, and annotated source output
- Supports C++ symbol demangling and merged profile data files
- Where it doesn't
- Focused on C and C++ rather than broader language coverage
- Does not provide verified memory or thread profiling
- Offers limited platform and integration breadth
GNU gprof fact sheet, pricing and score →
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