The percentages are small because a) This is the output of perf top, a system-wide trace of the last few seconds b) The application uses lots of library funct

The percentages are small because a) This is the output of perf top, a system-wide trace of the last few seconds b) The application uses lots of library functions c) Due to lots of locking in the application, the cpu doesn't spend much time in the app itself To find out which high-level functions (that in turn call library functions) take the most time, use perf record to get call stacks.