C++ Debugging Guide

Author: Muhammad F. Kasim

Inspecting Segmentation Fault

Requirements

• gdb

Steps

• Compile with -g flag
• Type in the terminal:

gdb ./executable

• In the gdb window, type:

r
bt

Detect false sharing on Linux

Requirements

• perf

Steps

• Turn on the OpenMP parallelization by adding flag -fopenmp
• Compile with -g flag
• Type in the terminal:

sudo perf c2c record ./executable
sudo perf c2c report -i perf.data

Detect memory leaks on Linux

Requirements

• valgrind

Steps

• Compile with -g flag
• Type in the terminal:

valgrind --leak-check=full --undef-value-errors=no -v ./executable

• valgrind will report the memory leaks in the stdout

Speed performance profiling

Requirements

• gprof (usually installed with gcc)

Steps

• Compile with flags -g -pg -no-pie
• Type in the terminal:

./executable
gprof ./executable gmon.out > analysis.test
less analysis.test