Debugging - finding and fixing errors or bugs

1. OS has a log file, which stores error information

2. In the case of Application failure, a core dump file is made, storing the memory of the process

3. In the case of Kernel failure, a cache dump file is made, storing the memory of the kernal

Performance Tuning

Optimise the performance of a program

How

1. Tracing Listing, use for analysis

2. Profiling is when you look at a pointer and look for trends

To look for

• Bottlenecks - do this by looking at system operations

Tracing

Example of a tracing tool with linux is 'BCC'

• strace – trace system calls invoked by a process

• gdb – source-level debugger

• valgrind – detect many memory management and threading bugs

• perf – collection of Linux performance tools

• tcpdump – collects network packets