Linux Application Tracing with strace and friends | Into the Terminal 179
Why is your application slow? What is it even doing when you are sitting there with a blinking cursor waiting for it to return? How do you diagnose what a daemon or other service is actually doing? On this episode of Into the Terminal we are going to focus on application tracing. We will use tools like strace, ltrace, time, possibly bcc-tools (ebpf) and more to get more insights into what that application is really doing or, more importantly, what is it spending all it’s time doing on the system, while you are waiting for it to perform it’s function!
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00:00 Using Time Command
02:56 Strace Basics
06:41 Reading Syscalls with Man
08:37 Strace Summary Mode
12:07 Profiling Find Command
15:57 Attaching to Services
16:42 Apache Worker Tracing
23:48 Strace Counts on PID
25:44 Introducing Ltrace
28:21 eBPF and BCC Tools
29:58 BioTop and TCPTOP
33:15 File IO and Disk Mapping
35:20 Language Runtime Tracing