====== Strace ======

= STRACE - Traces System Calls and Signals =

Strace is used for debugging process etc. which may be causing high CPU usage etc. which may be identified using "top" and/or "ps -eaf" etc.

Problem: A particular process is eating/using up CPU time. There are no logs from the process/program itself and you need to find out what is causing the bottleneck/problem.

Step 1: Find the PID (process id)
 ps -eaf | grep process
 <nowiki>//</nowiki> or
 pgrep process

Step 2: Run strace and attach to process.
 strace -fp processID
 <nowiki>//</nowiki> f = trace child processes as they are forked
 <nowiki>//</nowiki> p = attach to processID
 
 strace -fp processID -o outputfile
 
 strace -fp processID -o outputfile -r
 <nowiki>//</nowiki> appends a timestamp to each line of output.

I hope you solve your problem. Issues you may find -> Files not existing, Cannot read/write to files. Repeated connection attempts by users etc.

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More info at:
http://www.debian-administration.org/articles/352