strace apache or process to detect bottlenecks

Sometimes you have a multi threaded / multi processed application and you need to see where are things hanging. ps auxw | grep sbin/apache | awk '{print"-p " $2}' | xargs strace   nJoy 😉

Monitoring a bottleneck with strace

If let’s say Mysql is slow at performing a task you can check what is the bottleneck using strace to attach to the process. <span style="color: #00ff00;">$ ps -ef|grep -i mysql</span> Identify the process id then <span style="color: #00ff00;">$ strace -cp &lt;pid&gt;</span> Leave it 10 seconds or a minute then ^C. That will tell you where…