Let's consider a scenario like below:
A small web blog build based on LAMP stack and deployed on a shared hosting. Suddenly it becomes popular in one day and it gets million hits per day. Since the developer have not consider high traffic, it caused server downtime and crashes.
What would be a quick fix for such a scenario?
BTW I know on cloud Servers I may be able to add more RAM or CPU to avoid that like in Amazon EC2.
Is there any way to see what process(es) caused the most CPU usage?
I have AMAZON EC2 Linux which CPU utilization reaches 100 percent and make me to reboot the system. I cannot even login through SSH (Using putty).
Is there any way to see what causes such a high CPU usage and which process caused that ?
I know about sar and top command but I could not find process execution history anywhere. Here is the image from Amazon EC2 monitoring tool, but I would like to know which process caused that :
I have also tried ps -eo pcpu,args | sort -k 1 -r | head -100 but no luck finding such a high CPU usage.