Troubleshooting High Load on LAMP server

[hadoanngoc]

Hi,

(Don't know if this question is in appropriate forum. Moderator pls move to the correct one if needed)

I'm running a WordPress site on an LAMP server, with 4 CPUs. My server regularly encounters high load average. Please see this screenshot

http://prntscr.com/bkc6k0

CPU is mostly idle. Number of process is not too high (I think). Mem + Swap are still available. What else could be the reason for the high load? I'm desperate in finding the cause!

Thanks and advance

 

[Petertjuh360]

Your load is defined by the usage of your CPU's.

If you have 4 CPU cores and your load is 2.0, it means that 2 CPU cores are running at 100%. If your load is 4.0 is means all 4 cores are running on 100%. If your load is 1.5, 1 core is running on 100% and another core on 50%.

If your load is above the number of CPU cores, there will be a delay in processes.

Could you do this (if you are running CentOS)?
yum install epel-release -y
yum install htop -y
htop

And show a print screen, please?