Linux – CPU load too high. How to investigate

cpu-usagelinux

This is my "top" screen. Now it's 2.96. Sometimes it goes above 3! I've read that it's not good. How to investigate and fix it?
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Best Answer

You seem to be seriously using a lot of swap there. You have a relatively small amount of memory allocated to cache/buffers.

Your %wa is at 49.5%. That value corresponds to the CPU waiting for I/O to complete.

I suspect you have that is or was using a large ammount of memory. But perhaps you also have something performing a lot of I/O as well.

Fire up iotop, and you might get a better picture of the I/O situation.

P.S. If you are not using ksplice, then you are almost certainly running a kernel with known vulnerabilities. 354 days of uptime is too long.

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