In the screenshot below, the overall CPU is being reported as 3% but the mysqld process is reported as using 57%. Is this 57% of the overall 3% and thus mysqld is only using about 1.5% of the CPU? ...
Some things in top's output are pretty straightforward, like memory and swap usage. But load average numbers are a bit of a mystery: what do these three numbers mean? Also, what exactly is a zombie ...