CPU Usage : Top and mpstat shows different results
By Daniel Johnston
top
%Cpu(s): 10.9 us, 3.1 sy, 0.0 ni, 85.2 id, 0.2 wa, 0.0 hi, 0.7 si, 0.0 st
31426 www-data 20 0 309088 21276 14600 S 22.3 0.1 0:07.36 php-fpm: pool www
31431 www-data 20 0 308980 21232 14568 S 22.3 0.1 0:01.69 php-fpm: pool www
31423 www-data 20 0 308992 21376 14664 S 21.6 0.1 0:08.38 php-fpm: pool www
31437 www-data 20 0 308988 21224 14568 R 20.9 0.1 0:00.66 php-fpm: pool wwwand mpstat
04:05:29 PM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
04:05:29 PM all 1.06 0.00 0.29 0.02 0.00 0.06 0.00 0.00 0.00 98.57
04:05:29 PM 0 0.81 0.00 0.32 0.03 0.00 0.00 0.00 0.00 0.00 98.84
04:05:29 PM 1 1.40 0.00 0.37 0.02 0.00 0.07 0.00 0.00 0.00 98.14
04:05:29 PM 2 1.39 0.00 0.36 0.02 0.00 0.07 0.00 0.00 0.00 98.16
04:05:29 PM 3 1.35 0.00 0.35 0.02 0.00 0.07 0.00 0.00 0.00 98.21
04:05:29 PM 4 0.98 0.00 0.25 0.01 0.00 0.08 0.00 0.00 0.00 98.68
04:05:29 PM 5 0.86 0.00 0.22 0.01 0.00 0.06 0.00 0.00 0.00 98.85
04:05:29 PM 6 0.81 0.00 0.21 0.02 0.00 0.06 0.00 0.00 0.00 98.90
04:05:29 PM 7 0.87 0.00 0.22 0.02 0.00 0.06 0.00 0.00 0.00 98.83Is the server overloaded already?
42 Answers
top:
100% means 1 CPU is fully used. So what you see for php-fpm is 87.1% of one CPU out of 8 i.e. less than 11% of your total CPU power.
mpstat:
If you do not give an interval to mpstat it gives you the average CPU utilization since startup. mpstat -P ALL 2 5 gives you five results of 2-second-intervals.
Not at 85.2% idle. By default, top displays a single cpu. Press "1" to display a breakdown of CPU usage per CPU.
