各プロセスのCPU使用率をはかる

on
7/08/2019

less /proc/***

To calculate CPU usage for a specific process you'll need the following:
/proc/uptime
#1 uptime of the system (seconds)
/proc/[PID]/stat
#14 utime - CPU time spent in user code, measured in clock ticks
#15 stime - CPU time spent in kernel code, measured in clock ticks
#16 cutime - Waited-for children's CPU time spent in user code (in clock ticks)
#17 cstime - Waited-for children's CPU time spent in kernel code (in clock ticks)
#22 starttime - Time when the process started, measured in clock ticks
Hertz (number of clock ticks per second) of your system.
In most cases, getconf CLK_TCK can be used to return the number of clock ticks.
The sysconf(_SC_CLK_TCK) C function call may also be used to return the hertz value.
Calculation
First we determine the total time spent for the process:
total_time = utime + stime
We also have to decide whether we want to include the time from children processes. If we do, then we add those values to total_time:
total_time = total_time + cutime + cstime
Next we get the total elapsed time in seconds since the process started:
seconds = uptime - (starttime / Hertz)
Finally we calculate the CPU usage percentage:
cpu_usage = 100 * ((total_time / Hertz) / seconds)
cat /proc/loadavg
cat /proc/meminfo

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