Display CPU and Memory usage

getSysInfo.py

#!/usr/bin/python
import sys
import time

def read_cpu_info():
    with open("/proc/stat", 'r') as f:
        cpu = next(f).split(' ')
        cpu_busy = sum([int(b) for b in cpu[2:5]])
        cpu_total = cpu_busy + int(cpu[5])
    return (cpu_total, cpu_busy)

def get_cpu_percent(t):
    t1, b1 = read_cpu_info()
    time.sleep(t)
    t2, b2 = read_cpu_info()

    if b2 <= b1:
        return 0.0

    try:
        cpu_perc = 100*(b2-b1)/(t2-t1)
    except:
        return 0.0
    else:
        return cpu_perc

def get_memory_percent():
    with open("/proc/meminfo", 'r') as f:
        total = int(next(f).split(' ')[-2])
        next(f)
        available = int(next(f).split(' ')[-2])
    return 100*(1-available/total);

def main():
    if len(sys.argv) > 1:
        t = float(sys.argv[1])
    else:
        t = 0.1

    try:
        cpu_perc = get_cpu_percent(t)
        mem_perc = get_memory_percent()
    except:
        print("Unable to get system info...")
        exit(1)

    print("%3d%%:%3d%%" % (cpu_perc, mem_perc))

if __name__ == '__main__':
    main()

CPU使用率の計測のためのインターバルを引数で指定できる。

$ getSysInfo.py 1 #This is 1 sec.

デフォルトでは 0.1 secになっている。