How does python monitor the cpu and memory usage of a specified process

This article introduces how python monitors the cpu and memory utilization of a specified process. The content is very detailed. Interested friends can use it for reference. I hope it will be helpful to you.

To test the stability of a service, you usually need to monitor its resource consumption, such as cpu and memory usage, when the service is running for a long time

Here, with the help of python's psutil package, you can easily monitor the cpu and memory usage of the specified process number (PID).

Code

Process_monitor.py

Import sysimport timeimport psutil# get pid from argsif len (sys.argv)

< 2: print ("missing pid arg") sys.exit()# get processpid = int(sys.argv[1])p = psutil.Process(pid)# monitor process and write data to fileinterval = 3 # polling secondswith open("process_monitor_" + p.name() + '_' + str(pid) + ".csv", "a+") as f: f.write("time,cpu%,mem%\n") # titles while True: current_time = time.strftime('%Y%m%d-%H%M%S',time.localtime(time.time())) cpu_percent = p.cpu_percent() # better set interval second to calculate like: p.cpu_percent(interval=0.5) mem_percent = p.memory_percent() line = current_time + ',' + str(cpu_percent) + ',' + str(mem_percent) print (line) f.write(line + "\n") time.sleep(interval) 支持跨平台linux，windows，mac 根据pid号获取进程实例，固定时间间隔查询其cpu和内存的使用百分比 将监控数据写入文件，一边后续分析 必要的话，也可以额外统计整个机器的资源状况 实例 使用命令 python process_monitor.py 25272 文件保存结果 绘制出曲线图

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