Python监控进程性能数据并绘图保存为PDF文档

引言

利用psutil模块（https://pypi.python.org/pypi/psutil/），能够非常方便的监控系统的CPU、内存、磁盘IO、网络带宽等性能参数，以下是否代码为监控某个特定程序的CPU资源消耗，打印监控数据，最终绘图显示，并且保存为指定的 PDF 文档备份。

示范代码

#!/usr/bin/env python# -*- coding: utf-8 -*-'''Copyright (C)  2015 By Thomas Hu.  All rights reserved.@author : Thomas Hu (thomashtq#163.com)@version: 1.0@created: 2015-7-14'''import matplotlib.pyplot as pltimport psutil as psimport osimport timeimport randomimport collectionsimport argparseclass ProcessMonitor(object):    def __init__(self, key_name, fields, duration, interval):        self.key_name = key_name        self.fields = fields        self.duration = float(duration)        self.inveral = float(interval)        self.CPU_COUNT = ps.cpu_count()        self.MEM_TOTAL = ps.virtual_memory().total / (1024 * 1024)        self.procinfo_dict = collections.defaultdict(dict)    def _get_proc_info(self, pid):        try:            proc = ps.Process(pid)            name = proc.name()            # If not contains the key word, return None            if name.find(self.key_name) == -1:                return None            pinfo = {                    "name": name,                    "pid" : pid,                    }            # If the field is correct, add it to the process information dictionary.            for field in self.fields:                if hasattr(proc, field):                    if field == "cpu_percent":                        pinfo[field] = getattr(proc, field)(interval = 0.1) / self.CPU_COUNT                    elif field == "memory_percent":                        pinfo[field] = getattr(proc, field)() * self.MEM_TOTAL / 100                    else:                        pinfo[field] = getattr(proc, field)()            if pid not in self.procinfo_dict:                self.procinfo_dict[pid] = collections.defaultdict(list)                self.procinfo_dict[pid]["name"] = name            for field in self.fields:                self.procinfo_dict[pid][field].append(pinfo.get(field, 0))            print(pinfo)            return pinfo        except:            pass        return None    def monitor_processes(self):        start = time.time()        while time.time() - start < self.duration:            try:                pids = ps.pids()                for pid in pids:                    self._get_proc_info(pid)            except KeyboardInterrupt:                print("Killed by user keyboard interrupted!")                return    def _get_color(self):        color = "#"        for i in range(3):            a = hex(random.randint(0, 255))[2:]            if len(a) == 1:                a = "0" + a            color += a        return color.upper()    def draw_figure(self, field, pdf):        # Draw each pid line        for pid in self.procinfo_dict:            x = range(len(self.procinfo_dict[pid][field]))            #print x, self.procinfo_dict[pid][field]            plt.plot(x, self.procinfo_dict[pid][field], label = "pid" + str(pid), color = self._get_color())        plt.xlabel(time.strftime("%Y-%m-%d %H:%M:%S"))        plt.ylabel(field.upper())        plt.title(field + " Figure")        plt.legend(loc = "upper left")        plt.grid(True)        plt.savefig(pdf, dpi = 200)        plt.show()def Main():    parser = argparse.ArgumentParser(description='Monitor process CPU and Memory.')    parser.add_argument("-k", dest='key', type=str, default="producer",                    help='the key word of the processes to be monitored(default is "producer")')    parser.add_argument("-d", dest='duration', type=int, default=60,                   help='duration of the monitor to run(unit: seconds, default is 60)')    parser.add_argument('-i', dest='interval', type=float, default=1.0,                   help='interval of the sample(unit: seconds, default is 1.0)')    args = parser.parse_args()    fields = ["cpu_percent", "memory_percent"]    #print args.key, args.duration, args.interval    pm = ProcessMonitor(args.key, fields, args.duration, args.interval)    pm.monitor_processes()    pm.draw_figure("cpu_percent", "cpu.pdf")    pm.draw_figure("memory_percent", "mem.pdf")if __name__ == "__main__":    Main()      

输出结果示范图