监控Linux服务器的工具、组件和程序网上有很多，但是一台服务器上会有很多进程同时运行，特别是做性能测试的时候，可能一台服务器上部署多个服务，如果只监控整个服务器的CPU和内存，当某个服务出现性能问题时，并不能有效准确的定位出（当然通过其他工具也可以实现），因此，很有必要只监控指定的进程。需求明确了，于是动手撸了一个性能监控脚本。

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1、为了方便的启动监控和停止监控，在想查看监控结果的时候随时查看监控结果，用flask开启了一个服务，通过发送get请求可以随时启停监控和查看监控结果。
2、针对控制是否监控cpu、内存、IO，开启多线程监控。
3、为了减少对其他组件的依赖，将监控结果写到日志中。
4、为了方便查看监控结果，直接将结果以html方式返回。

二、配置文件

config.py

IP = '127.0.0.1'
PORT = '5555'
LEVEL = 'INFO' # log level
BACKUP_COUNT = 9 # log backup counter
LOG_PATH = 'logs' # log path
INTERVAL = 1 # interval, run command interval.
SLEEPTIME = 3 # interval, when stopping monitor, polling to start monitor when satisfying condition.
ERROR_TIMES = 5 # times, number of running command. When equal, automatically stopped monitor.
IS_JVM_ALERT = True # Whether to alert when the frequency of Full GC is too high.
IS_MONITOR_SYSTEM = True # Whether to monitor system's CPU and Memory.
IS_MEM_ALERT = True # Whether to alert when memory is too low. Alert by sending email.
MIN_MEM = 2  # Minxium memory, uint: G
# 0: don't clear cache, 1: clear page caches, 2: clear dentries and inodes caches, 3: include 1 and 2;
# echo 1 >/proc/sys/vm/drop_caches
ECHO = 0
SMTP_SERVER = 'smtp.sina.com' # SMTP server
SENDER_NAME = '张三'  # sender name
SENDER_EMAIL = 'zhangsan@qq.com' # sender's email
PASSWORD = 'UjBWYVJFZE9RbFpIV1QwOVBUMDlQUT09' # email password, base64 encode.
RECEIVER_NAME = 'baidu_all' # receiver name
RECEIVER_EMAIL = ['zhangsan@qq.com', 'zhangsi@qq.com'] # receiver's email
DISK = 'device1' # Which disk your application runs
START_TIME = 'startTime.txt' # Store the time of start monitoring.
FGC_TIMES = 'FullGC.txt' # Store the time of every FullGC time.
# html
HTML = '{}'
ERROR = '
{}
'
HEADER = '
Performance Monitor (pid={})
'
ANALYSIS = '
{}
'

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