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本文来自工作实战,xx地方线上系统今年jvm cpu100%好几次,给了运维同学一个bat脚本需要在cpu100%的时候,手动执行去dump thread提取线索,每次cpu100%的时候影响范围很大,运维同学很紧张赶快重启服务,导致提取不到线索。这种方式很原始与倡导自动化运维的今天格格不入。
方法总是有的,并且很简单,动动脑筋点子就有了:程序自动检测当cpu超过90%自动dump thread
生命苦短我用python
包含空格才27行
# psutil 模块 用于监控:
# 安装 pip install psutil
# 打包 pyinstaller -F threaddumptool.py
import psutil
import time
import subprocess
# 监控cpu信息:
def cpu():
cpu = psutil.cpu_count(False) # cpu核数 默认逻辑cpu核数,False查看真实cpu核数;
cpu_per = int(psutil.cpu_percent(2)) # 每秒cpu使用率,(1,True) 每一核cpu的每秒使用率;
# print(cpu_per)
return cpu_per
def dump(count):
for proc in psutil.process_iter(['pid', 'name']):
if 'java' in proc.info['name']:
print(proc.info)
psexecPath = 'D:\PSTools\psexec'
jdkPath = 'D:/work/software/Java/jdk1.8.0_25/bin/jstack.exe'
print(psexecPath+' -s '+jdkPath+' -l %s > d:/threaddump%s_%d.txt'% (proc.info['pid'], proc.info['pid'],count))
subprocess.Popen(psexecPath+' -s '+jdkPath+' -l %s > d:/threaddump%s_%d.txt' % (proc.info['pid'], proc.info['pid'],count), shell=True)
# subprocess.Popen('jstack %s > d:/threaddump%s_%d.txt' % (proc.info['pid'], proc.info['pid'],count), shell=True)
# subprocess.Popen('jrcmd %s print_threads > d:/threaddump%s.txt' % (proc.info['pid'], proc.info['pid']), shell=True)
# psexec -s D:\work\software\Java\jdk1.8.0_25\bin\jstack.exe -l %s > d:/threaddump%s.txt
def main():
timer(1)
def timer(n):
fileCount = 0
while True:
cpu_info = cpu()
print("cpu占用%s"% (cpu_info))
if cpu_info > 60:
fileCount = fileCount + 1
dump(fileCount)
time.sleep(60)
if fileCount > 10:
break
time.sleep(n)
main()
运行脚本
dump的线程部分截图
在项目根目录输入 pyinstaller -F threaddumptool.py
python真的很香,如果您觉得不错请帮忙再看或转发!
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