systcl

sysctl kernel.pid_max

查看pid的最大数字，服务器上的配置时3w多，服务端小伙伴给一个服务开了2w的线程，这个机器就变成下面这样的

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-bash: fork: Cannot allocate memory
-bash-4.2# 
-bash-4.2# 
-bash-4.2# 
-bash-4.2# ls
-bash: fork: Cannot allocate memory
-bash-4.2# sls
-bash: fork: Cannot allocate memory
-bash-4.2# ls
-bash: fork: Cannot allocate memory

　　

查看这个进程打开的线程数

ps -eLf |grep pid| wc -l

 

修改最大进程数
echo 100000 > /proc/sys/kernel/pid_max

永久生效
echo "kernel.pid_max=100000 " >> /etc/sysctl.conf
sysctl -p