Handling of E16- Cannot allocate memory problem

solve:

View the maximum number of processes sysctl kernel.pid_max

View the number of processes: ps-ef |wc -l 

After modifying the maximum number of processes, system recovery
echo 1000000 > /proc/sys/kernel/pid_max

takes effect permanently
echo "kernel.pid_max=1000000 " >> /etc/sysctl.conf
sysctl -p