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How-To

1.error: Too many open files

check by cmd ulimit -a,the result may by like this:

core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
file size               (blocks, -f) unlimited
max locked memory       (kbytes, -l) unlimited
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024

the open files's value is too small,you should change it bigger.

mac:

sudo sysctl -w kern.maxfiles=65536
sudo sysctl -w kern.maxfilesperproc=65536

linux: edit /etc/security/limits.conf,add

* soft nofile 65536
* hard nofile 65536