理解Linux中文件句柄数量限制file description

问题描述

程序中需要打开很多文件句柄，Linux有没有数量限制呢？

In Linux, you can change the maximum amount of open files.

Find Linux Open File Limit

The value is stored in :

$ cat /proc/sys/fs/file-max

Check Hard/Soft Limit in Linux

$ ulimit -Hn $ ulimit -Sn

Check System wide File Descriptors Limits in Linux

Global limits

sysctl is used to configure kernel parameters at runtime

# To increase open file limit to 500000, the change remain active until the next reboot $ sysctl -w fs.file-max=500000 # apply them permanently $ vi /etc/sysctl.conf # add the following line fs.file-max=500000 # Users will need to logout and login again for the changes to take effect, if you want to apply the limit immediately, you can use: $ sysctl -p

User limits

$ vi /etc/security/limits.conf # <domain> <type> <item> <value> # example marin hard nofile 4096 marin soft nofile 1024

References

How to Increase Number of Open Files Limit in Linux