Linux Setup System ulimit

When using Linux as a service runtime environment, there are some performance bottlenecks, because the system defaults to a lower value, typically 1024, it is easy to cause insufficient resources, cannot create a process, or cannot open a file.

First, use Ulimit-a to view system Ulimit settings

ulimit -acore file size           (blocks,  -C)  0data seg size            ( kbytes, -d)  unlimitedscheduling priority               (-E)  0file size                 (blocks, -f)  unlimitedpending signals                   (-i)  127438max locked  memory        (kbytes, -l)  unlimitedmax memory  size          (kbytes, -m)  unlimitedopen files                         (-N)  1048576pipe size             (512 bytes,  -P)  8POSIX message queues      (bytes, -q)   819200real-time priority                (-R)  0stack size                (kbytes, -s)  10240cpu time                 (SECONDS, -T)  unlimitedmax user processes                (-u)  10240virtual memory            (KBYTES, -V)  unlimitedfile locks                         (-X)  unlimited

Second, the parameter meaning

-N is the number of file handles, representing the number of files that the program can open, by default 1024

-u user maximum number of threads, default is 1024

Third, modify the configuration

Method One: Ulimit-n 102400

This method is valid only for the current terminal and will be restored after re-login or reboot

Method Two: Write the configuration to the configuration file ~/.BASHRC or/etc/profile

Method Three: Modify the configuration (recommended)

1, modify the Ulimit-n

vi/etc/security/limits.conf* soft nofile 1048576* hard Nofile 10485 76

2, modify the Ulimit-u

vi/etc/security/limits.d/90-nproc.conf# Default limit for number of user ' s processes to prevent# accidental fork bombs.# See Rhbz #432903 for reasoning.* soft nproc 40960root Soft Nproc Unlimited

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Linux Setup System ulimit