CODEWITHSUNDEEP
linuxulimit
Yuri Geinish
Yuri Geinish

Reputation: 17214

The limit of ulimit -Hn

Using trial and error, I've found the maximum number I can give to ulimit -Hn without getting error is 1048576. Where does that number come from? My sys.fs.file-max is 20000500 (20 million).

Upvotes: 3

Views: 2780

Answers (2)

rr-
rr-

Reputation: 14811

Actually, this is hardcoded in Linux kernel, in fs/file.c:

int sysctl_nr_open __read_mostly = 1024*1024;

and is equal to just the number you specified.

Related commits that tried to make it infinite:

Looks like it hasn't been touched ever since.

Upvotes: 4

user5057802
user5057802

Reputation: 56

Actually, this limit can be increased. Set fs.nr_open=5242880 in /etc/sysctl.conf, run sysctl -p and login again. Your limit is now 5 million! Set both this and file-max.

Upvotes: 4

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