Re: Max open file limit

[Rajat Sharma <fs.rajat@xxxxxxxxx>]

Well this is not really a limit on number of files, rather a memory allocation optimization for fd_array. The limit you are looking for is:

int sysctl_nr_open __read_mostly = 1024*1024;

$ cat /proc/sys/fs/nr_open 
1048576

-Rajat

On Wed, Dec 5, 2012 at 4:38 PM, Vijay Chauhan <kernel.vijay@xxxxxxxxx> wrote:

Hello,

How many files a process can open at a time? Is it configurable?

I found following in the kernel code:

..
  .max_fds        = NR_OPEN_DEFAULT,
..
..
#define NR_OPEN_DEFAULT BITS_PER_LONG
..
..
#ifdef __KERNEL__
#define BITS_PER_LONG 32
..

But I can open more than 32 files in my user space program.

Thank you,
Vijay

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