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@gmail.com>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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