increasing the number of file descriptors

increasing the number of file descriptors

[rsaura]

      I've recently hit a problem with a httpd process running out of space
      for more fd.

      While I'm seriouly looking for a fd-leak in the php-development
      behind the web server, I realized that i didn't know how to increase
      this parameter.

      Is there any /proc interface for increasing the number of file
      descriptors per process?

      Must I recompile? maybe changes must be made to files_struct?

      I've seen a patch for "variable fd array patch for 2.1.90" from Bill
      Hawes, is there a patch for 2.2.x or 2.4.x kernels?


      Please CC answers to rsaura@retevision.es

      TAI.

          Raúl Saura.



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Re: increasing the number of file descriptors

[Joseph Bueno]

rsaura@retevision.es a écrit :
> 
>       I've recently hit a problem with a httpd process running out of space
>       for more fd.
> 
>       While I'm seriouly looking for a fd-leak in the php-development
>       behind the web server, I realized that i didn't know how to increase
>       this parameter.
> 
>       Is there any /proc interface for increasing the number of file
>       descriptors per process?
> 
>       Must I recompile? maybe changes must be made to files_struct?
> 
>       I've seen a patch for "variable fd array patch for 2.1.90" from Bill
>       Hawes, is there a patch for 2.2.x or 2.4.x kernels?
> 
>       Please CC answers to rsaura@retevision.es
> 
>       TAI.
> 
>           Raúl Saura.
> 
> La información incluida en el presente correo electrónico es CONFIDENCIAL,
> siendo para el uso exclusivo del destinatario arriba mencionado. Si usted
> lee este mensaje y no es el destinatario señalado, el empleado o el agente
> responsable de entregar el mensaje al destinatario, o ha recibido esta
> comunicación por error, le informamos que está totalmente prohibida
> cualquier divulgación, distribución o reproducción de esta comunicación, y
> le rogamos que nos lo notifique, nos devuelva el mensaje original a la
> dirección arriba mencionada y borre el mensaje.
> Gracias.
> 
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Hi,

You can change per process file descriptor limit with ulimit.

If your processes are using a lot of fds you can increase system wide limits
with:
/proc/sys/fs/file-max
/proc/sys/fs/inode-max

Regards
--
Joseph Bueno
NetClub/Trader.com

Re: increasing the number of file descriptors

[Alan Cox]

>       Is there any /proc interface for increasing the number of file
>       descriptors per process?

No. Use rlimi.

>       Must I recompile? maybe changes must be made to files_struct?

Nope. Its all dynamic except for fd_set size, and you should be using poll()
anyway ;)

Re: increasing the number of file descriptors

[aprasad]

 >     While I'm seriouly looking for a fd-leak in the php-development
  >    behind the web server, I realized that i didn't know how to increase
  >    this parameter.

>      Is there any /proc interface for increasing the number of file
 >     descriptors per process?

Yes you can do it in /proc/sys/fs/file-nr

regards,
Anil