MAX_OPEN_FILES - message & changeing

[Peter Polkinghorne]

Nguyen Cao Dat asked about this:

ERROR! Out of file structures - perhaps increase MAX_OPEN_FILES?

As it happens I have started getting them too - on a PC Application server - 
the cause seems to be lots of files needed to be open to run applications - 
Lotus apps seems to be a particular culprit, but experiments indicate that 
even opening help on Microsoft Word opens 13 files!

MAX_OPEN_FILES is a hash define in local.h in the Samba source and can be 
tweeked - this is for 1.9.18p10 - John Blair's Samba book covers this - p72.
Then recompile.

Beware this will if you let it change the default shared memory size - 
SHMEM_SIZE - another define which uses MAX_OPEN_FILES in local.h.  This may 
cause problems since certainly under Solaris shared memory does not vanish on 
the last detach - you have to reboot OR use ipcrm(1) to remove IF you allow 
the size to change.  I changed the define to keep SHMEM_SZIE the same - ie 
made the following diff:

*** local.h.dist        Mon Mar 23 18:31:38 1998
--- local.h     Fri Jan 29 11:39:42 1999
***************
*** 34,44 ****
     MAX_CONNECTIONS services, but any number of machines may connect at
     one time. */
  #define MAX_CONNECTIONS 127
! #define MAX_OPEN_FILES 100
  
  /* Default size of shared memory used for share mode locking */
  #ifndef SHMEM_SIZE
! #define SHMEM_SIZE (1024*MAX_OPEN_FILES)
  #endif
  
  /* the max number of connections that the smbstatus program will show */
--- 34,46 ----
     MAX_CONNECTIONS services, but any number of machines may connect at
     one time. */
  #define MAX_CONNECTIONS 127
! /* #define MAX_OPEN_FILES 100*/
! #define MAX_OPEN_FILES 200
  
  /* Default size of shared memory used for share mode locking */
  #ifndef SHMEM_SIZE
! /* #define SHMEM_SIZE (1024*MAX_OPEN_FILES)*/
! #define SHMEM_SIZE (1024*100)
  #endif
  
  /* the max number of connections that the smbstatus program will show */


Hope this helps ... and a final thought may be the default of 100 is rather 
small - what are the resource implications of increasing - just small amount 
of extra memory per smbd?

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| Peter Polkinghorne, Computer Centre, Brunel University, Uxbridge, UB8 3PH,|
| Peter.Polkinghorne at brunel.ac.uk   +44 1895 274000 x2561       UK          |
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