Best of the Newsgroups: OSR5 number of semaphores SEMUME SEMMNU

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From: Bela Lubkin <belal@caldera.com>
Subject: Re: i386ld locore.o 40: can't allocate section .bss into owner KV_loads
Date: Wed, 29 Jan 2003 06:09:12 GMT
References: <zqvZ9.8345$LY2.502697@newsc.telia.net> 

Jakob Harrysson wrote:

> I get this error message when I relink the kernal !
> 
> i386ld locore.o 40: can't allocate section .bss into owner KV_loads
> i386ld locore.o 40: illegal operator in expression
> ERROR: Can not link-edit unix
> idbuild: idmkunix had errors.
> System build failed.
> 
> I had risen the semafore values like this:
> 
> SEMMNI  15
> SEMMNU  800
> SHMMAX  100663296
> SEMMNS  800
> SEMUME  800
> SEMMSL  800
> 
> I use a micronetics database called mumps and we are 160 users working
> active in the system.

These settings change the sizes of arrays in
/etc/conf/pack.d/sem/space.c:

  struct  semid_ds        sema[SEMMNI] ;
  struct  sem     sem[SEMMNS] ;
  int             semu[((16+8*SEMUME)*SEMMNU+NBPW-1)/NBPW] ;

The sizes of these structures are 20, 8 and 4 bytes each.  So we have:

  struct  semid_ds        sema[SEMMNI] ;
     20 * 15 = 300 bytes

  struct  sem     sem[SEMMNS] ;
     8 * 800 = 6400 bytes

  int             semu[((16+8*SEMUME)*SEMMNU+NBPW-1)/NBPW] ;
     4 * (((16+8*800)*800+NBPW-1)/NBPW)
     NBPW is 4 (sys/param.h):
     4 * (((16+8*800)*800+4-1)/4) =
     4 * ((6416      *800+4-1)/4) =
     4 * ((  5132800     +4-1)/4) =
     4 * ((  5132803         )/4) =
             5132800

You're asking for a semu[] array that's 5132800 bytes large.

The OpenServer kernel's total text + data + bss size is limited to 
8128KiB, or 8323072 bytes.  Having just increased its size by about 5
million, you've exceeded that limit.

You can have 800 SEMUME, or 800 SEMMNU, but not both.  Find out what
your database actually needs instead of raising every parameter you can
find.

>Bela<
 

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