IPC System V SHM parameter

Posted in 2003

Schuran, Sven — Fri, 27 Jun 2003 09:54:37 — source: IIUG Forums & Mailing Lists

Hi all, Question about SHM Parameter, I have set this kernel.shmmni = 4096 kernel.shmall = 3100000 kernel.shmmax = 1200000000 kernel.shm-use-bigpages = 0 shmmni max number of shm segments maximal shmall max shm mem available in whole system, is it in KB or bytes or what? shmmax max size of one shm seg in bytes Is my opinion correct? Thanks Sven

↪ replying to Schuran, Sven

Schuran, Sven — Fri, 27 Jun 2003 15:18:45 — source: IIUG Forums & Mailing Lists

Hi all, What is the memory page size for System V ipc on linux kernel 2.4.20? How much shared memory I am able to use with one Inormix Instance on Linux kernel 2.4.20? Thanks Sven -----Ursprüngliche Nachricht----- Von: Schuran, Sven Gesendet: Freitag, 27. Juni 2003 11:55 An: ids@iiug.org Betreff: IPC System V SHM parameter [1441] Hi all, Question about SHM Parameter, I have set this kernel.shmmni = 4096 kernel.shmall = 3100000 kernel.shmmax = 1200000000 kernel.shm-use-bigpages = 0 shmmni max number of shm segments maximal shmall max shm mem available in whole system, is it in KB or bytes or what? shmmax max size of one shm seg in bytes Is my opinion correct? Thanks Sven

↪ replying to Schuran, Sven

Schuran, Sven — Mon, 30 Jun 2003 16:05:09 — source: IIUG Forums & Mailing Lists

Hi all, I have got it! For a Linux 2.4.20 64GB kernel and glibc 2.2.5 and Informix 9.40 UC1 and 4 GB main memory on an i386 You have to set the mapped_base address of the shell you are starting oninit! echo $$ output is "pidofshell" su - root echo 268435456 > /proc/"pidofshell"/mapped_base # is SHM Address 0x1000000L exit And set the onconfig SHMBASE 0x12000000L Now I am able to use up to 3GB shared memory! But you have to edit the profile for informix and other user using onstat etc. Here you have to set the mapped_base address too, this must be done as root, so you have to use sudo! cu Sven -----Ursprüngliche Nachricht----- Von: Schuran, Sven Gesendet: Freitag, 27. Juni 2003 17:19 An: ids@iiug.org Betreff: AW: IPC System V SHM parameter [1447] Hi all, What is the memory page size for System V ipc on linux kernel 2.4.20? How much shared memory I am able to use with one Inormix Instance on Linux kernel 2.4.20? Thanks Sven -----Ursprüngliche Nachricht----- Von: Schuran, Sven Gesendet: Freitag, 27. Juni 2003 11:55 An: ids@iiug.org Betreff: IPC System V SHM parameter [1441] Hi all, Question about SHM Parameter, I have set this kernel.shmmni = 4096 kernel.shmall = 3100000 kernel.shmmax = 1200000000 kernel.shm-use-bigpages = 0 shmmni max number of shm segments maximal shmall max shm mem available in whole system, is it in KB or bytes or what? shmmax max size of one shm seg in bytes Is my opinion correct? Thanks Sven