Large shared memory segments

Large shared memory segments

Post by the wharf r » Tue, 24 Aug 1999 04:00:00



        Ok, I give up.  :-)

        I asked about shared memory segments > 2GB.  Several people
wrote to tell me to set shmmax properly, but that's not the problem here:

* IPC Shared Memory

4294967295      max shared memory segment size (SHMMAX)
     1  min shared memory segment size (SHMMIN)
   100  shared memory identifiers (SHMMNI)
   100  max attached shm segments per process (SHMSEG)

        How do I get a segment larger than 2GB?  Someone *please*
sell me a clue... :-)

 
 
 

Large shared memory segments

Post by Thomas Mieslinge » Tue, 24 Aug 1999 04:00:00



>         Ok, I give up.  :-)

>         I asked about shared memory segments > 2GB.  Several people
> wrote to tell me to set shmmax properly, but that's not the problem here:

> * IPC Shared Memory

> 4294967295      max shared memory segment size (SHMMAX)
>      1  min shared memory segment size (SHMMIN)
>    100  shared memory identifiers (SHMMNI)
>    100  max attached shm segments per process (SHMSEG)

>         How do I get a segment larger than 2GB?  Someone *please*
> sell me a clue... :-)

So what hardware do you use? A 32bit machine? I think theres little or
no chance to make it larger. An Ultra? Solaris 7 64bit Kernel? There you
might have a chance.

--
Thomas Mieslinger           Mobil: +49 170 510 6095
Koenigstrasse 44              Fon: +49 661 901 3975
36037 Fulda                   Fax: +49 661 901 4605


 
 
 

Large shared memory segments

Post by the wharf r » Wed, 25 Aug 1999 04:00:00




Quote:>So what hardware do you use? A 32bit machine? I think theres little or
>no chance to make it larger. An Ultra? Solaris 7 64bit Kernel? There you

        It's Ultra Enterprise hardware.  The people who installed the system
tell me the 64bit stuff was installed, and sysdef reports the expected
sparcv9 stuff.

        I'm confused...

 
 
 

1. What is this large share memory segment owned by root?

Hi,

My machine is running AIX 4.3.3.

I run the command ipcs -mb. and found :
T        ID     KEY        MODE       OWNER    GROUP     SEGSZ
Shared Memory:
m         0 0x0d05d2ee --rw-rw-rw-     root   system      1440
m         1 0x4704124c --rw-r--r-- informix informix        48
m         2 0x5804124c --rw-r--r-- informix informix      4096
m         3 0x4d04124c --rw-r--r-- informix informix      4096
m         4 0x4904124c --rw-r--r-- informix informix      4096
m         5 0x5004124c --rw-r--r-- informix informix      3222
m         6 0x45041253 --rw-rw-rw- informix informix        96
m         7 0x43041253 --rw-rw-rw- informix informix     97708
m         8 0x42041253 --rw-rw-rw- informix informix     36028
m         9 0x41041253 --rw-rw-rw- informix informix     42148
m        10 0x44041253 --rw-rw-rw- informix informix      2844
m    917515 0x081c90c4 --rw-r-----   oracle      dba  52850688
m   2228236 0x081c8245 --rw-r-----   oracle      dba 102694912
m        13 0x580550f1 --rw-rw-rw-     root   system 134217728
m        14 0x69041274 --rw-rw-rw-     prod     taps     25578

The segment with segment id 13 is very large, about 120MB.
m        13 0x580550f1 --rw-rw-rw-     root   system 134217728

What is this segment for? How can I know which program uses it?
How can I control it? say, reduce the size of it?

Many thanks.

Yerong

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