Tuning kernel parmeters for HPUX 11.0 Message Queues

[Michael Tully]

Hi,

Here are some suggested parameters that we use
without any problems. No need to change the
'msgmap' formula.


msgmap (2+MSGTQL)
msgmax 32768
msgmnb 32768
msgmni 1024
msgseg 32766
msgssz 32
msgtql 4096

as root to build your kernel you use this
method or use 'sam'

# cd /stand/build
# /usr/lbin/sysadm/system_prep -s system
# vi system (make your changes as above)
save file

# /usr/sbin/mk_kernel -s system
# /usr/sbin/kmupdate

# cd /
# /sbin/shutdown -r -y 0

HTH
-Michael

[Sridhar Bhaskarla]

Isaac,

The parameters related to IPC are to be adjusted according to the application needs.
For ex., tuxedo there is a command that gives
the required kernel parameters like "tmloadcf -c ubbconfig".

So, by default you don't need to change these values. Every application/software comes with it's own recommendations and we just need to implement them.

-Sri

[Isaac Loven]

Which param directly relates to C-Bytes ?
Thanks

[Sridhar Bhaskarla · Accepted solution]

Isaac,

There is no kernel parameter that is directly related to C-BYTES. Ofcourse QBYTES is limited by msgmnb (max# of bytes on any one message queue). My understanding is that this limit is set by the process usig IPC_SET called through msgctl within the limit of msgmnb.

So, it's upto the application to use these parameters. If it has to create more number of messages you would increase msgtql value. If it requires to create more number of queues, you will increase msgmni. But most of the time you don't have to derive them yourself. The software specifications provide these values.

-Sri