Onconfig parameters

[aroui]

I'm upgrading unix server from 4 to 8 processors
Informix onconfig file contains these lines :

MULTIPROCESSOR 1 # 0 for single-processor, 1 for multi-processor
NUMCPUVPS 3 # Number of user (cpu) vps
SINGLE_CPU_VP 0 # If non-zero, limit number of cpu vps to one

Is these parameters correct and do I have to change other parameters?

thanks for your help;
regards,

 

[mberni]

Hi!

MULTIPROCESSOR is 1
= your Informix will make use of them. -> FINE

NUMCPUVPS = 3
= Informix will start three virtual processors and assign one physical processor each

concerning optimization of this you will find a lot of answers, since it depends on your individual server and application which setting will be best for you. some say NUMCPUVPS should be NUM_OF_PHYSICAL_PROCESSORS - 1, other machines will perform better with NUMCPUVPS > PHYSICAL_PROCS.

So simply play around a little (if you can ...) to find out.