SINGLE_CPU_VP

Hi, We have a SMP machine with linux Suse 6.4 kernel 2.2.14. Does SINGLE_CPU_VP must be 0 or 1 ? What is the meaning of this variable ? Thank in advance.

http://www.informix.com/answers/english/docs/73ids/4354.pdf Administrator's Guide for Informix Dynamic Server pages 33-84 and 33-85 If you have a single CPU system the answer is 1, otherwise 0 Should you have more than one CPU you will also need to tweak MULTIPROCESSOR NUMCPUVPS Wynne <hoping this isn't another trick spam> In article <8q5885$7lu$1@news.xmission.com>, siugua <siugua@uncoma.edu.ar> wrote: > > Hi, > > We have a SMP machine with linux Suse 6.4 kernel 2.2.14. > > Does SINGLE_CPU_VP must be 0 or 1 ? > > What is the meaning of this variable ? > > Thank in advance. > Sent via Deja.com http://www.deja.com/ Before you buy.

If you have SMP with more than one CPU (not much of an SMP otherwise I guess) you need to set MULTIPROCESSOR to 1. If you have NUMCPUVPS set to a value greater than one, or you want to be able to increase it beyond 1 using onmode -p +1 cpu you should set SINGLE_CPU_VP to 0 otherwise if you set NUMCPUVPS to 1 and have no intention of dynamically adding CPU VPs then set SINGLE_CPU_VP to 1. MULTIPROCESSOR 0 enables performance enhancements that preclude the possibility that processes may be running simultaneously on multiple CPUs, SINGLE_CPU_VP 1 enables performance enhancements that preclude the possibility that more than one CPU VP may be trying to access the same data structures (whether timeshared or concurrently). Art S. Kagel siugua wrote: > > Hi, > > We have a SMP machine with linux Suse 6.4 kernel 2.2.14. > > Does SINGLE_CPU_VP must be 0 or 1 ? > > What is the meaning of this variable ? > > Thank in advance.