Setting NUMCPUVPS

Can you set NUMCPUVPS = physical number of CPUs? We have 4 CPUs but were told that NUMCPUVPS should be 1 less than the physical number. Are there any risks at setting it to the actual number of CPUs? Thanks in advance.... :) Val Valerie H. Webber Valerie.H.Webber@m1.irs.gov 704-569-1002 x107

It depends on the speed of the CPUs and what else you will have running on the system. For a dedicated server with CPU faster than 400MHZ or so, depending on the specific CPU also, there are reports of getting increased performance with as many CPU VPs as 2 time the number of CPUS! With slower CPUs definitely not. If the machine is not a dedicated server you may want to reserve one CPU, at least, for other task as the Informix oninit processes NEVER relinquish the CPU they only expire their timeslice. This is even more true if your platform supports KAIO since the KAIO thread jumps in during any I/O waits. Art S. Kagel Webber Valerie H wrote: > > Can you set NUMCPUVPS = physical number of CPUs? > > We have 4 CPUs but were told that NUMCPUVPS should be 1 less than the > physical number. Are there any risks at setting it to the actual number of > CPUs? > > Thanks in advance.... :) > > Val > > Valerie H. Webber > Valerie.H.Webber@m1.irs.gov > 704-569-1002 x107