hyperthreading and onconfig parameters

We are upgrading our database servers to HP ProLiant DL380 G4 two-way systems. This platform supports enabling or disabling "hyperthreading". (See, for example, http://sysadminforum.com/t36970.html.) With hyperthreading enabled, the OS (Solaris 9, x86) sees 2 logical processors for each physical processor. With IDS (7.31), is it better to enable or disable hyperthreading? Is the answer situational? How would you configure the following onconfig parameters? MULTIPROCESSOR NUMCPUVPS SINGLE_CPU_VP AFF_SPROC AFF_NPROCS sending to informix-list

In my experience you don't get the same 'absolute' power when hyperthreading is turned on i.e. Non Hyperthread Processor Power > 2* Hypertheaded power. But if you two major processes running you get alot less contention with hyperthreading on, and both processes run more smoothly Spurgeon, John P wrote: > We are upgrading our database servers to HP ProLiant DL380 G4 two-way > systems. This platform supports enabling or disabling "hyperthreading". > (See, for example, http://sysadminforum.com/t36970.html.) > > With hyperthreading enabled, the OS (Solaris 9, x86) sees 2 logical > processors for each physical processor. > > With IDS (7.31), is it better to enable or disable hyperthreading? Is > the answer situational? How would you configure the following onconfig > parameters? > > MULTIPROCESSOR > NUMCPUVPS > SINGLE_CPU_VP > AFF_SPROC > AFF_NPROCS> > sending to informix-list -- Paul Watson # Oninit Ltd # Growing old is mandatory Tel: +44 1436 672201 # Growing up is optional Fax: +44 1436 678693 # Mob: +44 7818 003457 # www.oninit.com #