Re: 2 CPU VP's
Chao Y. Din wrote:
>
> Juan R. Guzman wrote:
> >
> > I have a Sparc 20 with 2 processors with Solaris 2.4 and Online 7.11UC1. I have
> > been thinking of incrementing the amount of CPU VP's from one to two. I don't
> > use the server for anything else other that for the Informix application. Any
> > feedback from who has played with this before.
> >
> > thanks,
>
> We have one server that have almost identical settings: Sparc 20 with 2
> CPUs, Solaris 2.4, Online 7.11UC1, 96MB memory, 4 hard disks with
> 8GB. We also many other Sparc servers with many different hardware
> environment.
>
> We added the second CPU for Sparc 20 about one year ago and sAW the
> performance improvement immediately. Following is our settings. If they
> can be improved, please let me know.
>
> CLEANERS 4
> LRUS 24
> LRU_MAX_DIRTY 30
> LRU_MIN_DIRTY 15
> CHPTINTVL 1800
> MULTIPROCESSOR Y
> AFF_SPROC 0
> AFF_NPROCS 0
> NUMCPUVPS 2
> NUMAIOVPS 1
> SINGLE_CPU_VP N
> NOAGE 1>
> I believe that the above settings are appropriate only for two CPUs.
> Once the number of CPUs exceeds TWO, you cannot just add NUMCPUVPS. For
> example, you may want to evalute AFF_SPROC and AFF_NPROCS.
>
> Chao Din
>
> Chao Din
With only 2 cpu's you should set you setting for multprocessor to 0 (single cpu).
Informix recommends to only set this to 1 if you have a minimum of 4.
thanks,