Re: Proposal of tunable fix for scalability of 8.4

On 3/13/09 8:55 AM, "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> wrote:

>>> "Jignesh K. Shah" <J(dot)K(dot)Shah(at)Sun(dot)COM> wrote:
> usr sys wt idl sze
> 38 11 0 50 64

The fact that you're maxing out at 50% CPU utilization has me
wondering -- are there really 64 CPUs here, or are there 32 CPUs with
"hyperthreading" technology (or something conceptually similar)?

-Kevin

Its a sun T1000 or T2000 type box, which are 4 threads per processor core IIRC. Its in his first post:

"
UltraSPARC T2 based 1 socket (64 threads) and 2 socket (128 threads)
servers that Sun sells.
"

These processors use an in-order execution engine and fill the bubbles in the pipelines with SMT (the non-marketing name for hyperthreading).
They are rather efficient at it though, moreso than Intel's first stab at it. And Intel's next generation chips hitting the streets in servers in less than a month, have it again.