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From: roger@nsc.nsc.com (Roger Thompson)
Newsgroups: comp.sys.nsc.32k
Subject: Re: NS32310 Vs NS32381
Message-ID: <4232@nsc.nsc.com>
Date: Thu, 23-Apr-87 01:12:18 EST
Article-I.D.: nsc.4232
Posted: Thu Apr 23 01:12:18 1987
Date-Received: Sat, 25-Apr-87 01:06:18 EST
References: <145@unsvax.UUCP> <4221@nsc.nsc.com> <323@winchester.UUCP>
Organization: National Semiconductor, Sunnyvale
Lines: 20

In article <326@winchester.UUCP>, mash@mips.UUCP (John Mashey) writes:

> To summarize, I think what's been said is that multiplies are about
> 30 cycles, adds about 50, and divides about 60, for DP.
> I'm not really familiar with 32081 timings: is the 32381 a bunch
> faster [in cycle counts], or is any speedup mainly from clock rate?
> I'm a lot more familiar with Whetstone/Linpack/etc ratings than
> actual FP cycle counts: are these numbers competitive?


The internals of the 381 are about 40% faster than the older 081.  Part
of this is due to the slave protocol, part is due to enhancements in the
ALU.  Benchmark performance is unfortunately more contingent on the
integer capabilities of the CPU at least as it relates to the
Whetstone and the Linpack benchmarks.  The 381 will operate with
all series 32000 CPUs all the way from the 32008 to the 32532.
At 10 MHZ with the 32016, you will get about 550 kwhets SP.  The same
part will get 2.8 to 3.0 Mwhets with the 532 at 30 MHZ.

Roger