imported>AnomieBOT: Dating maintenance tags: {{Cn}}

2025-11-18T09:32:51Z

Dating maintenance tags: {{Cn}}

New page

{{Refimprove|date=August 2007}}
In [[parallel computing]], the '''Geometric Arithmetic Parallel Processor''' ('''GAPP'''), invented by Polish mathematician Włodzimierz Holsztyński in 1981, was patented by [[Martin Marietta Corporation]]<ref>{{cite patent |country=US |number=4739474 |invent1=Holsztynski, Wlodzimierz |status=patent |title=Geometric-arithmetic parallel processor |pubdate=1988-04-19 |gdate=1988-04-19 |fdate=1983-03-10 |pridate=1983-03-10 |assign1=Martin Marietta Corporation, MD. |assign2=Geo Semiconductor Inc |url=https://patents.google.com/patent/US4739474A/en}}</ref> and was owned by a wide variety of companies over its lifetime, including [[Lockheed Martin]] after Martin Marietta, Co. merged with Lockheed. The final patent assignee was Geo Semiconductor, Inc. at the time of the patent expiration in 2023.

The GAPP's [[network topology]] is a [[mesh networking|mesh]]-connected array of single-bit [[SIMD]] [[processing element]]s (PEs), where each PE can communicate with its neighbor to the north, east, south, and west. Each cell has its own memory. The address-space is the same for all cells. The data travels from the cell memories to the cell registers, and in the opposite direction, in parallel. Characteristically, the cell's [[arithmetic logic unit]] (ALU) (that is, its PE) in the early versions of GAPP was nothing but a [[1-bit computing|1-bit]] full-adder/subtractor, which efficiently served both the complex arithmetic as well as logical functions, and with the help of shifts it also performed geometric transformations—in short, it was doing all three types of the tasks (while other designs used three separate special-purpose hardware units instead).

The 10,000-element GAPP grew to 82,944 elements by 1992.<ref>{{cite book|author=Gilbert Kalb and Robert Moxley|title=Massively Parallel, Optical and Neural Computing in the United States|year=1992|publisher=IOS Press|isbn=9789051990973|page=20|url=https://books.google.com/books?id=7Ao4TBf4uv4C&pg=PA20}}</ref> In its most recent incarnation (as of 2004), the systems by Teranex utilize GAPP arrays of up to 294,912 processing elements.{{cn|date=November 2025}}

In mathematics, Holsztyński is known for the Holsztyński theorem.<ref>{{cite journal | last=Holsztyński|first=W. |title=Continuous mappings induced by isometries of spaces of continuous functions |journal=
Studia Mathematica | volume=26(1966)|pages=133–136}}</ref>

==References==
{{Reflist}}

[[Category:SIMD computing]]
[[Category:Digital signal processing]]

{{compu-hardware-stub}}

Geometric Arithmetic Parallel Processor - Revision history

imported>AnomieBOT: Dating maintenance tags: {{Cn}}