Parallel prefix computation on the q-cube Processor x, 0≤x N₂(x) then u[x] := u[x] Ⓡy endfor

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Parallel prefix computation on the q-cube
Processor x, 0≤x<p, do t[x] = u[x] := v[x]
{initialize subcube "total" and partial prefix to own value}
for k=0 to q- 1 Processor x, 0≤x<p, do
get y := t[N(x)]
set t[x] := t[x] y
if x> N(x) then u[x] := u[x] Ⓡy
endfor
Transcribed Image Text:Parallel prefix computation on the q-cube Processor x, 0≤x<p, do t[x] = u[x] := v[x] {initialize subcube "total" and partial prefix to own value} for k=0 to q- 1 Processor x, 0≤x<p, do get y := t[N(x)] set t[x] := t[x] y if x> N(x) then u[x] := u[x] Ⓡy endfor
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