Portable Runtime Support and Exploitation of Nested Parallelism in OpenMP

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https://hal.inria.fr/inria-00070693

Submitted on 19 May 2006

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Portable Runtime Support and Exploitation of Nested Parallelism in OpenMP

Panagiotis Hadjidoukas, Laurent Amsaleg

To cite this version:

Panagiotis Hadjidoukas, Laurent Amsaleg. Portable Runtime Support and Exploitation of Nested Parallelism in OpenMP. [Research Report] RR-5307, INRIA. 2004, pp.12. �inria-00070693�

ISSN 0249-6399 ISRN INRIA/RR--5307--FR+ENG

a p p o r t

d e r e c h e r c h e

Thème SYM

INSTITUT NATIONAL DE RECHERCHE EN INFORMATIQUE ET EN AUTOMATIQUE

Portable Runtime Support and Exploitation of Nested Parallelism in OpenMP

Panagiotis E. Hadjidoukas — Laurent Amsaleg

N° 5307

Septembre 2004

Unité de recherche INRIA Rennes

IRISA, Campus universitaire de Beaulieu, 35042 Rennes Cedex (France)

Téléphone : +33 2 99 84 71 00 — Télécopie : +33 2 99 84 71 71

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T8T ÙU VWX'Y

#pragma omp parallel

0 50 100 150 200 250 300 350 400

2 4 8

Threads

Overhead (µȢ)

Omni Omni-Nth OMPi OMPi-Nth

#pragma omp for

0 50 100 150 200 250

2 4 8

Threads

Overhead (µȢ)

Omni Omni-Nth OMPi OMPi-Nth

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=?>ST=å

Omni-NthLib

0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0

CG FT LU MG

Applications (OMP Library)

Speedups

OMP1 OMP2 OMP4

OMPi-NthLib

0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0

CG FT LU MG

Applications (OMP Library)

Speedups

OMP1 OMP2 OMP4

A&xy–w|}rc'Ž9LI©;ª;e7t=cŠM‰%_}b†—r½on

0 1 2 3 4

Bl ock-LU Radi osi ty FFT Queens

A ppl i c a t i ons

Speedup

OMP1 OMP2 OMP4

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T8T ÙU VWX'Y

U p d at e Phase

0 1 2 3 4

Omni-Nth OMPi-Nth WQ Intel Omni

OpenMP Compiler

Speedup

OM P 1 OM P 2 OM P 4

`

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u—¨€cNzW|}cDnƒp€cNˆp€_}€cN†—ˆMn®„’v§c¦—cNv§n¤u—¨‡M†—€†—vyv§cv§x§nrb´²ÛµO¶5cu—tMnrc€¦—c«pr_M†‚p¤p€_}c†‚‡M‡}vyx{‰†‚prx§u—Šnr‰N†‚v§cNn¤u—Š}v§l

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