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Using Parallel Computing to Reduce CPU Power

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(1)Using Parallel Computing to Reduce CPU Power Jérôme Galtier. To cite this version: Jérôme Galtier. Using Parallel Computing to Reduce CPU Power. RR-3621, INRIA. 1999. �inria00073056�. HAL Id: inria-00073056 https://hal.inria.fr/inria-00073056 Submitted on 24 May 2006. HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés..

(2) INSTITUT NATIONAL DE RECHERCHE EN INFORMATIQUE ET EN AUTOMATIQUE. Using Parallel Computing to Reduce CPU Power J´erˆome Galtier. No 3621 F´evrier 1999 ` THEME 1. ISSN 0249-6399. apport de recherche.

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(80)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              .                                      .  .                                                               .                                                                                                                                                                                                                                                                                                                                                                                       .                    " ! " ! " ! " ! " ! " ! " ! " ! " ! " ! " ! " ! " ! " ! " ! "!                . Cost: 1. cost = 1. Cost: 1/3. Method 1: reinvest time separatly on each parallel session. Cost: 1/3. Total: 1. 1/2. 1/2. )* )* )* )* )* )* )* )* )* )* )* )* )* )* )* * * * * * * * * * * * * * * *) ) * )) * )) * )) * )) * )) * )) * )) * )) * )) * )) * )) * )) * )) * )) *)*) & *) * % & % & % & % & % & % & % & % & % & % & % & % & % & % & % &% ''( ' ( ' ( ' ( ' ( ' ( ' ( ' ( ' ( ' ( ' ( ' ( ' ( ' ( ' (('' (( '( '( '( '( '( '( '( '( '( '( '( '( '( '( 50 MHz / 2.5 V. cost = 0.6250. 100 MHz / 5 V. Cost: 1/3. Cost: 1/27. Method 2: use the same clock frequency for the whole circuit. Cost: 1/27 Total: 1/9 cost = 0.5625. -. -. -. -. -. -. -. -. -. -. . //////////////////// - . - . - . - . - . - . - . - . - . - .-.-/ 000000000000000000000 +, +, +, +, +, +, +, +, +, ,+ + , + , + , + , + , + , + , + , + ,+,+ ,+, 75 MHz / 3.75 V. 75 MHz / 3.75 V. ts x‹~hQDZOF H K5¼(NOF7\R›–gDPRZ”PR‘‹‘‹F‘‹xyNOE U”\ NXP>uRFFlDFZX~RWŠx‹l5P9NXx‹EGgD‘‹Fj\hlEHD~hQw— ZXP^U”x‹\hl¦  s xy~hQcZXFœr K®ax ŒFZOFlpU–ŽP1WTNU”\FvSwgD‘‹\hx’U–icx‹uRFZXNOx‹U˜W \^›tiDF~hZXFFNV\R›g}PRZ”P^‘y‘‹F‘‹xyNOE!  xy‘‹‘yQcNOU”ZXP^U”F BD\>Ž%P|UkPRNO²g}PRZXPR‘y‘‹F‘‹x‹“1PRD‘‹F \hl9UXBDZXFFgDZO\wjFNONX\hZONaj1P^l93Fg3FZ_›<\hZXE Žx‹UXB¢P NXx‹~hlDIx H}j1PRlpUX‘‹Wœ‘y\>Ž#FZ#j\hlDNOQDEGgcU”x‹\hl¦ ‰ ‰ lIU”BDF(QDgDg3FZžg}PRZ_U\R›ŒU”BDF(gDx‹jU”QcZXFR/Ž#FaNXBc\ Ž UXBDF xylDx’U”xyPR‘©U”PRNX²œŽx‹UXB9FlDFZO~RW!j\hN_UeHh  l!U”BDFeEGxyiciD‘yFeg}P^ZOUV\R›x‹UDU”BDFfU”PRNX²x‹N*g3FZO›<\RZXEGFi \hl§U”BDZOFF*iDx‹NOUXxylcjU½gDZO\wjFNXNO\hZXN [A*BDF*j\RNOU[ZOFEIPRx‹lDN U”BDF*NXPREGF*NXx‹lDjF»UXBDF»U”\^UkPR‘wPREG\hQDlpU \R›ŒŽ#\hZO²GPRlDi|U”BDFa¬»Y½¼ j‘‹\wjk²§›<ZOFš/QDFlcjWIiD\elD\RUžjkB}PRlc~hFR  #QcUž\hlIUXBDx‹NžF±ScPREGgD‘yF^TUXBDF UkPRNO²x‹N*j\hEGgD‘‹FUXFiŽx‹UXBDx‹l™P–UXBDxyZOi!\R›ªU”BDFf\RZXx‹~hxylDPR‘©iDQcZ”P^UXxy\hl© ½stxylDPR‘y‘’WhcxylU”BcFf‘y\>Ž#FZ g}PRZOUTŽ#FaUXQDZXlUXBDFa~hPRxylœxylœU”x‹EIF(xylpUX\|P–~pPRx‹lx‹lFlDFZO~RW K U”BDFe¬»Y½¼ j‘‹\wjk²INXg3FFi!PRlDi U”BDF§uR\h‘‹U”PR~hFGPRZOF§iDFjZXFPRNXFiŠpW7P›°P^jU”\RZK\R›½U”BDZOFF^ªNX\U”B}P†UKU”BDF|FlDFZO~RW¢j\hNOUe\^›žUXBDF j\hEGgDQcU”P^U”x‹\hlxyNiDx’uTxyicFi™pWlcxylDF^  Cost: 1/27. Method 3: use optimized frequencies for each part of the circuit. 11 2 11 2 11 2 11 2 11 2 11 2 11 2 11 2 11 2 11 2 11 2211  2 3 333333333333333333 2 2 2 2 2 2 2 2 2 2 2 4 444444444444444444  56 56 56 56 56 56 56 56 56 56 65 5 6 5 6 5 6 5 6 5 6 5 6 5 6 5 6 5 6 5 6565 656. cost = 0.5414. 64.7 MHz / 3.27 V. 81.5 MHz / 4.07 V. 87. :9. ;=<>;. ?A@CBEDGFIHKJLDG@CMONQPRFSP=TTK@UT>H>BGV. ‰ U x‹N j‘‹F1PRZU”B}P^U›<\hZtEIPRlpW–NOWTNOUXFEGN/lD\RU PR‘‹‘wU”BcF»j\hEGgDQwUkP^UXxy\hl|jPRl§3F»g}PRZXPR‘‹‘yF‘yx‹“FiIx‹l PRl–P^ZXDx’U”ZXPRZOWel/QDEŒFZ\R›cgDZX\TjFNXNO\hZXN  ‰ l§stx‹~hQDZOF#rw†Ž#Fx‹‘‹‘yQDN_U”ZXP^U”FžiDx ©FZXFlpUtNOU”ZXP^U”F~hx‹FN \R›U”QDZOlDxylc~¢U”BDF~pP^xyl x‹l U”x‹EIFx‹lpU”\7P¢~pP^xyl x‹l5gŒ\>Ž#FZ|j\RNOU|ŽBDx‹‘yF!B}P1uTx‹lD~7iDx ŒFZOFlpU iDF~hZOFFN(\R›g}PRZXPR‘‹‘yF‘yx‹NXE!  6 ´ „^‚v

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(87) {.   $   . 100% P=1 P=2 P=3 P=4. Share of energy saved. 80%. 60%. 40%. 20%. 0% 0. 0.2. 0.4 0.6 Share of task parallelized (W1/(W1+W2)). 0.8. 1. sxy~hQcZXFeoEKP0[lDFZO~RWNXP>uTx‹lD~hN›<\hZ»u^PRZXx‹\hQDNl/QDEŒFZXNV\R›tgcZX\TjFNONX\hZON . Ï<ËѪÏ<Ò.

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(140) Unit´e de recherche INRIA Lorraine, Technopˆole de Nancy-Brabois, Campus scientifique, ` NANCY 615 rue du Jardin Botanique, BP 101, 54600 VILLERS LES Unit´e de recherche INRIA Rennes, Irisa, Campus universitaire de Beaulieu, 35042 RENNES Cedex Unit´e de recherche INRIA Rhˆone-Alpes, 655, avenue de l’Europe, 38330 MONTBONNOT ST MARTIN Unit´e de recherche INRIA Rocquencourt, Domaine de Voluceau, Rocquencourt, BP 105, 78153 LE CHESNAY Cedex Unit´e de recherche INRIA Sophia-Antipolis, 2004 route des Lucioles, BP 93, 06902 SOPHIA-ANTIPOLIS Cedex. ´ Editeur INRIA, Domaine de Voluceau, Rocquencourt, BP 105, 78153 LE CHESNAY Cedex (France)   

(141).     ISSN 0249-6399.

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