CPU Frequency Tuning for Optimizing the Energy. David Brayford 1
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1 CPU Frqucy Tuig or Optimizig th Ergy to Solutio. David Brayord 1
2 Cost o Larg HPC Systms Computr Hardwar HPC systm, cabls, data archivig systm tc. Buildig Th availability ad pric o ral stat. Th cost o grators, coolig systms, ir prvtio tc. Ergy Powr usag o th computr hardwar. Ergy usd to disapat th hat gratd by th systm. Ergy Comsumptio will likly bcom th domiat cost actor i th xt gratio o larg HPC systms Libiz-Rchztrum 2
3 Rduc Powr Cosumptio Procssors opratig at lowr clock rqucis cosum proportioatly lss powr ad grat lss hat. Dyamic scalig o th clock rqucy givs som cotrol i powr cosumptio, wh ot opratig at ull capacity. Comput cors ar idl durig IO opratios. Lowr procssor rqucy dos ot cssarily rduc rgy cosumptio as th applicatio will tak logr to xcut. Nd to cosidr costat costs associatd with ruig th HPC systm Libiz-Rchztrum 3
4 AutoTu Ergy Plugi Optimiz th rgy cosumptio o a arbitrary applicatio, by choosig th rqucy which rducs th rgy cosumptio or ach cod rgio. Aalyzs th prormac ad rgy data rom th procssors. Th phas rgio is aalyzd to mathmatically prdict th rqucy which optimizs th rgy cosumptio. A xhaustiv sarch with th two surroudig rqucis (uppr ad lowr o rom th optimal oud is prormd i ordr to ri th mathmatical modl. Optimal "rgy to solutio" coiguratio Libiz-Rchztrum 4
5 Ergy Modl ( ( F A GL3PS( B GIPS( G C GL3PS( GIPS( 1 GIPS ( H D GL2PS( CPI ( I E 1 CPI ( GL2PS( GIPS ( ( A Modl costats charactrizig or th platorm at rqucy, B, C, D, E, F, G, H, I GIPS( G istructios pr sc at th omial rqucy CPI ( GL2PS ( GL3PS ( ( ( ( Cycls pr istructio at th omial rqucy G L2 cach misss pr sc at th omial rqucy G L3 cach misss pr sc at th omial rqucy Prdictd rgy at Ergy at Libiz-Rchztrum 5
6 Eopt Faturs Writt i C++ Bidigs or C ad Fortra cods Support or: Paralll cods: MPI, OpMP ad Hybrid. Squtial cods. Sockt ad od lvl coutr masurmts. Compatibl with PAPI v4 ad PAPI v5 hadrs Provids accsss to krl mod opratios through/via boot damos ad customizd srvr applicatios: Chagig CPUFrq irastructur paramtrs. Accsss to th MSR dvics Libiz-Rchztrum 6
7 SadyBridg 1-6: RAPL (Ruig Avrag Powr Limit Coutrs. 7-8: IBM AEM (Advacd Ergy Maagmt Krl Modul. 1&2:Ergy o th 8 cors. 3 & 4: Ergy o th complt Packag (cor + ucor. 5 & 6: DRAM Ergy. 7: DC Coutr. 8: AC Coutr Libiz-Rchztrum 7
8 Ergy Plugi Compots Allow accss th library krl rom dirt laguags. Discovr o procsss topology: rgistr ad hadshak.elctio o th mastr procss pr od: od lvl coutrs. Coutr layr: Itrac or coutr commads Commuicatio btw srvr ad library do through a spcial il. Commuicatio with th Liux krl subsystm Libiz-Rchztrum 8
9 Cor Mtrics PAPI PAPI_ TOT_ CYC PAPI_TOT_INS PAPI_L2_TCM PAPI_L3_TCM PAPI RAPL PACKAGE_ENERGY:PACKAGEx PP_ENERGY:PACKAGEx TIMERS EXECUTION_ RUNTIME HWMON Hardwar Coutrs TEMPERATURE DC Ergy Cosumptio Coutrs AC Ergy Cosumptio Coutrs DRAM_ENERGY:PACKAGEx Libiz-Rchztrum 9
10 Compariso o Extral Masurmt Tools Tool DRAM SOCKET NODE RACK LIKWID X X PAPI RAPL X X PaddlCard X PDU X Tool Tchology Rsolutio LIKWID MSR 1ms PAPI RAPL MSR 1ms PaddlCard Ibmam HWMON 3 ms PDU Powr mtr 1 mi Libiz-Rchztrum 1
11 Tst Applicatios APEX MAP bchmark Grats artiicial calculatios ad mmory accsss or masurmt purposs. Assums that prormac bhavior o scitiic apps ca b modld by a st o spciic prormac actors. Simulat comput ad mmory boud applicatios. Dvlopd by th Laurc Brkly Natioal Laboratory Spciic prormac actors: mmory badwidth ad FLOPS. Strogly Implicit Procdur (SIP liar systm o quatios solvr. PMATMUL bchmark that prorms a paralll matrix matrix multiplicatio. Sissol simulatios o ralistic gophysical procsss Libiz-Rchztrum 11
12 Ergy Plot Libiz-Rchztrum 12
13 Eopt Faturs Thak You Qustios Libiz-Rchztrum 13
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