SCHOOLOFCOMPUTERSTUDIES RESEARCHREPORTSERIES UniversityofLeeds Report93.26
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1 SCHOOLOFCOMPUTERSTUDIES RESEARCHREPORTSERIES UniversityfLeeds Reprt93.26 ParallelisatinftheRlls-RyceCFDS-ANSECde DivisinfCmputerScience JamesM.Camern by September1993
2 cllabrativeprjectbetweenleeds,thethereticalsciencegrupatrlls-ryceand theuniversityfedinburgh'sparallelcmputingcentre.wedescribethemethdf parallelisingalargecfdcde,usingadmaindecmpsitin.hwever,theturbulence mdelrequiresglbaldatatcalculatethemiinglength.herewedescribeamethd frcalculatingthemiinglengthacrssthedecmpseddmain. ThisreprtdetailsthewrkcarriedutattheUniversityfLeedsduringthePAP Abstract 1Intrductin TheaimfthisprjectwastparalleliseRlls-Ryce'sCFDS-ANSE(CmputatinalFluid DynamicsSystem-AlgrithmfrNavierStkesEplicit)cde[1,2,3].ANSEisaneplicit time-marchingnavier-stkesslverwhichusesjamesn'scell-centerednitevlumescheme [4]. wherethesubscriptidentesinviscidwterms,thesubscriptvdentesviscuswterms, 1.1StateEquatins Thecnservatinfmass,energyandmmentumisgivenbytheNavier-Stkesequatins (1) w e 1 CA;Fi=0B@u u2+p uh wu uv 1 CA;Gi=0B@v v2+p vh wv uv 1 CA;Ki=0B@w Fv=0B@ y w2+p wh uw z vw u vy wz+q CA;Gv=0B@ uy vyy wyz+qy y yy yz 0 Kv=0B@ z zy zz 0 1 CA; Intheabveisthedensity,u,v,wthevelcitycmpnentsinthe,yandzdirectins, uz vzy wzz+qz 1 S=0B@ 2y+2w 2z 2z 0 1CA: ethettalenergyperunitmass,pthestaticpressure,htherthalpy,andtheangular velcity.the'sandq'saretheviscusstressesandheatutermsrespectively,givenby 23@v 1@y
3 q= qy= andkisthecnductivitycecient.fraperfectgaswealshave withy=y,z=z,zy=yz.eistheeectiveviscsity,tisthestatictemperature qz= Frturbulentwtheeectiveviscsityandthermalcnductivececientbecme Frlaminarwe=landisgivenbySutherland'slaw,andk=lCp inarprandtlnumber,isassumedcnstant,andcpisthespecicheatatcnstantpressure. 1p+12(u2+v2+w2) 12(2r2) k=cp(l e=l+t Pr+t Prt) Pr,wherePr,thelam- wheretistheturbulentviscsityandprtistheturbulentprandtlnumber,whichistaken tbecnstant. 1.2FiniteVlumeDiscretisatin Equatin(1)maybeepressedinintegralfrmas 2 (2)
4 fraedreginvbundedbythesurfaces.herenistheunitutwardnrmalts,and Histhevectrfues,i.e. withthef'sg'sandk'sasin(1). discretefrm Thespacediscretisatinisbyastandardnitevlumemethd.Wereplace(2)bythe H=(Fi+Fv;Gi+Gv;Ki+Kv)=(F;G;K) ANSEvaluesarestredatthecentrefeachcellVJ.ThusHp,thevaluefHnacell wherenpisthevectrnrmaltfacepfcellvj,andjvjjrepresentsthevlumefvj. faceiscalculatedbytakingtheaveragevaluefhfrthecellcentresneithersidefface p.theglbaldmainvisbrkendwnintsmallercellsvj.bundarycnditins,which inmanycasesccurnthefacesfcellsntheedgefthelcaldmain,areenfrcedby (3) havingasetfdummycellsarundtheutsideftheglbaldmain.thevaluesatthe where thetwcellcentresneithersideistaken. mayberewrittenas centrefthesecellsaresetsthatthefacecenteredvaluesarecrrectwhentheaveragef Equatin(3)isthusasystemfcupledrdinarydierentialequatinsintime,which AneplicitN-stepRunge-Kuttaschemefthefrm FJ=SJjVJj XpHp:np: ddt(wjjvjj)=fj W(0) J=W(0) J+c1tF(0) W(0) J=WnJ W(i) J+c1tF(i 1) JJ schemec1=1:0,whilefra4stepscheme,thececientschsenarec1=0:25,c2=0:5 W(N) J=W(0). J+c1tF(N 1) andc3=0:55.frthetestcasesinsectin3,thetwstepschemewasused. isusedtintegratefrwardsintime.anseuseseither2r4stepschemes.fratwstep Wn+1 J=WNJ J 3
5 1.3TurbulenceMdel Theturbulentviscsitytmustbewrkedutusinganapprpriateturbulencemdel.ANSE usesamdiedbaldwin-lmamdel isthemiinglength,k(=0:41)and(=0:08)arecnstants,nisthedistancetthe wheretistheeddyviscsity,(u1;u2;u3)=(u;v;w),(1;2;3)=(;y;z)and l=minfknev;g @i)=l2d (5) (4) isdnebycheckingthevaluefeachcmpnentfthegradientfatestfunctin,.the nearestwall,evisthevandriestdampingfactrandistheshearlayerthickness. Inrdertcalculatetheshearlayerthickness,,wehavetsearchthrughthecells.This 1:0inthatdimensin.Thesearchbeginsbylkingattheapprpriatecmpnentfrin thethreespacedimensins.asearchisstartedfrmeachcellinwhichthegradientinthat spacedirectinisthemaimum,prvidedthatthecmpnentfrisgreaterrequalt cmpnentfrwhichthegradientisgreatestisntedfreachcell.wethenlpthrugh andbackwardsfrtheapprpriatecells,ineachfthethreespacedimensins,andsthe theneighburingcell,if(r)i<1:0thesearchisterminated(wherei=1;2;3frsearches alngthe;y;zaesrespectively).otherwisethecellisaddedtthesearchlength.ifwed tbecnstant.thismaybecalculatedfrmtheinletturbulenceintensitytuandacharacteristiclengthscalevia whereisthettal(i.e.laminarandturbulent)shearstress.deningt=tweget Innearwallregins,themiinglengthlismdiedbythevanDriestdampingfactr Ev=(1 e[( Anpl)=l]) l1=0:387tul (7) (6) whenitreturnstthecellfrmwhichitstarted.thissearchiscarriedutbthfrward bundary,eceptifthebundaryisarepeatbundary,inwhichcasethesearchterminates searchalgrithmisinvkedattalfsitimesfreachturbulencecalculatin. Inthefreestream(i.e.utwithanyidentiableshearlayers)themiinglengthisassumed ntcmeacrssacellwhere(r)i<1:0,thesearchisterminatednreachingthedmain whichmustbeslvediterativelyfrt. Theeectiveviscsityeffisgivenbycmbiningthelaminarandturbulentviscsities,i.e. t=2n2d(1 e[( Anp(t+l)D)=l])2 eff=l+t 4
6 2Parallelisatin 2.1Intrductin TheaimftheprjectwastparallelisetheCFDS-ANSEcde,withtheparallelisedcde runningveranetwrkfsilicngraphicswrkstatins.messagepassingbetweenprcessrs wastbehandledbyepcc'schimpmessagepassingsystem[5,6].theparallelisatin fthecdetkplaceintwstages.stageidealtwiththelaminar(i.e.nn-turbulent) cde,whilststageiiencmpassedtheparallelisatinftheturbulencemdel.generally, ntbeupdatedlcally.stageiisawtheintrductinfeplicitmessagepassingbetween StageIrequirednlyre-arrangingDOlpssthattheynlyranvercellsheldlcally ntheprcessr,andtheplacingfbundaryswapstupdatehalvalueswhichculd subdmains.thisprcessisknwnasdmaindecmpsitin.decmpsingthedmain thelaminarcde,butrequiredsmeeplicitmessagepassing. 2.2DmainDecmpsitin Inrdertenablethecdetberuninparallel,werstsplitthedmainintsmaller prcessrs.theneeceptintthiswastherepeatbundarycde,whichfrmedpartf attheedgefeachfthedecmpseddmainmayrequiredataheldntherdmainsin prcessrsnlngerhasaccesstallthedatafrthewhledmain.cnsequently,cells intrducesanewsetfprblemstvercme.thebiggestftheseisthateachfthe A A B B A A B B A B A B bthmrethan1prcessr. Figure1:Simplerepresentatinfdmaindecmpsitin.Thehal(shaded)cellslien A B A B A B A B 5 Prcessr 1 Prcessr 2 Internal Cells Hal Cells
7 updatednprcessr1(sincetheytneeddatafrmneighburingcells),butnprcessr 2.Thenewvaluesincells'B'arethenpassedtprcessr1.Thisisknwnasahalswap. rdertbeupdated.thisisaccmplisedbyhavingahalreginarundtheedgefeach areneededtupdatesmevaluesinthecellsmarked'a'.hwever,the'b'cellsarent subdmain.thecellsinthehalarethseneededtupdatethecellsattheedgefthe carriedutusingepcc'spul-rdlibraryffunctins,[7]. marked'a'and'b'aresharedbyprcessrs1and2.onprcessr1,thecellsmarked'b' subdmain.figure1shwstherelatinfhalcellstinternalcells.infigure1thecells 2.3StageI-TheLaminarCde TheStageIparallelisatintkinthedmaindecmpsitin,thedecmpsitinfarrays createdduringinitialisatin,andparallelisingthelaminarrutines. InCFDS-ANSEthedmaindecmpsitinandsubsequentupdatefhalcellswas functincall. ParallelisingEistingRutines DmainDecmpsitin ThebulkfwrkinStageIwasadaptingtheDOlpsintherelevantanserutiness ThedmaindecmpsitinwascarriedutusingEPCC`sPUL-RDutility[7],whichsupprts thatinsteadfrunningverallthecellsintheprblemdmain,theynlyranvercells regulardmaindecmpsitins.thisenabledbundaryswapstbecarriedutwithne inneighburingcells,thismeansthatcellsalngtheedgefthedatablck(thehal)will ntbeupdatedlcally,andwemustgetthenewvaluefrmaneighburingprcessr.the heldlcallybytheprcessr.inthecasewherecellsareupdatedusingvaluescntained thestaticpressurefreachcell. halupdatesarecarriedutusingrdswapcalls[7].aneamplefthisisgivenbelw.the cdesegmentistakenfrmtheanserutinepstati,therutinewhichsetsthevaluef C CDIR$IVDEP DO10K=2,KDIM DO10J=2,JDIM SETUPCONTRIBUTIONOFJANDKTOTHEOFFSET C NCOJK=IP1*(J-1+JP1*(K-1)) C DO10I=2,IDIM GETTHECELLOFFSET NCOFF=I-1+NCOJK 6
8 C GETRHO*STATICINTERNALENERGY RO=RHO(MRHO(NCOFF)) RRO=1./RO RU=RHOU(MRHOU(NCOFF)) C RV=RHOV(MRHOV(NCOFF)) RW=RHOW(MRHOW(NCOFF)) RET=RHOE(MRHOE(NCOFF)) C RES=RET-.5*(RU*RU+RV*RV+RW*RW)*RRO+RO*OMR2(MOMR2(NCOFF)) SETSTATICPRESSURE P=(HOEC(MHOEC(NCOFF))-1.)*RES GETTEMPERATURE becmesd10k=ksrt21,kend11 10CONTINUE T=P*RRO/RGSC(MRGSC(NCOFF)) IF(T.LE.0.0)T=TZERO TST(MTST(NCOFF))=T CDIR$IVDEP C SETUPCONTRIBUTIONOFJANDKTOTHEOFFSET d10j=jsrt21,jend11 GETTHECELLOFFSET d10i=isrt21,iend11 ncjk=idimg2*(j+jffg2-1+jdimg2*(k+kffg2-1)) C GETRHO*STATICINTERNALENERGY ncff=i+iffg2-1+ncjk r=rh(mrh(ncff)) rr=1./r ru=rhu(mrhu(ncff)) rv=rhv(mrhv(ncff))7
9 rw=rhw(mrhw(ncff)) ret=rhe(mrhe(ncff)) C SETSTATICPRESSURE res=ret-.5*(ru*ru+rv*rv+rw*rw)*rr+r*mr2(mmr2(ncff)) GETTEMPERATURE p=(hec(mhec(ncff))-1.)*res t=p*rr/rgsc(mrgsc(ncff)) if(t.le.0.0)t=tzer hals.afulldescriptinfthesetsandhwthelpindicesinparallelrelatetthe Thelpindiceshavebeenadjustedttakeaccuntfthereductininsizefthedatahandledbyneprcessr,andsetshavebeen(e.giffg2)tallwfrtheintrductinf 10CONTINUEtst(mtst(ncff))=t swapsarerequired.inthecaseftherutinewhichupdatesthewvariables(update), RepeatBundaries heldinthatcell.thus,inthiscase,thehalcellsmaybeupdatedlcallyandnbundary serialindicesisgivenin[8].thestatictemperatureisupdatedineachcellusingnlydata Asmentinedabve,thebulkfthestageIparallelisatininvlvedchangingDOlpindices thecalculatinfthenewvaluesrequiresvaluesfrmneighburingcells.herethehalcells Repeatbundariesareamethdfrapplyingcyclicbundarycnditins.ANSEdealswith andaddingbundaryswapswherenecessary.theeceptintthiswererepeatbundaries. arentupdatedlcally;insteadabundaryswapiscarriedutattheendftherutine. thisbysettingthedummycellsateachendftherepeatbundariessthatthetwends therighthandend,andsimilarlyfrtherighthanddummycells.onasingleprcessrthis iseasytdsinceallthenecessarydataisheldlcally.hwever,inparallelthismaynt arethesame.infigure2thewcellsareintheclumnswithan'f'abvethem,whilethe dummycellshavea'd'abvethem.therepeatbundaryismarkedwithan'r'.thevalues fthedummycellattheleftbundaryaresetthesameasthecrrespndingwcellat necessarilybetrueandthetwendsftherepeatbundarymayliendierentprcessrs. Thusitisnecessaryfrdatatbeechangedbetweentheprcessrscntainingthetw endsftherepeatbundary.initiallythemessagepassingwasaddeddirectlyttherepeat bundaryrutines(brep,visrepusingthepul-emfacility[9].thiswaslaterchangeds thattheswappingwasdealtwithbyadierentsubrutineswaprp. 8
10 R R F D D F Figure2:Diagrammaticrepresentatinfrepeatbundaries. 2.4StageII-TurbulenceCalculatin Intrductin AsinthestageIcalculatin,thereweretwaspectstthestageIIparallelisatin.Therst aspect,asinstagei,waschangingdolpindicesfrmglbaltlcal.thesecndaspect wasadaptingthemiinglengthcalculatintruninparallel MiingLengthCalculatininParallel InSectin1.3weutlinedthemethdANSEemplysfrcalculatingtheshearlayerthicknessduringthemiinglengthcalculatin.Inthissectinwedescribethecalculatinfrm aparallelpintfview,discussingsmeftheprblemsbrughtabutbythedmain decmpsitinanddescribinghwtheywerevercme. Thenaturefthesearchduringthemiinglengthcalculatinsintrducescmpleitiestthe parallelcde(inthefllwingupstreamreferstthedirectinfthesearch,whiledwnstream istheppsitedirectin.)aswithrepeatbundaries,theprblemisthatnnlcaldatamay berequiredtcalculatethesearchlength.hwever,unliketherepeatbundaries,itisnt knwninadvancewhichspecicremtecellswillbeneeded.generally,eceptinthecase frepeatbundaries,thesearchinthefurthestupstreamprcessrwillhaveterminated successfully(sinceitcntainstheglbaldmainbundary).thusasweep,passingthe searchlengthsinadwnstreamdirectinwillallwanyunterminatedsearchestpickup theremainingsearchlengthfrmupstream. Intheimplementatinfthemiinglengthcalculatin,thesearchiscarriedutintw phases: 9
11 Allthesearchesfrmthedwnstreamedgefthelcalblckarestartedneachprcessr.Ifthesearchreachestheupstreamedgefthelcalblckwithutterminating(e.g. thesearchterminateswhenthevrticitytestfunctinislessthanneinvalue)thisis aggedbymakingthesearchlengththusfarnegative.oncethesearchhascmetan Thesearchesfrmtheremainingsearches(i.e.thecellsupstreamftheedgecells) searchlengthisstredinthehalcellnettthecellfrmwhichhesearchwasinitiated.thesesearchlengthsarethenpassedinthedwnstreamdirectin,startingwith thefurthestupstreamprcessrandterminatingatthemstdwnstreamprcessr, wheretheyarestredintheapprpriateupstreamhalcell. end(eitherthrughsuccessfulcmpletinrreachingtheedgefthelcalblck)the withuthavingterminated,itpicksuptheremaininglengthttheendftheturbulent reginfrmtheapprpriatehalcell. arecarriedutaspertheserialcase.ifthesearchreachestheendfthelcalblck Prcessr 1 Prcessr 2 Prcessr 3 AA BB CC DD EE FF theremainingcellsarethenstarted,andanycellsunterminatednreachingtheendfthe gridpickuptheremaininglengthfrmthehal. (e.g.thelengthfrmthecells'cc'arestredin'bb'nprcessr1).thesearchesfrm necessary.thesearchlengthfrmtheupstreamprcessrisstredintheupstreamhal Figure3:Diagramshwingmiinglengthcalculatin.Thesearchisstartedfrmrws 'AA','CC'and'EE'.Thesesearchesarecmpleted,receivingdatafrmtherprcessrsif Directin f search (upstream) Figure3shwstherespectivepsitinsfsearchandstrecellsfrphase1.Searchingfrm lefttright,therstphasesearchesbeginatthedwnstreamedgefthelcalblck(rws Directin f sweep (dwnstream) 'AA','CC'and'EE').Oncethesearcheshaveeitherreachedtheendfthelcalblckr 10
12 righthandend(prcessr3infigure3).thislengthisstredintheupstreamhal(rws thecde,anunterminatedsearchfrmacellisdentedbymakingthesearchlengthfrm 'BB','DD'and'FF')andaddedntanyuncmpletedsearches.Oncethishasbeendne, arecmpletedbypickinguptheremainingsearchlengthfrmtheapprpriatehalcell.in westartthesearchesintheremainingcellsinthelcalblck.anyuncmpletedsearches terminatedsuccessfully,wepassthesearchlengthsdwnstream,thesweep,startingatthe serachlengthhasbeenpasseddwnstream.thusifwehaverepeatbundaries,andtheyare separatedinthesamedirectinasthesearchwedasecndsweepattheendftherst meanthatafterthesweep,therearestillsmeunnishedsearches,sincenlyapartial whilethebrkenlinesarecellsinthehal. Ifwehavearepeatbundary,itmightbethecasethattheprcessrattheupstreamend requiresthesearchlengthfrmtheprcessratthedwnstreamend.inturn,thismight thatcellsfarnegative.infigure3theslidlinesrepresentcellsheldinthelcalblck, dwnstreamdirectin,terminatingatthesecnd-mstdwnstreamprcessr.thisenables unterminatedsearchestbecmpleted. Thesendandreceiveperatinsarecarriedutbyaseparaterutine,calledSWEEP.SWEEP phase,frmthedwnstreamprcessrttheupstreamprcessr,andthencntinuingina backwardsfreeachfthethreespacedirectins,makingattalfsisearchesfreach ThealgrithmissetutinFigure4.Thesearchingrutineiscarriedutbthfrwardsand search(i.e.backwardsrfrwards)andthebuerswhichareusedtpassthedata.allthe updatingfsearchlengthsfrthedwnstreamfacesisdnewithinsweep. t,themiinglengtharraythespacedirectin,fthesearch,therelativedirectinfthe ispassedtheprcessrid'sfthetheprcessrsfrmwhmdataisbeingreceivedandsent searchmustbestartedfrmalldwnstreamedgecellsincaseanyfthesearchesfrmthe dwnstreamprcessrspassthrughthatcell. calculatinfthemiinglength.frinternalcells,thesearchisnlycarriedutfrma particularcellinnespacedirectin,thedirectinfmstturbulence,butthephasene 11
13 Step2ifntfurthestupstreamprcessrthenreceivesearchlengthsfrm Step1initiatesearchesfrmthedwnstreamfacefeachprcessr strereceiveddatainupstreamhal upstreamneighbur,addthemtanyunterminatedsearchlengthsand Algrithm Step3ifntfurthestdwnstreamprcessrthenpasssearchlengthsfrm Step4ifdirectinfsearchdesntseparaterepeatbundaries,gtStep8 Step5iffurthestprcessrdwnstream,passsearchlengthstfurthest Step6receivesearchlengthsfrmupstreamneighbur,addthemtany dwnstreamfacetdwnstreamneighbur Step7ifntupstreamneighburffurthestdwnstreamprcessrthenpass upstreamprcessrandgtstep8 Step9ifsearchunterminatednreachingendflcalblck,addremaining Step8initiatesearchesfrmremainingcellsinlcalblck searchlengthsfrmdwnstreamfacetdwnstreamneighbur unterminatedsearchlengthsandstrereceiveddatainupstreamhal Step10stp Figure4:Thealgrithmfrcalculatingthesearchlengthinagivendirectin.Thisalgrithm spacedimensins isthenrepeatedinthereversedirectin.thisprcedureiscarriedutfreachfthethree searchlengthfrmhal 12
14 3Results 3.12DTurbineBlade Herewegivetheresultsfr2-dimensinalturbulentwveraturbineblade.The2- dimensinalgridcntains11,172cells.thecdewasrunvervethusanditeratins,with theturbulencecalculatinbeingcarriedutaftereveryveiteratins.thetimingsfrruns ndieringnumbersfprcessrsaregivenintable1belw.themulti-prcessrrunswere numberfprcessrselapsedtime(s)r4000speedupr3000speedup 1 1y serialcde 16 1z 248 yparallelcde(r4000) zparallelcde(r3000) buttheverallruntimeisstillslwerthann1prcessr.on8and16prcessrsweseea 1prcessrt2.Thiscanbeattributedtthefactthatwehaveaddedcmmunicatins cstsingingfrm1prcessrt2.gingfrm2t4prcessrsweseesmespeedup, machine,whiletheslaveswerer3000machines.aswecansee,thereisnspeedupfrm carriedutnamiturefr3000andr4000machines;generallythemasterwasanr4000 Table1:Runningtimesfr2DANSEcalculatin.Thetimesgivenarewallclcktimes. slwdwn.thismightbeduettheprblemsizeremainingedwhilethecmmunicatin cstgesup. Turbulence Herewegivethetimingsfrthecdewithandwithuttheturbulencecalculatin.The runwasver500iteratins,andtheturbulencecalculatin(whenturnednintable2) nfprcessrselapsedtime(s)speedupelapsedtime(s)speedup turbn turb Table2:Cmparisnfturbulentandlaminarwcalculatinfr2DANSE
15 betterspeedupfrthecdewiththeturbulencecalculatin.alstheturbulencecalculatin accuntsfrapprimately10%ftheruntime. wascarriedutaftereveryveiteratins.thetimesareshwnaswecansee,wegeta 3.23DTurbineBlade InTable3wegivethetimingsfrdaytimerunsfthecdeverthefull3-dtest-case.The runwasvertwenty-veiteratinswiththeturbulencecalculatinagainbeingcarriedut numberfprcessrselapsedtime(s)speedupspeedupy speeduprelativettwoprcessrs yspeeduprelativetFOURprcessrs Table4wegivetimingsfrrunsatnight.Thedetailsftherunarethesameasfrtheday times. attheendfeveryveiteratins.the3-dimensinalgridcnsistsf126616cells.belwin Table3:Daytimerunningtimesfr3DANSEcalculatin.Thetimesgivenarewallclck numberfprcessrselapsedtime(s)speedupspeedupy speeduprelativettwoprcessrs yspeeduprelativetFOURprcessrs multi-prcessrrunswerecarriedutnamiturefr3000andr4000machines;generally themasterwasanr4000machine,whiletheslaveswerer3000machines. times. timeruns.thereisnneprcessrtimeduetprblemswithdadmemrymanager.the Table4:Overnightrunningtimesfr3DANSEcalculatin.Thetimesgivenarewallclck manager,whilewithtwprcessrsthereareprblemswithpagingintvirtualmemry. prblems.intheneprcessrcase,thisisshwnupbytheusefthedadmemry intable5,whichissignicantinallcases Therstthingtnteisthespeedupachievedbetweenrunningatdayandnight,shwn Inbththe1and2prcessrcases,thelargememryrequirementsfthecdecause 14
16 numberfprcessrsspeedup thatthedmainsizeisstillverylarge,andtherearecmmunicatinverheadsaswell.the Antherpssibleeplanatinastwhythespeedupissgreatfrm2t4prcessrsis Table5:Day-nightspeedups 1.26 speedupsfrm4-8-16prcessrsaremrealngtheepectedlines.theslwdwnthat appearswith32prcessrsmaybeduetetrawrkandcmmunicatinscreatedbythe activities. 3.3PerfrmanceAnalysis Takingthetimefr1+25iteratinsfEample3(3Dturbineblade)n16SGwrkstatins (asbefre,mainlyr3000,withthemastercdenar4000)wegetthefllwing ratifhalcellstinternalcells.cnsequentlymretimeisspentincmmunicatintype Theratef7.95MFlp/sisveryclsettheperfrmancefaR3000wrkstatin(8Flp/s), andsthenlybenetwegetfrmrunningtheparallelcdeisanincreasedvirtualmemry size,allwinglargerprblemstberun. Elapsedtimeperiteratin=31.48s 4Cnclusins Estimatedaveragerate=7.95MFlp/s asinglewrkstatin,thereisntmuchspeedup.thismaybeduetcmmunicatin Firstly,parallelisingthecdewassuccessful.Theparallelcdeprducesresultscmparable withtheriginalcde.lkingmreclselyattheresultsinsectin3,weseethat,althugh runningthecdeinparallelallwstheslutinflargerprblemsthanweculdslven cmmunicatinusingethernetimpliesthatitmaybewrthwhilerunningthecdena sharedmemrymachine. References [1]J.D.Nrthall.CmputatinalFluidDynamicsSystem(CFDS)-AnIntrductin.TechnicalReprtTSG0389,Rlls-Ryceplc,1988. csts,rincreasingtheratifhalcellstwcells.thehighcstfinter-prcessr 15
17 [4]A.Jamesn,W.Scmidt,andE.Turkel.NumericalslutinftheEulerEquatinsby [3]J.D.Nrthall.GeneralisatinftheCFDSBundaryCnditins.TechnicalReprt [2]Y.K.H.CFDS-ANSE:AnEplicitTimeMarchingNavier-StkesSlver.Technical nitevlumemethdsusingrunge-kuttatimesteppingschemes,1981.aiaapaper TSG0465,Rlls-Ryceplc,1992. ReprtTSG0646,Rlls-Ryceplc,1992. [7]SimnRChapple.PUL-RDPrttypeUserGuide,1992.Ref.EPCC-KTP-PUL-RD- [6]R.AlasdairA.Bruce.CHIMPVersin1.0UserGuide.TechnicalReprtEPCC-KTP- [5]R.AlasdairA.Bruce.CHIMPVersin1.0InstallatinGuide.TechnicalReprtEPCC- CHIMP-USER1.3,EdinburghParallelCmputingCentre,Nvember1992. KTP-CHIMP-INST1.2,EdinburghParallelCmputingCentre,January1993. [8]J.Parker.DesignfrDistributedMemryVersinftheRlls-RyceANSECde. [9]ShariTrewin.PUL-EMPrttypeUserGuide.TechnicalReprtEPCC-KTP-PUL-EM- PROT-UG. PROT-UG1.2,EdinburghParallelCmputingCentre,July1992. TechnicalReprtEPCC-EXT92-RR-DESIGN,EdinburghParallelCmputingCentre, 16
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