LLNL-PRES-XXXXXX This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. Lawrence Livermore National Security, LLC

DOE Centers of Excellence Performance Portability Meeting Overview and Kickoff

RobNeely,LLNLApril 19, 2016 Glendale, AZ

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§  CenterofExcellence(COE)—  Wikipedia:Ateam,asharedfacilityoranen7tythatprovidesleadership,bestprac7ces,

research,supportand/ortrainingforafocusarea.

§  COE’sarenowconsideredthemselvesabestpracBceforourlargeHPCprocurements—  VendorparBcipaBonprovidesavaluableaddiBontoDOEapplicaBonpreparaBon

§  But…—  There’snorulebookwriMenforhowbesttouBlizethesepartnerships—  Cross-COEparBcipaBonmostlyad-hocduetothefocusednatureonaparBcularplaPorm

§  And…—  ApplicaBonsinDOEgenerallymustbeabletorunacrosstheLeadershipCompuBng

FaciliBesorASCclassifiedsystems—  DOEspendsover$1BdollarsinvesBnginHPCplaPormseverydecade,andprobablyeven

moreinvesBnginapplicaBondevelopment—  ThisnextgeneraBonofmachinesare…disrupBve

§  So…—  Weneededaforumtoraisethediscussionupanotchtohelpbridgetheexcellentwork

goingonwithineachCOE

Welcome!Andwhyareweallhere?

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We’rehereto“diagonalizethematrix”

Sierra LLNL

IBM/NVIDIA

Summit ORNL

IBM/NVIDIA

Trinity LANL/SNL Cray/Intel

Cori LBNL

Cray/Intel

Aurora ANL

Intel/Cray

Platform-specific performance (current focus of each COE)

Portability across P

latforms

(focus of this meeting)

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§  ForpurposesofthismeeBng,Ipropose:—  Theabilitytorunanapplica7onwithacceptable*performanceacross

KNLandGPUbasedsystemswithasingleversionofsourcecode

§  BothtermsaresubjecBve—  Portable

•  FromanapplicaBonperspecBve,meansnothavingtomaintainmulBpleversionsofalgorithmstunedtodifferentarchitectures

—  Performance•  IdeallyperformancewouldbeashighasisachievableusingplaPorm-specifictechniques.Inreality,manycodeteamswillgiveupsomeperformanceforportability

§  Justusingportablestandards(e.g.MPI+OpenMP4)doesnotguaranteeperformanceportability

Sowhatisperformanceportability?

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§  ShareexperiencebetweentheCOEs

§ MakeconnecBonsbetweenapplicaBonteamsworkingsimilarideasoralgorithms

§  Addressthenumerouschallengesofperformanceportability

§  Engagevendorsinhelpingussucceedinourperformanceportabilitygoals

Goalsofthismee@ng

What are your goals?

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§  Inonephrase:Breadth(notDepth)—  Lotsofshortertalks—  BreakoutsessionstoidenBfymajorissues

Whattoexpectthisweek

Tuesday Wednesday Thursday Overviews of the five COEs Recap of HPCOR workshop

Managing the memory hierarchy

Tools & compilers

Exascale Computing Project Applications Development Focus Area

Application experiences using performance portable abstractions

IO / burst buffers

Short NDA talks from Intel and NVIDIA

Breakout sessions: •  Perf-port abstractions •  Managing the mem hiearchy

Domain specific languages

Application talks – optimizations and algorithmic changes for next-gen platforms

OpenMP experiences and futures

Breakout sessions: •  OpenMP futures •  Tools/compilers/system

software

Performance-portable abstractions

Intel NDA session (dinner provided)

Wrapup Hosted Dinner

Tue/Wed: Lunch and Dinner on your own Thu: Lunch and Dinner provided

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§  Rooms:AuroraAB,SalonF,SalonG

§  Moderatorswillguidediscussion

§  Splitinto4groups(self-select).—  Twogroupscoveringeachtopicindependently

§  Outbriefsofdiscussionswillfollow

§  AMendeesarewelcometosuggestalternaBvetopics

§  Feelfreetouseroomsforsidemee@ngs

BreakoutsessionsandBreaks

Breaks, lunches, dinners – use this time to network, ask questions of

speakers, build collaborations

You are here

Breakout/meeting rooms

Lunch/Dinner on Thurs

Lobby

Registration/help

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§  OurcallforabstractsexceededexpectaBons—  Bothinnumberandquality.—  ThesteeringcommiMeehadadifficultBmeselecBng–allwereaccepted

§  Thus,theBmelimitsontalkswillbestrictlyenforced—  AcountdownBmerwillinformspeakersoftheirlimit.Timerwillstart

immediatelyupontransiBon

§  PleasetrytoholdquesBonsunBltheendofthetalk,andthenonlyifextraBmeallows—  Speakers:letaudienceknowifyoupreferquesBonsduringyourtalk

§  Catchspeakersduringbreaks

Somanytalks,soliFle@me

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§  Thankstothevendors,weagreedearlyontokeepthemeeBngasopenaspossible

§ MosteveryonefromtheDOElabsortheiraffiliatesarecoveredunderNDA—  Ifyouarenot,PLEASEdonotaMempttojoinNDAdiscussionsforwhich

youarenotcovered

§  Everyone(bothspeakersandparBcipants)shouldhavereadandwilladheretoour“groundrules”

§  TalksanddiscussionsmustrefrainfromdiscussinginformaBonheldundernon-disclosureagreements.ContactyoursteeringcommiMeerepresentaBve(below)ifyouneedspecificguidance.

§  InthespiritofthemeeBng,talksanddiscussionsshouldaddressgeneralchallengestothegoalofperformanceportabilityandapproachesthatmightbeappliedtoovercomethosechallenges,ratherthanidenBfyingandcomparingstate-of-playataparBcularpointinBme.

§  TalksanddiscussionsshouldnotcompareperformanceacrossspecificplaPorms.TalksanddiscussionscanaddressperformanceimprovementsonagivenplaPormduetoprogrammingapproachesorcanaddressperformanceachievedrelaBvetoatheoreBcalperformancemodel.

§  Thefocusoftalksanddiscussionsshouldbeonportable,non-vendor-specificsoluBonsasseenfromtheapplicaBondeveloperperspecBve(thatis,abstracBonsthathidevendor-specificsoluBonsareacceptable).ItisexpectedthataparBcularfocusofthemeeBngwillbetoaddresspossibleevoluBonsofcurrentstandards(forexample,OpenMPandC++)tobeMersupportperformanceportability.

§  ProjecBonstofuturemachinesshouldnotbepresented.

§  Talksanddiscussionsmustbeunclassifiedandnon-sensiBveinnature.

§  SpeakersandparBcipants(bothlabsandvendors)shouldacceptthatDOEwillhavemulBpletargetplaPormsaspartoftheirnaBonalstrategyandjointhediscussioninthespiritofcooperaBon.AllCOEsareworkingtowardthegoalofmakingtheseplaPormsthemostusefulandhighperformancetheycanbewithoutthethreatof"vendorlock-in."

NDAmaterialshouldnotbediscussedexceptindesignatedsessions

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§  ThismeeBngismeanttobeacatalystforfutureworkandcollaboraBons— UsethisBmetobothlearn,andbuildcollaboraBons

§  (Most)talkswillbemadeavailablealongwithnotesonthemeeBngwebsite(hMps://asc.llnl.gov/DOE-COE-Mtg-2016)

§  Aninformalreportwillbegeneratedtocapturenextsteps

§  SuggesBonsforfollowonworkorfutureMulB-COEmeeBngsshouldbemadetoanyoneonthesteeringcommiMee

WhattoexpectaIerthemee@ngconcludes

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§  Thisgroupwasassembledlastfall,andarewhatmadethismee@ngpossible

JamesReinders…................. Intel/Trinity-CoriMikeGlass…........................ SNL/TrinityRebeccaHartman-Baker….. LBNL/CoriJohnLevesque….................. Cray/Trinity-CoriHaiAhNam…...................... LANL/TrinityRobNeely…......................... LLNL/SierraJimSexton…........................ IBM/Sierra-SummitTjerkStraatsma…................ ORNL/SummitTimWilliams….................... ANL/AuroraCyrilZeller…........................ NVIDIA/Sierra-Summit

ThankstotheSteeringCommiFee

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§  LoriMcDowell,LLNL–primaryorganizer

§  AshleyWilkins,LLNL–on-sitehelp

§  AndreaBaron,LLNL–website

§  TinaMacaluso,EmilySimpson,ASCHQ-notetaking

Givethanksthesupportcrewwhenyouseethem

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§  LLNLASCProgramformeeBngspace,

§  Vendors:OpeningrecepBon,Thursday’slunchanddinnerprovidedwiththetheirgenerousassistance

§  Thanksespeciallyto—  JayGould,Cray— GregBranch,NVIDIA—  LizaGabrielson,Intel—  JimSextonandKathrynO’brien,IBM

Finally,bigthankstoLLNLandthevendors

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Butit’sadryheat…

Average April High Temp in Phoenix: 85°

High Temp in Phoenix this week