Porting Openacc 2 0 To Openmp 4 0 Key Similarities And-Books Pdf

Porting OpenACC 2 0 to OpenMP 4 0 Key Similarities and
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Roadmap to Exascale ORNL , Since clock rate scaling ended in 2003 Titan and beyond deliver hierarchical. HPC performance has been achieved parallelism with very powerful nodes MPI. through increased parallelism Jaguar plus thread level parallelism through. scaled to 300 000 CPU cores OpenACC or OpenMP plus vectors. OLCF5 5 10x Summit, Summit 5 10x Titan 20 MW, Titan 27 PF Hybrid GPU CPU. Hybrid GPU CPU 10 MW, Jaguar 2 3 PF, Multi core CPU 9 MW CORAL System. 7 MW,2010 2012 2017 2022, From Sierra and Summit Scaling to New Heights with OpenPower by David E Bernholdt Terri Quinn. Challenges CORAL , How does Summit compare to Titan.
Feature Summit Titan, Application Performance 5 10x Titan Baseline. Number of Nodes 3 400 18 688, Node performance 40 TF 1 4 TF. Memory per Node 512 GB HBM DDR4 38GB GDDR5 DDR3 , NVRAM per Node 800 GB 0. Node Interconnect NVLink 5 12x PCIe 3 PCIe 2, System Interconnect Dual Rail EDR IB 23 GB s Gemini 6 4 GB s . node injection bandwidth , Interconnect Topology Non blocking Fat Tree 3D Torus.
Processors IBM POWER9 AMD Ot er on , NVIDIApVolta NVIDIA. e Kp ler , File System 120 PB 1 TB s , P GFS 32 PB 1 TB s Lustre . Peak power consumption 10 MW 9 MW, 12 SC 14 Summit Bland Do Not Release Prior to Monday Nov 17 2014. Programming Models Challenges, Parallelism Heterogeneity Memory Hierarchies Resilience . Power, Performance Portability, Collaboration between industry and research institutions.
but mostly industry because they built the hardware . Maintenance, Maintaining a network stack is time consuming and expensive. Industry have resources and strategic interest for this. Extendibility, MPI X Y OR OMP X e g PGAS Exascale runtimes . Exascale programming environment is emerging, Exascale Challenges. Exascale Applications,PHL Constructs Architecutre Independent Code. NG Parallel Algorithms,Meta Programming e g Data Representations .
DSLs Work Decomposition ,Domain Libraries DSLs , Adaptability Portability Manages the runtime. Exascale Runtimes complexity for the user, Parallelism mapped to the Architecture. OpenMP Architecture Specific Optimized Code, threads SIMD Compiler Opt Tunable. Directive based programming, A key strategy for portable programming of accelerators. OpenACC was designed to program Titan, Several current implementations of OpenACC PGI Cray GCC Pathscale and.
several research compilers , Growing support for OpenMP 4 . Implementations are starting to emerge Cray Intel LLVM Pathscale GCC. Community of users based on OpenACC, Largely because of mature implementations of OpenACC. Plan to port benchmarks to OpenMP 4 0 understand, differences and similarities. There are some technical challenges that OpenMP 4 1. implementers are solving, E g Simulating SIMD on GPUs. Performance portability of codes,6 10 1 2015, Converting OpenACC to OpenMP 4.
Main difference is in the way we express the directives. Descriptive vs Prescriptive, OpenACC, OpenMP 4, Many constructs have 1 1 mappings. Others constructs can be lowered from OpenACC to OpenMP. Some constructs are present in one but not the other. At some points there are subtle differences e g OpenACC allows the. compiler more discretion regarding how loops are mapped to. hierarchical parallelism OpenMP 4 the user has the ultimate decision . 7 10 1 2015, OpenACC 2 0 vs OpenMP 4, OpenACC 2 0 features OpenACC 2 0 OpenMP 4 0. evolving with new features parallel target, which may impact OpenMP parallel gang workers vec target. 4 1 or 5 tor teams parallel simd, data target data. OpenACC interoperability with, parallel loop teams distribute parallel.
OpenMP is important for, incrementally port codes to update target update. OpenMP 4 cache Implicit compiler opt , Experiment with OpenACC wait OpenMP 4 1 draft. features not available in OepnMP, declare declare target. Current application data enter exit OpenMP 4 1 draft. investments in OpenACC routine declare target, porting are preserved when. async wait OpenMP 4 1 draft, porting to OpenMP, device type OpenMP 4 1 draft.
tile, host data OpenMP 4 1 draft,8 10 1 2015, OpenMP and OpenACC progress. OpenACC innovation continues OpenMP adopts relevant features. 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018. OpenMP 4 0 Portability across hardware platforms, Increased efficiency performance. TARGET Tools , OpenMP OpenMP TARGET, Effective parallelization vectorization. DATA, 3 0 3 1 DECLARE of C , TARGET OpenMP OpenMP. TARGET 4 1 5 0, UPDATE, Roughly TEAMS Roughly, similar DISTRIBUTsimilar.
E, OpenACC OpenACC, 1 0 2 0, KERNEL Nested, PARALL parallelism. EL ASYNC, DATA wait, LOOP ASYNC OpenAC, warp compute C 2 5. worker ASYNC, vector data, UPDATE transfer, CACHE TILE. Programming models must evolve before they can stabilize. 10 1 2015,9, Steps for the translation, Normalize OpenACC supported directives in OpenMP. Data Directives, Parallel directives, Accelerator Subroutines.
Convert runtime APIs, Converting OpenACC 2 to OpenMP 4 . Procedure 1 , 1 The user must modify any OpenACC constructs for which no equivalent. counterpart exists in OpenMP , Explicit data regions. kernels directive, device type clause no problem for OpenMP 4 1. host data and link clauses no problem for OpenMP 4 1. cache directive, Complex use of asynchronous streams.
Rewrite these in terms of features that map to OpenMP 4. 11 10 1 2015, Translating OpenACC 2 to OpenMP 4 , Procedure 2 . 2 Translate data regions , acc data omp target data. acc declare data omp target declare data, create map alloc . pcopy map tofrom , pcopyin map to , pcopyout map from . scalars need to be converted to firstprivate, use of async can be replaced by use of OpenMP CPU threads or tasks to.
handle transfers, if multiple devices used replace calls to acc set device num with. device clause, Note OpenACC 2 5 draft copy pcopy,12. Translating OpenACC 2 to OpenMP 4 , Procedure 3 , 3 Translate data update operations . acc update omp target update, host from , self from . device to , use of async can be replaced by use of OpenMP CPU threads or tasks to.
handle transfers,13 10 1 2015, Translating OpenACC 2 to OpenMP 4 . Procedure 4 , 4 Translate accelerator parallel regions generally . acc parallel omp target teams, acc loop gang omp distribute. acc loop worker omp parallel for simd , acc loop vector omp simd. acc loop independent teams parallel for , simd or any permutation of the combined directive.
gang dist schedule , num gangs num teams , num workers thread limit . vector length safelen , use of async can be replaced by use of OpenMP CPU threads or tasks to. handle device execution,14 10 1 2015, Translating OpenACC 2 to OpenMP 4 . Procedure 5 , 5 Adjust function attribute specifiers . acc routine omp declare target end declare, target.
OpenACC gang worker vector seq clauses have no exact counterpart. through increased parallelism Jaguar scaled to 300 000 CPU cores Titan and beyond deliver hierarchical parallelism with very powerful nodes MPI plus thread level parallelism through OpenACC or OpenMP plus vectors Jaguar 2 3 PF Multi core CPU 7 MW Titan 27 PF Hybrid GPU CPU 9 MW 2010 2012 2017 2022 OLCF5 5 10x Summit Summit 5 10x Titan 20 MW

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