Changes between Version 53 and Version 54 of Working Groups/HPC


Ignore:
Timestamp:
2019-08-23T11:12:07+02:00 (13 months ago)
Author:
mikebell
Comment:

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  • Working Groups/HPC

    v53 v54  
    5858== [wiki:WorkingGroups/HPC/MainActivities2018 Main objectives and activities: 2018] 
    5959 
    60 '''NEMO benchmark''' 
    61  
    62 ''Description'': development of a benchmark (idealised geometry, equal MPI sub-domain size, realistic parameters, parametrisable communications, internal timings ...) at different resolutions to identify the bottlenecks to NEMO scalability. 
    63  
    64 ''Involved people'': Sebastien Masson (CNRS/ST), Eric Maissonave (CERFACS), Louis Douriez (ATOS), David Guibert (ATOS), Erwan Raffin (ATOS) 
    65  
    66 ''WP action'': HPC09_ESIWACE? 
    67  
    68 '''Intra-node performance''' 
    69  
    70 ''Description'': analysis and improvement of NEMO intra-node performance to move real towards peak performance and to reduce intra-node communications. Analysis at kernel level to understand which kernels are limiting performance; improving utilisation of memory hierarchy; loop vectorisation. Investigation and integration of a second level of parallelism based on the shared memory paradigm. Use of OpenMP (fine and coarse-grained parallelisation). 
    71  
    72 ''Involved people'': Silvia Mocavero (CMCC/ST), Francesca Mele (CMCC/ST), Mike Bell (MetO), Miroslaw Andrejczuk (MetO/ST), Matt Glover (MetO) 
    73  
    74 ''WP actions'': WP2018-01_Silvia Mocavero_singlecoreperf, WP2018-02_Francesca_Mele_hybrid 
    75  
    76  
    77 '''Inter-node communications''' 
    78  
    79 ''Description'': limiting the communication overhead through the reduction of the MPI communications number and frequency, the investigation of advanced MPI communications and techniques to overlap communication and computation. 
    80  
    81 ''Involved people'': Silvia Mocavero (CMCC/ST) 
    82  
    83 ''WP actions'': WP2018-03_Silvia Mocavero_globcomm, WP2018-04_Silvia Mocavero_mpi3, WP2018-05_AndrewC-extendedhaloes 
    84  
    85  
    86 '''Separation of concerns''' 
    87  
    88 ''Description'': investigation of a light-DSL approach to apply DSL in NEMO without impacting on the NEMO coding structure rules. The approach consists in processing the NEMO code to create an internal representation compliant to the PSyclone tool and manipulating the intermediate code to perform PSyclone transformations.   
    89  
    90 ''Involved people'': Andrew Porter (STFC) 
    91  
    92 ''WP action'': - 
    93  
    94  
    95 '''I/O''' 
    96  
    97 ''Description'': Investigation of techniques to reduce the I/O overhead which increases with the number of processors. Extension of the use of XIOS for reading/writing restart files.  
    98  
    99 ''Involved people'': Miroslaw Andrejczuk (Met Office/ST) 
    100  
    101 ''WP actions'': WP2018-06_andmirek-XIOSread, WP2018-07_andmirek_XIOSwrite 
    102  
    103  
    104 '''Mixed-precision''' 
    105  
    106 ''Description'': optimization of the NEMO model by using a mixed precision approach. Study on the precision needed by the different processes in NEMO. Implementation of the mixed precision approach in NEMO. 
    107  
    108 ''Involved people'': Miguel Castrillo (BSC), Oriol Tinto (BSC) 
    109  
    110 ''WP action'': WP2018-08_Mixed_precision 
    111  
    112  
    113  
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    11561 
     
    12874---- 
    12975 
    130 == Old version of page 
     76== [wiki:WorkingGroups/HPC/HomePage2014 
    13177 
    13278Working group leader (and responsible for wiki pages) : Sébastien Masson.