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Ticket Diff – NEMO

Changes between Version 7 and Version 8 of Ticket #1943


Ignore:
Timestamp:
2018-10-11T11:56:39+02:00 (6 years ago)
Author:
francesca
Comment:

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  • Ticket #1943

    • Property Cc timgraham removed
    • Property Wp_comment changed from The improvement of the hybrid coarse-grained approach (about 7% when the MPI scalability limit is reached) is not enough to justify the refactoring of the code. A final test by combining a tessellated approach with OpenMP will be performed and the ticket will be closed by the end of this year. to The improvement of the hybrid fine-grained and coarse-grained approaches is under discussion within the NEMO HPC-WG. The action will be completed and the ticket will be closed by the end of 2018. No development branch to be included in NEMO 4.0

  • Ticket #1943 – Description

    v7 v8  
    11== Context == 
    2 Evaluation of the scalability improvement due to the introduction od a second level of parallelism in NEMO based on the MPI+X model (where X is OpenMP). A new coarse-grained approach is evaluated in order to improve the efficiency of the fine-grained version developed during 2016. 
    3  
     2Evaluation of the scalability improvement due to the introduction of a second level of parallelism in NEMO based on the MPI+X model (where X is OpenMP). A new coarse-grained approach is evaluated in order to improve the efficiency of the fine-grained version developed during 2016.  
    43 
    54== Implementation == 
    65 
    7 1. the new ZDF package, rewritten by Gurvan is considered as test case (2017) 
    8 2. a single OpenMP parallel region that includes all the ZDF packages (2017) 
    9 3. implementation of a module for the OpenMP horizontal decomposition; introduction of OpenMP directives within the ZDF manager (2017) 
    10 4. tests of restartability and reproducibility on GYRE_PISCES (2017) 
    11 5. definition of the computational performance test plan and performance evaluation on different HPC systems (2017) 
    12 6. discussion with the NEMO ST and HPC-WG (2017) 
    13 7. extension of the approach to the tracers advection (2018) 
    14 8. definition of the computational performance test plan and performance evaluation on CMCC HPC system (2018) 
    15 9. discussion with the HPC-WG (2018) 
     61. the new ZDF package, rewritten by Gurvan is considered as test case (2017) --> done 
     72. a single OpenMP parallel region that includes all the ZDF packages (2017)  --> done 
     83. implementation of a module for the OpenMP horizontal decomposition; introduction of OpenMP directives within the ZDF manager (2017)  --> done 
     94. tests of restartability and reproducibility on GYRE_PISCES (2017)  --> done 
     105. definition of the computational performance test plan and performance evaluation on different HPC systems (2017)  --> done 
     116. discussion with the NEMO ST and HPC-WG (2017)  --> done 
     127. extension of the approach to the tracers advection (2018)  --> done 
     138. definition of the computational performance test plan and performance evaluation on CMCC HPC system (2018)  --> done 
     149. discussion with the HPC-WG (2018)  --> ongoing