Changes between Version 3 and Version 4 of WorkingGroups/HPC/Mins_2017_03_20
- Timestamp:
- 2017-10-03T16:51:42+02:00 (7 years ago)
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WorkingGroups/HPC/Mins_2017_03_20
v3 v4 17 17 '''Action''': Silvia to analyze the code modifications between the two versions. 18 18 19 == 2. Investigations of single core performance (Martin, Silvia, Tim)==19 == 2. Investigations of single core performance == 20 20 21 21 Martin provides an update on the activity: after the integration of the perf_regions tool within NEMO, Tim wrote a script to extract the metrics measurement. We have info on timing and on cache performance for each routine. Even if there is a mismatch between the cache performance and the measured bandwidth, some preliminary results could be presented during the meeting in Barcelona … … 24 24 25 25 26 == 3. Updates at the NEMO merge party and to the NEMO trunk (Silvia)==26 == 3. Updates at the NEMO merge party and to the NEMO trunk == 27 27 28 28 The hybrid parallel version has not been integrated in the trunk since some ST developers have expressed concerns about the code complexity, also considering the limited performance gain introduced by the OpenMP approach. The current OpenMP parallelization is fine-grain. Alternative parallelization approaches (e.g. coarse-grain, tiling) and their impacts on code performance and readability will be tested with a continuous feedback from the ST. … … 36 36 37 37 38 == 4. PSyclone/NEMO update (Andy)==38 == 4. PSyclone/NEMO update == 39 39 40 40 Since the Psyclone approach could be a bit invasive for the NEMO code, a new approach (based on DSL concept) has been tested within the IS-ENES2 project by STFC and is available on a github repository (DSL project). It is based on the development of a separate kernel for each loop on the grid points in the advection kernel implemented by CMCC, so that OpenMP, or OpenACC, or cache tiling can be implemented at kernel level to provide performance portability. … … 48 48 49 49 50 == 5. Issues to be discussed in Barcelona (all)==50 == 5. Issues to be discussed in Barcelona == 51 51 52 52 There are three talks scheduled for the HPC session of the meeting in Barcelona: a first talk on the HPC-WG activities, with a focus on the main results and the discussion on the readability/performance trade-off; a second talk on the BGC HPC issues and the third talk on single-precision work, proposed by BSC.
