Changes between Version 2 and Version 3 of Projects/OpenIFS-IO


Ignore:
Timestamp:
08/08/13 14:28:43 (8 years ago)
Author:
grenville
Comment:

Legend:

Unmodified
Added
Removed
Modified
  • Projects/OpenIFS-IO

    v2 v3  
    1111We are beginning to write the scripts needed to extract the source code, mirror it to HECToR and build the model executable on the supercomputer which will be the basis of the job submission system. 
    1212 
    13 The project timeline is presented in the attached file. 
     13The project timeline is presented in the attached file (). 
     14 
     15 
     16Aug. 8th 
     17 
     18Considerable progress has been made with this project. The OpenIFS repository has been created on PUMA and the OpenIFS code installed. Mark has installed the necessary grib libraries on HECToR and the FDB libraries under a package account for maintainability and has set up environment modules to help manage the software installation. The FDB calls have been activated in the OpenIFS code and we have successfully extracted and built the model on HECToR. Glenn has made available several models at differing resolutions for testing. We have concentrated on the t1279 model (about 25km global resolution). Several scenarios have been investigated - the results are summarized in the figure below. A baseline performance with minimal IO is established for 1 and 8 OMP threads the model scales well, especially when run with 8 OMP threads. OpenIFS running with is 'single-writer' output scheme shows the characteristic performance slow down as a single processor throttles the rest in order to gather and output data. Our test generates hourly output for a total of 58GB/model day; time spent performing output is a very significant portion of the total (~25% of wallclock for 1024 processors, rising to ~40% wallclock for 4096 processors). Running with the FDB scheme shows an impressive performance improvement, whereby the time taken for asynchronous multiprocessor output is virtually hidden and amounts to not more than 5% of the wallclock time for the run. 
     19 
     20[[Image(oifs-t1279.png)]]