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[Users] KNL Office Hours

Author: Jack Deslippe <jrdeslippe_at_lbl.gov>
Date: 2020-01-10 08:51:46

Hi NERSC Users, NERSC is holding virtual office hours over Zoom from 9:00 am to 3:00 pm Pacific Time for every Friday in January starting today(!), to help users get their codes running efficiently on the Cori KNL nodes. For many users, running efficiently on the KNL nodes is as simple as making sure that their job script is set to request the proper thread affinity on the node, and their executable is compiled correctly to exploit the KNL architecture. We have seen a performance gap shrink by a factor of 7 just with these two simple steps. Other user codes may require some relatively straightforward code changes (for example, a loop reordering to exploit vectorization). Profiling the code is the first step towards finding these hot spots or bottlenecks. During the KNL Office Hours, NERSC experts will be on hand to help you take these steps. Please (virtually) drop by for help with - Setting up your job script for proper thread affinity - Compiling your code with the best optimization flags - Getting started with profiling your code - Interpreting the results of profiling, and advice on how to proceed You can connect to the office hours via the Zoom link https://lbnl.zo om.us/j/943079374 to get real-time assistance. Sincerely, Jack Deslippe NERSC _______________________________________________ Users mailing list Users@nersc.gov

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