Present: Roland, Swapnil, Allen, Lucas, Liwei, Jay, Steve
Performance Issues:
Liwei + Jay observed CarpetX being slower than Carpet in certain simulations when using CPUs (hydro + spacetime + 14 AMR levels).
Swapnil observed similar speeds between Carpet(X) with CarpetX using much fewer nodes.
For GPUs, Swapnil recommends: less boxes (equal to # of GPUs, perhaps less) controlled via max_grid_size for each level, set AMReX “refine_grid_layout” to “no”.
For CPUs, Roland
recommends: port CarpetX Z4c to Carpet, or run without spacetime, or
run wavetoy to isolate effects of science code vs infrastructure; try changing tiling parameters.
Compare w/ AthenaK: they advertise 98% efficient weak scaling. Due to infrastructure, # ghost zones, etc.? Potential apples to apples GPU code comparison in the future.
Updates:
Steve
Wrote introduction to subcycling paper.
Lucas
Multipatch tests working, looking towards evolving black holes.
Allen
MeudonBNSX working without OMP, check if array index is accurate, or put problematic code inside omp critical.
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Today's Topics:
1. Weekly call at 4pm Thursday Eastern time (rhaas@illinois.edu)
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Message: 1
Date: Wed, 08 Jan 2025 16:08:01 -0600
From: rhaas@illinois.edu
To: carpetx-developers@lists.einsteintoolkit.org, rhaas80@gmail.com
Subject: [Carpetx-developers] Weekly call at 4pm Thursday Eastern time
Message-ID: <E1tVeDZ-00000005alV-2RS5@ekohaes8.ncsa.illinois.edu>
Content-Type: text/plain; charset="ANSI_X3.4-1968"
Title: CarpetX developer call
When: 4pm Thursday Eastern time
Join Zoom Meeting
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Join by phone
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End of Carpetx-developers Digest, Vol 37, Issue 2
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