Carpetx-developers February 2025

carpetx-developers@lists.einsteintoolkit.org

3 participants
5 discussions

Weekly call at 11am Thursday Eastern time
by rhaas＠illinois.edu 26 Feb '25

26 Feb '25

Title: CarpetX developer call When: 11am Thursday Eastern time Join Zoom Meeting https://pitp.zoom.us/j/93861697232 Join by phone (CA) +1 647-558-0588 Join using SIP 93861697232(a)zoomcrc.com

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Weekly call at 12pm Thursday Eastern time
by rhaas＠illinois.edu 20 Feb '25

20 Feb '25

Title: CarpetX developer call When: 12pm Thursday Eastern time Join Zoom Meeting https://pitp.zoom.us/j/93861697232 Join by phone (CA) +1 647-558-0588 Join using SIP 93861697232(a)zoomcrc.com

2 1

Weekly call at 11am Thursday Eastern time
by rhaas＠illinois.edu 12 Feb '25

12 Feb '25

Title: CarpetX developer call When: 11am Thursday Eastern time Join Zoom Meeting https://pitp.zoom.us/j/93861697232 Join by phone (CA) +1 647-558-0588 Join using SIP 93861697232(a)zoomcrc.com

1 0

Meeting Minutes – February 6, 2025
by Jay Kalinani 06 Feb '25

06 Feb '25

*Meeting Minutes – February 6, 2025* Present: Erik, Lucas, Roland, Liwei, Zach, Steve, Swapnil, Jay, Helvi, Allen ------------------------------ Liwei: - Comparing performance between Carpet and CarpetX. - Findings: - One refinement level test shows similar speeds. - With six levels, CarpetX is about 20% slower (with and without subcycling). - Removing additional synchronization calls for interprocess boundaries (ghost-zones) and keeping sync calls only for prolongation during the substep makes the speed comparable to Carpet. - Further optimizations are in progress. - Erik’s suggestion: Introduce a new grid point type to track prolongation boundaries and set a flag to check if they are synced. - Another potential issue: Using the PointDesc object (p.I) in CarpetX causes minor slowdowns compared to accessing indices in Carpet. - Erik’s input: The compiler should optimize this; Liwei will share an example .o file for Erik to analyze. Roland: - Z4c requires a test case. - Currently working on it and may seek Steve’s review later. Lucas: - Testing hybrid Runge-Kutta integrators with BBH simulations. - Successfully set up a multipatch system with two puncture data and extracted multipole data. - May need assistance with Z4c. - Updating the robust stability test parfile and will open a PR. Currently experimenting with different boundary conditions. - Reviewing PRs for NewRadX in SpacetimeX and CarpetX repositories. - Zach’s question: Any tests beyond scalar wave for multipatch? - Lucas is working on a BBH test case and aims for completion before the May release. - Helvi’s question: Status of multipatch implementation in CanudaX? - Lucas is still working on it. - Liwei’s question: Can the multipatch code be used directly? - Lucas explained that evolution codes must be modified to compute derivatives and project them onto the multipatch system. - Suggests adding an option to enable/disable multipatch rather than maintaining two code versions. ------------------------------ Next Meeting: Thursday, February 13, 2025 @ 10 AM CDT / 11 AM EST

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Weekly call at 12pm Thursday Eastern time
by rhaas＠illinois.edu 05 Feb '25

05 Feb '25

Title: CarpetX developer call When: 12pm Thursday Eastern time Join Zoom Meeting https://pitp.zoom.us/j/93861697232 Join by phone (CA) +1 647-558-0588 Join using SIP 93861697232(a)zoomcrc.com

1 0

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Carpetx-developers February 2025