I’ve been trying to run Spritz using initial data generated by the latest version of FUKA for a BNS simulation, but I’ve run into issues related to the Kadath libraries.

At first, I was getting a mismatch error (Assertion ndim==nbr_points.get_ndim()), which suggests an incompatibility between Spritz’s bundled Kadath and the external version of FUKA/Kadath I used to generate the initial data.

To fix this, I tried to build Spritz against my own external Kadath installation (~/fuka/lib/libkadath.a) instead of the one bundled in the Einstein Toolkit. I did this by disabling these thorns in my thornlist: Fuka/kadath_pizza, Fuka/KadathImporter and Fuka/KadathThorn. I also added the following lines to my ET_2024_05/Cactus/simfactory/mdb/optionlists/<machine>.cfg

KADATH_DIR = $(HOME)/fuka

KADATH_INC_DIRS = $(KADATH_DIR)/include

KADATH_LIB_DIRS = $(KADATH_DIR)/lib

One question so far: Did I do things correctly?

Then I removed the old Kadath:

rm -rf configs/Spritz_LORENE/build/Kadath

The code compiles fine, but when I try to run the executable with my parameter file, using the '-S' option, I get:

Error: Thorn kadathimporter not found
Error: Thorn kadaththorn not found
Activation failed - 2 errors in activation sequence

The confusing part is that my ActiveThorns line in the .par file does not explicitly list KadathThorn or KadathImporter:

ActiveThorns = "volomnia bnstrackergen bnsanalysis pizzanumutils"

Yet Spritz fails because those thorns are missing. From what I understand, some of the thorns I’m using (like volomnia, bnstrackergen, or bnsanalysis) depend on KadathThorn and KadathImporter, so they are indirectly required.

The core problem:

- I need to keep KadathThorn and KadathImporter active, since my parameter file requires them through dependencies.

- But I also need them to link against my external Kadath (~/fuka/lib/libkadath.a) so that the FUKA initial data is compatible.

Would you have suggestions on the cleanest way to make the ET KadathThorn and KadathImporter use my external Kadath library? Is there a recommended workflow for this?

Thanks in advance for your help!

Bests,

Fatemeh Nouri