User Forum of Software BASEMENT / General

BASEHPC GPU Support - urgent question

dummy@example.com (sua87) — Mon, 17 Nov 2025 14:13:47 +0000

So for some odd reason the GPU is now working just fine (after the weekend) without having changed anything. Sorry for any possible inconvenience caused.

Maximum number of nodes per node string

dummy@example.com (Lukas Vonwiller) — Mon, 20 Oct 2025 08:11:22 +0000

Hi freidro

The number of nodes per nodestring was increased from 40 to 200. But it seems that at various places in the user manual this was not adopted.

Hope this helps!
Br, Lukas

Normal vectors in setup file

dummy@example.com (ClaireGilder) — Wed, 03 Sep 2025 20:44:39 +0000

Thanks for the clarification!

Underground intersection

dummy@example.com (Giampietro) — Wed, 20 Aug 2025 07:46:36 +0000

Hi everyone!

Is it possible in the HPC module to simulate an intersection between two channels, one of which runs underground—for example, an inverted siphon (siphon culvert)?

Thank you in advance!

Giampietro

Memory usage on GPU increased in Version 4.1

dummy@example.com (Lukas Vonwiller) — Thu, 03 Jul 2025 10:08:59 +0000

Dear developers

I observed that from Basement Version 3.2 to Version 4.1 in a purely hydraulic case the memory usage on the GPU increased around 58% (in my specific case from 2.97 GB to 4.70 GB). What could be the reason for this?

Best regards
Lukas

Use in GLOF

dummy@example.com (UP) — Wed, 26 Mar 2025 10:52:16 +0000

Has anyone applied Basement in GLOF modeling? It should be like avalanche entering the glacial lake and overtopping the moraine. We should capture the overtopping phenomenon and amplitude of the waves.

Performance drop

dummy@example.com (Matthias Bürgler) — Wed, 12 Jun 2024 09:12:51 +0000

Hi Matteo,

Do I understand correctly that this occurs only with cudaO backends?

Best regards,
Matthias

BASEMENT v4.0.1 Mass balance problems

dummy@example.com (Matteo Facchini) — Wed, 15 May 2024 13:57:19 +0000

Hi Liliana,
although this is not encouraged, you can deactivate the safe_mode in the hydraulics parameters and also run your simulations with single precision. This should be enough.
Anyway, try and understand which cells are causing the mass balance problems and try to correct their level/slope to avoid the mass balance problem.
Cheers
Matteo

BASEMENT crashing

dummy@example.com (Matteo Facchini) — Tue, 13 Feb 2024 10:54:45 +0000

Hi Marco,
actually the .xdmf file you sent me is wrong, correcting the header as I wrote previously, and as it is reported here allowed me to open it in QGIS. Beside that, even without the correction to the xdmf, I could open your simulation results with paraview just fine.

Another small side-note: I think you could change you simulation.json file, to give the parameter 'out' another value. Giving 0 means that only the 'end' timestep will be registered.
I tried it, changed out to 3600 s, then I re-run the sim, modified the xdmf as mentioned before, and could open the rsults in QGIS as well.

Cheers,
Matteo

BASEMENT v4

dummy@example.com (Matteo Facchini) — Thu, 17 Aug 2023 09:36:20 +0000

Hi marc
i can only address the second and third of your points:

- basemesh: check this link
- the mesh could be wrong for many different reasons. Lately I found out that for very long stringdefs sometimes the vertices are not in the correct order...it is hard to say what your problem could be.

I suggest you write a topic of each of your issues.

Cheers
Matteo

Different in- and outflow

dummy@example.com (NumericalSam) — Wed, 09 Aug 2023 12:57:18 +0000

Hi Patrick

You could use a linked boundary condition.
Check Figure 1.1 in http://people.ee.ethz.ch/~basement/base … v3-2-0.pdf --> weir

For this you can specify a depth-discharge relation at the entry of the underground section and link it to the entry downstream.
Limitations:
1. the transfer occurs immediately, so if the underground section is long, you might create a fast-forwarding of the flood.
2. you have to find a reasonable depth-discharge relation (consider pressurized flow)

You also could simulate the underground section if the situation allows it. Could be closer to reality if not completely inundated and flow paths do not cross the underground section.

Regards, Sam

BASEMENT rpm package for CentOS

dummy@example.com (Matthias Bürgler) — Wed, 19 Apr 2023 11:41:45 +0000

Hi Hassaan,

Unfortunately, we are not able to provide rpm packages.

Best regards,
Matthias

Run Basement simulation with virtual machine

dummy@example.com (NumericalSam) — Tue, 07 Feb 2023 07:23:59 +0000

Hi Giovanni

may I ask for the reason why you're running BASEMENT on a virtual machine instead of directly on your machine? I'd expect some major performance losses from this, no? Or are there any advantages of doing so?

In order to check compatibility with your graphics card I'd suggest you try to run the model directly on your machine instead of the VM.

Best, Sam

ERROR: out of range (4294967295>=0)

dummy@example.com (JBarreiro) — Tue, 24 May 2022 17:19:05 +0000

NumericalSam wrote:

Hi Joao
I recently added some clarification on that issue, please check out this thread: https://forum.basement.ethz.ch/viewtopic.php?id=5438
Best, Sam

I think my error is like this one: https://forum.basement.ethz.ch/viewtopi … 6629#p6629

I checked for your suggestions regarding material ID, breaklines/stringdefs and found no issues...

Multi GPU

dummy@example.com (qtheiler) — Wed, 07 Jul 2021 04:31:09 +0000

Hi developper team,

I have try to add a second GPU on my computer (2080TI + 3070). Do you know if Basement 3.x can run on 2 GPU and use the maximal quantity of ressource? And is there any possibility to choose the GPU before lauching the model calculation?

Cheers,

Quentin