code_saturne User's Forum

Hi Yvan,

Works perfectly now that I installed code_saturne on a /shared partition between all nodes.
I can just submit code_saturne run through sbatch and performance is improving a lot while running on multiple nodes !

Leveraging AWS's fsx Lustre partition type, I gained 25% performance over 512 ...

Hi Yvan,

I think I have a configuration issue between SLURM on the nodes and mpi inside the container.
For now, I will try to install code_saturne directly onto the nodes since this cluster will be used exclusively for this purpose...

I'll keep you updated.

Thanks for the advices !

Best regards ...

Hi Yvan,

Thank you for your answer.

However I still don't completely get it.

I set up the config file with a custom batch.SLURM file that i bind with the singularity container for code_saturne to find.

#SBATCH --nodes=2
#SBATCH --ntasks-per-node=64
#SBATCH --cpus-per-task=1
#SBATCH --time=0:10 ...

Hi Yvan,

I finally set up the whole thing on an AWS cluster using graviton cpus as suggested.
But I am now facing a challenge launching code_saturne on multiple nodes.

Here is what i have :
AWS cluster with head node and 10 compute nodes of 64 cores each (no multithread). I used C6gn instances as ...

Hi Yvan,

I will try on next install
But everything is working just fine at the moment, so I will keep the solution mentionned before.
I will give an update when trying your fix.

Best regards,
Antoine

Hi,

I'm wondering if anyone has ever tried to run code_saturne simulations on an Azure Batch cluster or Google Cloud HPC ?
I'm not exactly sure how to set up the whole thing, but before diving into some time-consuming trial and error, I wanted to know if there was any point doing so...

I am ...

Hello,

Do you mean using this flag when running a simulation or when installing code_saturne ?

Best regards,
Antoine

Hi Yvan,

I got it to work with the following commands :

code_saturne compile --libs=-lgdal --source=./SRC --dest=./DATA
cp ./DATA/* ./RESU/test/
code_saturne run --no-stage --id test

I tried again on code_saturne v7 which worked just fine before i updated to Debian 12, and it does not work ...

Hello Yvan,

You can find attached te output of the ldd command.

regarding GDAL : It is the right library.

Is there a way i can launch computation with the created cs_solver in the SRC directory ?

Best regards,
Antoine

Hi,

I can't seem to understand why the compile stage fails whereas GDAL is installed on my computer.


/usr/bin/ld: cs_user_initialization.o: in function `cs_user_initialization':
cs_user_initialization.c:(.text+0x6b): undefined reference to `GDALAllRegister'
/usr/bin/ld: cs_user_initialization.c ...