In this tutorial, we assume the user installed Cocoa via the Conda installation method, and the name of the Conda environment is cocoa. We also presume the user's terminal is in the folder where Cocoa was cloned.
1️⃣ Step 1 of 6: activate the Conda Cocoa environment
$ conda activate cocoa
2️⃣ Step 2 of 6: go to the project folder (./cocoa/Cocoa/projects) and clone the Cosmolike LSST-Y1 project:
$(cocoa) cd ./cocoa/Cocoa/projects
$(cocoa) git clone --depth 1 https://github.com/CosmoLike/cocoa_des_y3.git des_y3
--depth 1; they should also authenticate to GitHub via SSH keys:
$(cocoapy38) git clone [email protected]:CosmoLike/cocoa_des_y3.git des_y3
By convention, the Cosmolike Organization hosts a Cobaya-Cosmolike project named XXX at CosmoLike/cocoa_XXX. However, our scripts and YAML files assume the removal of the cocoa_ prefix when cloning the repository.
3️⃣ Step 3 of 6: go back to the Cocoa main folder, and activate the private python environment
$(cocoapy38) cd ../
$(cocoapy38) source start_cocoa
LD_LIBRARY_PATH and PYTHONPATH paths.
4️⃣ Step 4 of 6: compile the project
$(cocoapy38)(.local) source ./projects/des_y3/scripts/compile_des_y3
5️⃣ Step 5 of 6: select the number of OpenMP cores
$(cocoapy38)(.local) export OMP_PROC_BIND=close; export OMP_NUM_THREADS=4
5️⃣ Step 6 of 6: run a template YAML file
One model evaluation:
$(cocoapy38)(.local) mpirun -n 1 --oversubscribe --mca btl vader,tcp,self --bind-to core:overload-allowed --rank-by core --map-by numa:pe=${OMP_NUM_THREADS} cobaya-run ./projects/des_y3/EXAMPLE_EVALUATE1.yaml -f
MCMC:
$(cocoapy38)(.local) mpirun -n 4 --oversubscribe --mca btl vader,tcp,self --bind-to core:overload-allowed --rank-by core --map-by numa:pe=${OMP_NUM_THREADS} cobaya-run ./projects/des_y3/EXAMPLE_MCMC1.yaml -f
des_y3 folder from the project folder without running stop_cocoa first; otherwise, Cocoa will have ill-defined soft links at Cocoa/cobaya/cobaya/likelihoods/ , Cocoa/external_modules/code/ and Cocoa/external_modules/data/