feat: spack install shall default to nproc [TBD]

dedal/cli/spack_manager_api.py

@@ -19,6 +19,7 @@ import os
 from pathlib import Path
 import click
 import jsonpickle
+import multiprocessing
 
 from dedal.bll.SpackManager import SpackManager
 from dedal.bll.cli_utils import save_config, load_config
@@ -155,7 +156,7 @@ def concretize(ctx: click.Context):
 
 
 @cli.command()
-@click.option('--jobs', type=int, default=2, help='Number of parallel jobs for spack installation')
+@click.option('--jobs', type=int, default=multiprocessing.cpu_count(), help='Number of parallel jobs for spack installation')
 @click.pass_context
 def install_packages(ctx: click.Context, jobs):
     """Installs spack packages present in the spack environment defined in configuration."""