correctly read number of solver threads in rule definition

doc/release_notes.rst

@@ -46,6 +46,8 @@ Upcoming Release
   existing heating to urban/rural, residential/services and spatially more
   transparent.
 
+* Bugfix: Correctly read out number of solver threads from configuration file.
+
 
 PyPSA-Eur 0.9.0 (5th January 2024)
 ==================================

rules/common.smk

@@ -13,6 +13,13 @@ for path in helper_source_path:
 from _helpers import validate_checksum
 
 
+def solver_threads(w):
+    solver_options = config["solving"]["solver_options"]
+    option_set = config["solving"]["solver"]["options"]
+    threads = solver_options[option_set].get("threads", 4)
+    return threads
+
+
 def memory(w):
     factor = 3.0
     for o in w.opts.split("-"):

rules/solve_electricity.smk

@@ -25,7 +25,7 @@ rule solve_network:
         + "solve_network/elec_s{simpl}_{clusters}_ec_l{ll}_{opts}_python.log",
     benchmark:
         BENCHMARKS + "solve_network/elec_s{simpl}_{clusters}_ec_l{ll}_{opts}"
-    threads: 4
+    threads: solver_threads
     resources:
         mem_mb=memory,
         walltime=config["solving"].get("walltime", "12:00:00"),

rules/solve_myopic.smk

@@ -137,7 +137,7 @@ rule solve_sector_network_myopic:
         + "elec_s{simpl}_{clusters}_l{ll}_{opts}_{sector_opts}_{planning_horizons}_solver.log",
         python=LOGS
         + "elec_s{simpl}_{clusters}_l{ll}_{opts}_{sector_opts}_{planning_horizons}_python.log",
-    threads: 4
+    threads: solver_threads
     resources:
         mem_mb=config["solving"]["mem"],
         walltime=config["solving"].get("walltime", "12:00:00"),

rules/solve_overnight.smk

@@ -28,10 +28,7 @@ rule solve_sector_network:
         + "logs/elec_s{simpl}_{clusters}_l{ll}_{opts}_{sector_opts}_{planning_horizons}_memory.log",
         python=RESULTS
         + "logs/elec_s{simpl}_{clusters}_l{ll}_{opts}_{sector_opts}_{planning_horizons}_python.log",
-    threads:
-        config["solving"]["solver_options"][
-            config["solving"]["solver"]["options"]
-        ].get("threads", 4)
+    threads: solver_threads
     resources:
         mem_mb=config["solving"]["mem"],
         walltime=config["solving"].get("walltime", "12:00:00"),

rules/solve_perfect.smk

@@ -127,7 +127,7 @@ rule solve_sector_network_perfect:
     output:
         RESULTS
         + "postnetworks/elec_s{simpl}_{clusters}_l{ll}_{opts}_{sector_opts}_brownfield_all_years.nc",
-    threads: 4
+    threads: solver_threads
     resources:
         mem_mb=config["solving"]["mem"],
     shadow: