Made network carbon data intensity dynamic (#1200)

* Made network carbon data intensity dynamic

* Added N to tests

Author: ArneTR

config.yml.example

@@ -229,6 +229,10 @@ sci:
     # The number worldwide for 2024 is 473
     # The number 334 that comes as default is for Germany from 2024 and comes from https://app.electricitymaps.com/zone/DE/all/yearly
     I: 334
+    # N is not technically part of the SCI, but we keep the value here for better clustering.
+    # N is the network energy intensity per transferred data. It transforms values like GB to kWh
+    # See https://www.green-coding.io/co2-formulas/ for details
+    N: 0.001875
 
 #optimization:
 #  ignore:

lib/phase_stats.py

@@ -266,7 +266,7 @@ def build_and_store_phase_stats(run_id, sci=None):
             # build the network energy
             # network via formula: https://www.green-coding.io/co2-formulas/
             # pylint: disable=invalid-name
-            network_io_in_kWh = Decimal(sum(network_bytes_total)) / 1_000_000_000 * Decimal(0.002651650429449553)
+            network_io_in_kWh = Decimal(sum(network_bytes_total)) / 1_000_000_000 * Decimal(config['sci']['N'])
             network_io_in_uJ = network_io_in_kWh * 3_600_000_000_000
             csv_buffer.write(generate_csv_line(run_id, 'network_energy_formula_global', '[FORMULA]', f"{idx:03}_{phase['name']}", network_io_in_uJ, 'TOTAL', None, None, None, None, None, 'uJ'))
             # co2 calculations

tests/test-config.yml.example

@@ -104,6 +104,7 @@ sci:
   RS: 1
   TE: 181000
   I: 436
+  N: 0.001875
 
 optimization:
   ignore: