Reduce risk of CI failures

Author: cburgdorf

tox.ini

@@ -28,7 +28,8 @@ commands=
     rpc-state-homestead: pytest {posargs:tests/trinity/json-fixtures-over-rpc/test_rpc_fixtures.py -k 'GeneralStateTests and not stQuadraticComplexityTest and Homestead'}
     rpc-state-eip150: pytest {posargs:tests/trinity/json-fixtures-over-rpc/test_rpc_fixtures.py -k 'GeneralStateTests and not stQuadraticComplexityTest and EIP150'}
     rpc-state-eip158: pytest {posargs:tests/trinity/json-fixtures-over-rpc/test_rpc_fixtures.py -k 'GeneralStateTests and not stQuadraticComplexityTest and EIP158'}
-    rpc-state-byzantium: pytest {posargs:tests/trinity/json-fixtures-over-rpc/test_rpc_fixtures.py -k 'GeneralStateTests and not stQuadraticComplexityTest and Byzantium'}
+    # The following test seems to consume a lot of memory. Restricting to 3 processes reduces crashes
+    rpc-state-byzantium: pytest -n3 {posargs:tests/trinity/json-fixtures-over-rpc/test_rpc_fixtures.py -k 'GeneralStateTests and not stQuadraticComplexityTest and Byzantium'}
     rpc-state-quadratic: pytest {posargs:tests/trinity/json-fixtures-over-rpc/test_rpc_fixtures.py -k 'GeneralStateTests and stQuadraticComplexityTest'}
     transactions: pytest {posargs:tests/json-fixtures/test_transactions.py}
     vm: pytest {posargs:tests/json-fixtures/test_virtual_machine.py}