Automatically set and save optimal OpenMP and fusion thresholds

qiskit/providers/aer/aerprovider.py

@@ -21,6 +21,7 @@
 from .backends.statevector_simulator import StatevectorSimulator
 from .backends.unitary_simulator import UnitarySimulator
 from .backends.pulse_simulator import PulseSimulator
+from .profile import profile_performance_options
 
 
 class AerProvider(Provider):
@@ -78,3 +79,9 @@ def backends(self, name=None, filters=None, **kwargs):
 
     def __str__(self):
         return 'AerProvider'
+
+    @staticmethod
+    def optimize_backend_options(min_qubits=10, max_qubits=20, ntrials=10):
+        """Set optimal OpenMP and fusion options for backend."""
+        return profile_performance_options(
+            min_qubits=min_qubits, max_qubits=max_qubits, ntrials=ntrials)

qiskit/providers/aer/backends/aerbackend.py

@@ -32,6 +32,7 @@
 
 from ..aerjob import AerJob
 from ..aererror import AerError
+from ..profile import get_performance_options
 
 # Logger
 logger = logging.getLogger(__name__)
@@ -155,9 +156,23 @@ def run(self,
         else:
             qobj = assemble(circuits, self)
 
-        # Add backend options to the Job qobj
+        profile_num_qubits = None
+        if isinstance(circuits, QasmQobj):
+            profile_num_qubits = qobj.config.n_qubits
+        if isinstance(circuits, list) and len(circuits) > 0 and hasattr(circuits[0], 'num_qubits'):
+            profile_num_qubits = circuits[0].num_qubits
+
+        profiled_options = {}
+        if profile_num_qubits is not None:
+            # Get profiled options for performance
+            gpu = backend_options is not None and 'gpu' in backend_options.get('method', '')
+            profiled_options = get_performance_options(profile_num_qubits, gpu)
+            for run_option in run_options:
+                if run_option in profiled_options:
+                    del profiled_options[run_option]
+
         self._add_options_to_qobj(
-            qobj, backend_options=backend_options, **run_options)
+            qobj, backend_options=backend_options, **profiled_options, **run_options)
 
         # Optional validation
         if validate: