- Add asv-regression.conf.json with optimized settings for regression testing
- Enable parallel benchmark execution (2 processes) for faster feedback
- Reduce factor from 1.50 to 1.25 for quicker regression detection
- Reduce number_of_steps from default to 5 for faster convergence
- Skip machine registration if results already exist to avoid redundant setup
- Add comprehensive Behave tests to verify optimization configuration
- Update both benchmark and benchmark_regression nox sessions with parallel flag

These optimizations reduce CI execution time for benchmark regression tests
while maintaining statistical significance for performance regression detection.

ISSUES CLOSED: #10846

@@ -0,0 +16,4 @@
+  },
+  "build_cache_size": 8,
+  "install_cache_size": 8,
+  "timeout": 60,

@@ -0,0 +11,4 @@
+
+@given("the benchmark regression configuration exists")
+def step_regression_config_exists(context: object) -> None:
+    """Verify regression configuration file exists."""

@@ -0,0 +87,4 @@
+
+@then('the session should use "{flag}" flag')
+def step_session_uses_flag(context: object, flag: str) -> None:
+    """Verify the session uses a specific flag."""

@@ -816,0 +817,4 @@
+    Optimized with:
+    - Parallel benchmark execution for faster full suite runs
+    - Caching of environment and build artifacts
+    """

@@ -0,0 +17,4 @@
+  "build_cache_size": 8,
+  "install_cache_size": 8,
+  "timeout": 60,
+  "max_time": 60,

@@ -0,0 +9,4 @@
+from behave import given, then, when
+
+
+@given("the benchmark regression configuration exists")

@@ -0,0 +92,4 @@
+        f"Flag '{flag}' not found in benchmark_regression session"
+    )
+
+

@@ -0,0 +117,4 @@
+    
+    # Extract the benchmark function (not benchmark_regression)
+    match = re.search(
+        r"def benchmark\(session: nox\.Session\):\n(.*?)(?=\n@nox\.session|\ndef benchmark_regression)",

@@ -0,0 +150,4 @@
+    assert regression_steps <= standard_steps, (
+        f"Regression steps ({regression_steps}) should be <= standard ({standard_steps})"
+    )
+

@@ -0,0 +158,4 @@
+    standard_timeout = context.standard_config.get("timeout", float("inf"))
+    regression_timeout = context.regression_config.get("timeout", 0)
+    assert regression_timeout <= standard_timeout, (
+        f"Regression timeout ({regression_timeout}) should be <= standard ({standard_timeout})"

@@ -860,2 +886,4 @@
+    # - --factor=1.25: Reduced from 1.50 for faster regression detection
+    # - --min-run-count=2: Minimum 2 runs per benchmark
     session.run(
         "asv",