BENCH: fix noisy asv benchmarks that were running on exhausted generators (pandas-dev#26772)

Author: qwhelan

asv_bench/benchmarks/ctors.py

@@ -55,7 +55,14 @@ class SeriesConstructors:
               [False, True],
               ['float', 'int']]
 
+    # Generators get exhausted on use, so run setup before every call
+    number = 1
+    repeat = (3, 250, 10)
+
     def setup(self, data_fmt, with_index, dtype):
+        if data_fmt in (gen_of_str, gen_of_tuples) and with_index:
+            raise NotImplementedError('Series constructors do not support '
+                                      'using generators with indexes')
         N = 10**4
         if dtype == 'float':
             arr = np.random.randn(N)

asv_bench/benchmarks/frame_ctor.py

@@ -72,6 +72,10 @@ class FromRecords:
     params = [None, 1000]
     param_names = ['nrows']
 
+    # Generators get exhausted on use, so run setup before every call
+    number = 1
+    repeat = (3, 250, 10)
+
     def setup(self, nrows):
         N = 100000
         self.gen = ((x, (x * 20), (x * 100)) for x in range(N))