PERF/CI: fix benchmark import error + run asv check on all builds (pandas-dev#26575)

* PERF: fix asv import error

* CI: run asv check on all builds

* PERF: since TimeGrouper was removed, remove benchmarks concerning it

* PERF: fix benchmark frame_methods.Iteration.mem_itertuples_to_list

The runtime of the benchmark increased in asv 0.4 (which has upgraded
asv.extern.asizeof), so bump the timeout upward.

Author: pv

asv_bench/benchmarks/frame_methods.py

@@ -96,6 +96,8 @@ def time_dict_rename_both_axes(self):
 
 
 class Iteration:
+    # mem_itertuples_* benchmarks are slow
+    timeout = 120
 
     def setup(self):
         N = 1000

asv_bench/benchmarks/groupby.py

@@ -1,12 +1,11 @@
 from functools import partial
 from itertools import product
 from string import ascii_letters
-import warnings
 
 import numpy as np
 
 from pandas import (
-    Categorical, DataFrame, MultiIndex, Series, TimeGrouper, Timestamp,
+    Categorical, DataFrame, MultiIndex, Series, Timestamp,
     date_range, period_range)
 import pandas.util.testing as tm
 
@@ -301,10 +300,6 @@ def setup(self):
     def time_multi_size(self):
         self.df.groupby(['key1', 'key2']).size()
 
-    def time_dt_timegrouper_size(self):
-        with warnings.catch_warnings(record=True):
-            self.df.groupby(TimeGrouper(key='dates', freq='M')).size()
-
     def time_category_size(self):
         self.draws.groupby(self.cats).size()
 

asv_bench/benchmarks/io/parsers.py

@@ -1,7 +1,11 @@
 import numpy as np
 
-from pandas._libs.tslibs.parsing import (
-    _concat_date_cols, _does_string_look_like_datetime)
+try:
+    from pandas._libs.tslibs.parsing import (
+        _concat_date_cols, _does_string_look_like_datetime)
+except ImportError:
+    # Avoid whole benchmark suite import failure on asv (currently 0.4)
+    pass
 
 
 class DoesStringLookLikeDatetime(object):

azure-pipelines.yml

@@ -97,10 +97,11 @@ jobs:
   - script: |
       export PATH=$HOME/miniconda3/bin:$PATH
       source activate pandas-dev
+      cd asv_bench
+      asv check -E existing
       git remote add upstream https://github.com/pandas-dev/pandas.git
       git fetch upstream
       if git diff upstream/master --name-only | grep -q "^asv_bench/"; then
-          cd asv_bench
           asv machine --yes
           ASV_OUTPUT="$(asv dev)"
           if [[ $(echo "$ASV_OUTPUT" | grep "failed") ]]; then