[benchmarking] add timestamps for logging in process_perf_results

The logs printed by process_perf_results.py do not have timestamps. This
CL added the timestamps by updating the config for python logging.

Bug: chromium:1035935
Change-Id: I824dcc4c594904ff7c2437248679df9e503052ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985219
Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728788}

tools/perf/process_perf_results.py

@@ -17,6 +17,11 @@ import tempfile
 import time
 import uuid
 
+logging.basicConfig(
+    level=logging.INFO,
+    format='(%(levelname)s) %(asctime)s pid=%(process)d'
+           '  %(module)s.%(funcName)s:%(lineno)d  %(message)s')
+
 from core import path_util
 from core import upload_results_to_perf_dashboard
 from core import results_merger
@@ -172,7 +177,8 @@ def _handle_perf_json_test_results(
             # Output is null meaning the test didn't produce any results.
             # Want to output an error and continue loading the rest of the
             # test results.
-            print('No results produced for %s, skipping upload' % directory)
+            logging.warning(
+                'No results produced for %s, skipping upload' % directory)
             continue
           if json_results.get('version') == 3:
             # Non-telemetry tests don't have written json results but
@@ -193,7 +199,7 @@ def _handle_perf_json_test_results(
       if not enabled:
         # We don't upload disabled benchmarks or tests that are run
         # as a smoke test
-        print(
+        logging.info(
             'Benchmark %s ran no tests on at least one shard' % benchmark_name)
         continue
       benchmark_enabled_map[benchmark_name] = True
@@ -410,7 +416,7 @@ def _upload_individual(
       results_filename = os.path.join(directories[0], 'perf_results.json')
 
     results_size_in_mib = os.path.getsize(results_filename) / (2 ** 20)
-    print('Uploading perf results from %s benchmark (size %s Mib)' %
+    logging.info('Uploading perf results from %s benchmark (size %s Mib)' %
           (benchmark_name, results_size_in_mib))
     with open(output_json_file, 'w') as oj:
       upload_return_code = _upload_perf_results(
@@ -548,7 +554,7 @@ def _write_perf_data_to_logfile(benchmark_name, output_file,
       try:
         results = json.load(f)
       except ValueError:
-        print('Error parsing perf results JSON for benchmark  %s' %
+        logging.error('Error parsing perf results JSON for benchmark  %s' %
               benchmark_name)
     if results:
       try:
@@ -556,12 +562,12 @@ def _write_perf_data_to_logfile(benchmark_name, output_file,
         json.dump(results, output_json_file,
                   indent=4, separators=(',', ': '))
       except ValueError as e:
-        print('ValueError: "%s" while dumping output to logdog' % e)
+        logging.error('ValueError: "%s" while dumping output to logdog' % e)
       finally:
         output_json_file.close()
       viewer_url = output_json_file.get_viewer_url()
   else:
-    print("Perf results JSON file doesn't exist for benchmark %s" %
+    logging.warning("Perf results JSON file doesn't exist for benchmark %s" %
           benchmark_name)
 
   base_benchmark_name = benchmark_name.replace('.reference', '')
@@ -590,12 +596,12 @@ def _write_perf_data_to_logfile(benchmark_name, output_file,
 
 
 def print_duration(step, start, end):
-  print('Duration of %s: %d seconds' % (step, end - start))
+  logging.info('Duration of %s: %d seconds' % (step, end - start))
 
 
 def main():
   """ See collect_task.collect_task for more on the merge script API. """
-  print(sys.argv)
+  logging.info(sys.argv)
   parser = argparse.ArgumentParser()
   # configuration-name (previously perf-id) is the name of bot the tests run on
   # For example, buildbot-test is the name of the android-go-perf bot