Adds bench expectations to expectations/bench; fixes bench alert test's dependency on script line n…

bench/check_bench_regressions.py

 '''
 Created on May 16, 2011
 
 @author: bungeman
 '''
 import bench_util
 import getopt
 import httplib
 import itertools
 import json
@@ skipping 157 matching lines @@
           ratios.sort(reverse=True)
           li = []
           for ratio in ratios:
               li.extend(exceptions[i][ratio])
           header = '%s benches got slower (sorted by %% difference):' % len(li)
           if i == FASTER:
               header = header.replace('slower', 'faster')
           outputs.extend(['', header] + li)
 
     if outputs:
-        raise Exception('\n'.join(outputs))
+        # Directly raising Exception will have stderr outputs tied to the line
+        # number of the script, so use sys.stderr.write() instead.
+        # Add a trailing newline to supress new line checking errors.
+        sys.stderr.write('\n'.join(['Exception:'] + outputs + ['\n']))
+        exit(1)
 
 
 def main():
     """Parses command line and checks bench expectations."""
     try:
         opts, _ = getopt.getopt(sys.argv[1:],
                                 "a:b:d:e:r:",
                                 "default-setting=")
     except getopt.GetoptError, err:
         print str(err)
@@ skipping 34 matching lines @@
     data_points = bench_util.parse_skp_bench_data(directory, rev, rep)
 
     bench_dict = create_bench_dict(data_points)
 
     if bench_expectations:
         check_expectations(bench_dict, bench_expectations, platform_and_alg)
 
 
 if __name__ == "__main__":
     main()