Hi all,

This is Florin Papa from the Server Languages Optimizations Team at Intel Corporation.

The patch submitted here solves a crash occurring on Python 2.7 after running pybench from perf.py (python perf.py -r -b pybench base_python modified_python). The error appears when trying to display the results of the run because the PyBenchBenchmarkResult class does not include the attribute "always_display".

Here is the error message received:
File "../benchmarks/perf.py", line 2574, in main
    if result.always_display:
AttributeError: 'PyBenchBenchmarkResult' object has no attribute 'always_display'

To apply the patch please follow these steps:

hg clone https://hg.python.org/benchmarks
cd benchmarks/
copy fix_pybench_results.patch to the current directory
hg import --no-commit fix_pybench_results.patch

Thank you,
Florin Papa

Thanks for your bug report.

I fixed the issue differently, by adding a base class to benchmark result classes. I also implemented the format output format for pybench.

By the way, perf.py badly handles errors :-/ CSV output and table output fail to handle errors.

pybench output with my change:
*******************
$ ./perf.py -f -r -b pybench python2.7 python2.7 
(...)

### pybench ###
Min: 285 -> 284: 1.00x faster
Avg: 289 -> 292: 1.01x slower


$ ./perf.py -f --csv=pybench.csv -r -b pybench python2.7 python2.7 
(...)

### pybench ###
Min: 283 -> 286: 1.01x slower
Avg: 287 -> 290: 1.01x slower


$ cat pybench.csv
Benchmark,Base,Changed
pybench,283.000000,286.000000


$ ./perf.py -f -O table -r -b pybench python2.7 python2.7 
(...)
+-----------+-----------+-----------+--------------+
| Benchmark | python2.7 | python2.7 | Change       |
+===========+===========+===========+==============+
| pybench   | 288.0     | 289.0     | 1.00x slower |
+-----------+-----------+-----------+--------------+
*******************

New changeset e77ed7d18a68 by Victor Stinner in branch 'default':
Issue #25721: Fixes for pybench
https://hg.python.org/benchmarks/rev/e77ed7d18a68

Is it ok for you Florin? (Can I close the issue?)

Yes, thank you for fixing this.