Hi all, Long time no see! Apologies if this is not the right place to ask this question. I'm trying to run the benchmarks from speed.pypy.org on my system (just with cpython for now -- there is a chance that Linaro will be doing some work on the performance of Python on ARM at some point), but when I check out https://bitbucket.org/pypy/benchmarks/overview and run "./runner.py --fast" I get this: Running hexiom2... INFO:root:Running /usr/bin/python /home/mwhudson/src/benchmarks/own/hexiom2.py -n 5 INFO:root:Running /usr/bin/python /home/mwhudson/src/benchmarks/own/hexiom2.py -n 5 Traceback (most recent call last): File "./runner.py", line 302, in <module> main(sys.argv[1:]) File "./runner.py", line 283, in main full_store=full_store, branch=branch) File "./runner.py", line 41, in run_and_store results = perf.main(opts, funcs) File "/home/mwhudson/src/benchmarks/unladen_swallow/perf.py", line 1617, in main bench_result = func(base_cmd_prefix, changed_cmd_prefix, options) File "/home/mwhudson/src/benchmarks/benchmarks.py", line 17, in BM return SimpleBenchmark(Measure, *args, **kwds) File "/home/mwhudson/src/benchmarks/unladen_swallow/perf.py", line 462, in SimpleBenchmark return CompareBenchmarkData(base_data, changed_data, options) File "/home/mwhudson/src/benchmarks/unladen_swallow/perf.py", line 736, in CompareBenchmarkData return CompareMultipleRuns(base_times, changed_times, options) File "/home/mwhudson/src/benchmarks/unladen_swallow/perf.py", line 704, in CompareMultipleRuns significant, t_score = IsSignificant(base_times, changed_times) File "/home/mwhudson/src/benchmarks/unladen_swallow/perf.py", line 189, in IsSignificant t_score = TScore(sample1, sample2) File "/home/mwhudson/src/benchmarks/unladen_swallow/perf.py", line 170, in TScore return (avg(sample1) - avg(sample2)) / math.sqrt(error * 2) ZeroDivisionError: float division by zero is this just an artifact of running --fast? It seems the code could probably do with being a bit more robust? Cheers, mwh