bench/gen_bench_expectations.py - Issue 323373002: Narrowed expectation margins noticeably

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Unified Diff: bench/gen_bench_expectations.py

Issue 323373002: Narrowed expectation margins noticeably (Closed) Base URL: https://skia.googlesource.com/skia.git@master

Patch Set: Changed formula more Created 6 years, 6 months ago

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Index: bench/gen_bench_expectations.py

diff --git a/bench/gen_bench_expectations.py b/bench/gen_bench_expectations.py

index 1634914718f2237e6eb1f9d9ef3700bb6a386e27..674309de83ac68f20e4b91ac0d24cee9b43db32e 100644

--- a/bench/gen_bench_expectations.py

+++ b/bench/gen_bench_expectations.py

@@ -49,7 +49,7 @@ def compute_ranges(benches):

avg = sum(benches) / len(benches)

squared_avg = avg ** 2

avg_sum_squared = sum([bench**2 for bench in benches])/len(benches)

- std_dev = (abs(avg_sum_squared - squared_avg) + 0.05*abs(avg)) ** 0.5

+ std_dev = (abs(avg_sum_squared - squared_avg) + 0.0001*abs(avg**2)) ** 0.5

# If the results are normally distributed, 2 standard deviations

# captures something like ~95% of the possible range of results I think

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