Improve dudect test with cropped time analysis#280
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jserv
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Check https://aeb.win.tue.nl/linux/lk/lk-8.html carefully:
Don't put the bullets. Instead, use complete sentences.
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| /* do a t-test on the execution time */ | ||
| t_push(t, difference, classes[i]); | ||
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| // t-test on cropped execution times, for several cropping thresholds. |
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Always use C-style comments.
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| return *a - *b; | ||
| } | ||
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| static void prepare_percentiles(int64_t *exec_times, int64_t *percentiles) |
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Show mathematical evidences here.
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The original dudect collect all execution times and perform t-tests, which may be affected by outliers. The outliers could be caused by context switches, interrupts, or other system activities. This patch introduces percentile-based cropping to remove outliers. The patch adds a new function "prepare_percentiles()" to compute thresholds using an complementary exponential decay scale. The function is called before the test starts. The patch modifies "update_statistics()" to perform t-tests on cropped execution times by filtering out the outliers.
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The original dudect collect all execution times and perform t-tests,
which may be affected by outliers. The outliers could be caused by
context switches, interrupts, or other system activities. This patch
introduces percentile-based cropping to remove outliers.
The patch adds a new function "prepare_percentiles()" to compute
thresholds using an complementary exponential decay scale. The function
is called before the test starts.
The patch modifies "update_statistics()" to perform t-tests on cropped
execution times by filtering out the outliers.
Change-Id: Ieba005a990b122785ce931fe1364adf81dd9802a