Use std::stable_sort instead of std::sort everywhere#655
Merged
costamag merged 1 commit intolsils:masterfrom Jul 14, 2024
Merged
Use std::stable_sort instead of std::sort everywhere#655costamag merged 1 commit intolsils:masterfrom
std::stable_sort instead of std::sort everywhere#655costamag merged 1 commit intolsils:masterfrom
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Test results currently depend on how compare-equal elements are sorted by `std::sort`'s`unstable sort. Defaulting to `std::stable_sort` avoids that problem and generally increases the determinism of the code, which is good. If there are specific cases where the (fairly small) performance overhead of stable sorting is a concern, those can be switched back to unstable sorting as an optimization, but first one would need to verify that that doesn't break the tests (e.g., by running the tests with a shuffle before each call to unstable sort). Resolves lsils#654
costamag
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Jul 14, 2024
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Verified no significant performance degradation in the experiments when doing the suggested replacement. |
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Dec 15, 2025
Test results currently depend on how compare-equal elements are sorted by `std::sort`'s`unstable sort. Defaulting to `std::stable_sort` avoids that problem and generally increases the determinism of the code, which is good. If there are specific cases where the (fairly small) performance overhead of stable sorting is a concern, those can be switched back to unstable sorting as an optimization, but first one would need to verify that that doesn't break the tests (e.g., by running the tests with a shuffle before each call to unstable sort). Resolves lsils#654
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Test results currently depend on how compare-equal elements are sorted by
std::sort's unstable sort. Defaulting tostd::stable_sortavoids that problem and generally increases the determinism of the code, which is good.If there are specific cases where the (fairly small) performance overhead of stable sorting is a concern, those can be switched back to unstable sorting as an optimization, but first one would need to verify that that doesn't break the tests (e.g., by running the tests with a shuffle before each call to unstable sort).
Resolves #654