From 946e95ce46581bc718049ce6dae9c33ced24bfa3 Mon Sep 17 00:00:00 2001 From: Håvard Pettersen Date: Thu, 2 May 2024 15:41:03 +0000 Subject: when is actual non-strict array lookup faster ... than forced strict btree posting list --- .../iterator_benchmark/iterator_benchmark_test.cpp | 38 +++++++++++++++------- 1 file changed, 27 insertions(+), 11 deletions(-) diff --git a/searchlib/src/tests/queryeval/iterator_benchmark/iterator_benchmark_test.cpp b/searchlib/src/tests/queryeval/iterator_benchmark/iterator_benchmark_test.cpp index d8fcd613fc3..2977664f6ad 100644 --- a/searchlib/src/tests/queryeval/iterator_benchmark/iterator_benchmark_test.cpp +++ b/searchlib/src/tests/queryeval/iterator_benchmark/iterator_benchmark_test.cpp @@ -318,26 +318,26 @@ struct Sample { } }; -double find_crossover(const char *type, const auto &calculate_at, double delta) { +double find_crossover(const char *type, const char *a, const char *b, const auto &calculate_at, double delta) { double min = delta; double max = 1.0; fprintf(stderr, "looking for %s crossover in the range [%g, %g]...\n", type, min, max); auto at_min = calculate_at(min); auto at_max = calculate_at(max); - fprintf(stderr, " before: [%s, %s], after: [%s, %s]\n", - at_min.first.str().c_str(), at_max.first.str().c_str(), - at_min.second.str().c_str(), at_max.second.str().c_str()); - auto best_before = [](auto values) { return (values.first < values.second); }; - if (best_before(at_min) == best_before(at_max)) { + fprintf(stderr, " %s: [%s, %s], %s: [%s, %s]\n", + a, at_min.first.str().c_str(), at_max.first.str().c_str(), + b, at_min.second.str().c_str(), at_max.second.str().c_str()); + auto a_best = [](auto values) { return (values.first < values.second); }; + if (a_best(at_min) == a_best(at_max)) { fprintf(stderr, " NO %s CROSSOVER FOUND\n", type); return 0.0; } while (max > (min + delta)) { double x = (min + max) / 2.0; auto at_x = calculate_at(x); - fprintf(stderr, " best@%g: %s (%s vs %s)\n", x, best_before(at_x) ? "before" : "after", + fprintf(stderr, " best@%g: %s (%s vs %s)\n", x, a_best(at_x) ? a : b, at_x.first.str().c_str(), at_x.second.str().c_str()); - if (best_before(at_min) == best_before(at_x)) { + if (a_best(at_min) == a_best(at_x)) { min = x; at_min = at_x; } else { @@ -410,11 +410,11 @@ void analyze_crossover(BenchmarkBlueprintFactory &fixed, std::function results; std::vector names; names.push_back("time crossover"); - results.push_back(find_crossover("TIME", combine(estimate_AND_time_ms), delta)); + results.push_back(find_crossover("TIME", "before", "after", combine(estimate_AND_time_ms), delta)); names.push_back("cost crossover"); - results.push_back(find_crossover("COST", combine(calculate_AND_cost), delta)); + results.push_back(find_crossover("COST", "before", "after", combine(calculate_AND_cost), delta)); names.push_back("abs_est crossover"); - results.push_back(find_crossover("ABS_EST", combine(first_abs_est), delta)); + results.push_back(find_crossover("ABS_EST", "before", "after", combine(first_abs_est), delta)); sample_at("COST", combine(calculate_AND_cost), results, names); sample_at("TIME", combine(estimate_AND_time_ms), results, names); } @@ -1026,6 +1026,22 @@ TEST(IteratorBenchmark, analyze_btree_vs_bitvector_iterators_strict) run_benchmarks(setup); } +TEST(IteratorBenchmark, btree_vs_array_nonstrict_crossover) { + for (double hit_ratio: { 0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, + 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, + 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, + 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1.0}) + { + auto btree = make_blueprint_factory(int32_array_fs, QueryOperator::Term, num_docs, 0, hit_ratio, 1, false); + auto array = make_blueprint_factory( int32_array, QueryOperator::Term, num_docs, 0, hit_ratio, 1, false); + auto time_ms = [&](auto &bpf, double in_flow) { + return Sample(benchmark_search(bpf, num_docs + 1, false, false, false, in_flow, PlanningAlgo::Cost).time_ms); + }; + auto calculate_at = [&](double in_flow) { return std::make_pair(time_ms(*btree, in_flow), time_ms(*array, in_flow)); }; + fprintf(stderr, "btree/array crossover@%5.3f: %8.6f\n", hit_ratio, find_crossover("TIME", "btree", "array", calculate_at, 0.0001)); + } +} + int main(int argc, char **argv) { ::testing::InitGoogleTest(&argc, argv); int res = RUN_ALL_TESTS(); -- cgit v1.2.3