enable kHashSearch for blocktable in db_bench
Summary: add a flag called use_hash_search in db_bench Test Plan: make all check ./db_bench --use_hash_search=1 Reviewers: ljin, haobo, yhchiang, sdong Reviewed By: sdong Subscribers: igor, dhruba Differential Revision: https://reviews.facebook.net/D20067
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@ -538,6 +538,9 @@ DEFINE_string(memtablerep, "skip_list", "");
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DEFINE_int64(hash_bucket_count, 1024 * 1024, "hash bucket count");
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DEFINE_bool(use_plain_table, false, "if use plain table "
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"instead of block-based table format");
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DEFINE_bool(use_hash_search, false, "if use kHashSearch "
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"instead of kBinarySearch. "
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"This is valid if only we use BlockTable");
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DEFINE_string(merge_operator, "", "The merge operator to use with the database."
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"If a new merge operator is specified, be sure to use fresh"
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@ -1624,7 +1627,7 @@ class Benchmark {
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options.compaction_style = FLAGS_compaction_style_e;
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options.block_size = FLAGS_block_size;
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options.filter_policy = filter_policy_;
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if (FLAGS_use_plain_table) {
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if (FLAGS_prefix_size != 0) {
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options.prefix_extractor.reset(
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NewFixedPrefixTransform(FLAGS_prefix_size));
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}
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@ -1685,8 +1688,17 @@ class Benchmark {
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if (bloom_bits_per_key < 0) {
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bloom_bits_per_key = 0;
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}
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options.table_factory = std::shared_ptr<TableFactory>(
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options.table_factory.reset(
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NewPlainTableFactory(FLAGS_key_size, bloom_bits_per_key, 0.75));
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} else {
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BlockBasedTableOptions block_based_options;
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if (FLAGS_use_hash_search) {
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block_based_options.index_type = BlockBasedTableOptions::kHashSearch;
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} else {
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block_based_options.index_type = BlockBasedTableOptions::kBinarySearch;
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}
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options.table_factory.reset(
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NewBlockBasedTableFactory(block_based_options));
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}
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if (FLAGS_max_bytes_for_level_multiplier_additional_v.size() > 0) {
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if (FLAGS_max_bytes_for_level_multiplier_additional_v.size() !=
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