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ircd::db: Enable block alignment based on compression; Enable O_DIRECT writes.

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This commit is contained in:
Jason Volk 2018-11-29 15:41:42 -08:00
parent 1365bed78c
commit 60dd8c0eea
1 changed files with 53 additions and 54 deletions
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107
ircd/db.cc
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@ -877,8 +877,8 @@ try
opts.use_direct_reads = ircd::nodirect? false:
fs::exists(direct_io_test_file_path());
opts.use_direct_io_for_flush_and_compaction = false;
//opts.use_direct_io_for_flush_and_compaction = opts.use_direct_reads;
//opts.use_direct_io_for_flush_and_compaction = false;
opts.use_direct_io_for_flush_and_compaction = opts.use_direct_reads;
#ifdef RB_DEBUG
opts.dump_malloc_stats = true;
@ -1556,58 +1556,6 @@ ircd::db::database::column::column(database &d,
// Set the compaction filter
this->options.compaction_filter = &this->cfilter;
//
// Table options
//
// Block based table index type.
table_opts.format_version = 3; // RocksDB >= 5.15 compat only; otherwise use 2.
table_opts.index_type = rocksdb::BlockBasedTableOptions::kTwoLevelIndexSearch;
table_opts.partition_filters = true;
table_opts.use_delta_encoding = true;
table_opts.enable_index_compression = false;
table_opts.read_amp_bytes_per_bit = 8;
// Specify that index blocks should use the cache. If not, they will be
// pre-read into RAM by rocksdb internally. Because of the above
// TwoLevelIndex + partition_filters configuration on RocksDB v5.15 it's
// better to use pre-read except in the case of a massive database.
table_opts.cache_index_and_filter_blocks = true;
table_opts.cache_index_and_filter_blocks_with_high_priority = false;
table_opts.pin_top_level_index_and_filter = false;
table_opts.pin_l0_filter_and_index_blocks_in_cache = false;
// Setup the block size
table_opts.block_size = this->descriptor->block_size;
table_opts.metadata_block_size = this->descriptor->meta_block_size;
table_opts.block_size_deviation = 50;
table_opts.block_align = false; // Doesn't work w/ compression.
// Setup the cache for assets.
const auto &cache_size(this->descriptor->cache_size);
if(cache_size != 0)
table_opts.block_cache = std::make_shared<database::cache>(this->d, this->stats, cache_size);
// Setup the cache for compressed assets.
const auto &cache_size_comp(this->descriptor->cache_size_comp);
if(cache_size_comp != 0)
table_opts.block_cache_compressed = std::make_shared<database::cache>(this->d, this->stats, cache_size_comp);
// Setup the bloom filter.
const auto &bloom_bits(this->descriptor->bloom_bits);
if(bloom_bits)
table_opts.filter_policy.reset(rocksdb::NewBloomFilterPolicy(bloom_bits, false));
// Tickers::READ_AMP_TOTAL_READ_BYTES / Tickers::READ_AMP_ESTIMATE_USEFUL_BYTES
//table_opts.read_amp_bytes_per_bit = 8;
// Finally set the table options in the column options.
this->options.table_factory.reset(rocksdb::NewBlockBasedTableFactory(table_opts));
//
// Misc options
//
//this->options.paranoid_file_checks = true;
// More stats reported by the rocksdb.stats property.
@ -1639,6 +1587,57 @@ ircd::db::database::column::column(database &d,
//this->options.disable_auto_compactions = true;
//this->options.level_compaction_dynamic_level_bytes = true;
//
// Table options
//
// Block based table index type.
table_opts.format_version = 3; // RocksDB >= 5.15 compat only; otherwise use 2.
table_opts.index_type = rocksdb::BlockBasedTableOptions::kTwoLevelIndexSearch;
table_opts.partition_filters = true;
table_opts.use_delta_encoding = true;
table_opts.enable_index_compression = false;
table_opts.read_amp_bytes_per_bit = 8;
// Specify that index blocks should use the cache. If not, they will be
// pre-read into RAM by rocksdb internally. Because of the above
// TwoLevelIndex + partition_filters configuration on RocksDB v5.15 it's
// better to use pre-read except in the case of a massive database.
table_opts.cache_index_and_filter_blocks = true;
table_opts.cache_index_and_filter_blocks_with_high_priority = false;
table_opts.pin_top_level_index_and_filter = false;
table_opts.pin_l0_filter_and_index_blocks_in_cache = false;
// Setup the block size
table_opts.block_size = this->descriptor->block_size;
table_opts.metadata_block_size = this->descriptor->meta_block_size;
table_opts.block_size_deviation = 50;
// Block alignment doesn't work if compression is enabled for this
// column. If not, we want block alignment for direct IO.
table_opts.block_align = this->options.compression == rocksdb::kNoCompression;
// Setup the cache for assets.
const auto &cache_size(this->descriptor->cache_size);
if(cache_size != 0)
table_opts.block_cache = std::make_shared<database::cache>(this->d, this->stats, cache_size);
// Setup the cache for compressed assets.
const auto &cache_size_comp(this->descriptor->cache_size_comp);
if(cache_size_comp != 0)
table_opts.block_cache_compressed = std::make_shared<database::cache>(this->d, this->stats, cache_size_comp);
// Setup the bloom filter.
const auto &bloom_bits(this->descriptor->bloom_bits);
if(bloom_bits)
table_opts.filter_policy.reset(rocksdb::NewBloomFilterPolicy(bloom_bits, false));
// Tickers::READ_AMP_TOTAL_READ_BYTES / Tickers::READ_AMP_ESTIMATE_USEFUL_BYTES
//table_opts.read_amp_bytes_per_bit = 8;
// Finally set the table options in the column options.
this->options.table_factory.reset(rocksdb::NewBlockBasedTableFactory(table_opts));
log::debug
{
log, "schema '%s' column [%s => %s] cmp[%s] pfx[%s] lru:%s:%s bloom:%zu %s",