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ircd::db: Compression hierarchy; increase compaction readahead; table options.

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This commit is contained in:
Jason Volk 2020-09-20 15:50:11 -07:00
parent 5ac0457d55
commit 8155c38f7f
1 changed files with 28 additions and 43 deletions
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71
ircd/db.cc
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@ -1305,7 +1305,7 @@ try
// this size. The compaction process is composing a buffer of this size
// between those writes. Too large a buffer will hog the CPU and starve
// other ircd::ctx's. Too small a buffer will be inefficient.
opts->writable_file_max_buffer_size = 4_MiB; //TODO: conf
opts->writable_file_max_buffer_size = 2_MiB; //TODO: conf
// MUST be 1 (no subcompactions) or rocksdb spawns internal std::thread.
opts->max_subcompactions = 1;
@ -1336,7 +1336,7 @@ try
// For the read-side of the compaction process.
opts->compaction_readahead_size = !opts->use_direct_reads?
512_KiB: //TODO: conf
2_MiB: //TODO: conf
0;
// Use the determined direct io value for writes as well.
@ -2121,7 +2121,7 @@ ircd::db::database::column::column(database &d,
this->options.level0_stop_writes_trigger = 64;
this->options.level0_slowdown_writes_trigger = 48;
this->options.level0_file_num_compaction_trigger =
this->options.compaction_style == rocksdb::kCompactionStyleUniversal? 8: 4;
this->options.compaction_style == rocksdb::kCompactionStyleUniversal? 12: 4;
// Universal compaction mode options
auto &universal(this->options.compaction_options_universal);
@ -2164,38 +2164,21 @@ ircd::db::database::column::column(database &d,
this->options.periodic_compaction_seconds = this->descriptor->compaction_period.count();
#endif
// Compression type
// Compression
this->options.compression = find_supported_compression(this->descriptor->compression);
//this->options.compression = rocksdb::kNoCompression;
// Specify compression type per level
this->options.compression_per_level =
{
// 0: uncompressed unsorted
rocksdb::kNoCompression,
// 1: uncompressed sorted
rocksdb::kNoCompression,
// 2, 3, 4: compressed sorted
this->options.compression,
this->options.compression,
this->options.compression,
this->options.compression,
// 6: highly compressed sorted
this->options.compression == rocksdb::kLZ4Compression?
rocksdb::kLZ4HCCompression:
this->options.compression,
};
// Compression options
this->options.compression_opts.enabled = true;
this->options.compression_opts.max_dict_bytes = 0;//8_MiB;
this->options.compression_opts.max_dict_bytes = 0; // ??
if(this->options.compression == rocksdb::kZSTD)
this->options.compression_opts.level = -3;
// Bottommost compression
this->options.bottommost_compression = this->options.compression_per_level.back();
this->options.bottommost_compression = this->options.compression;
this->options.bottommost_compression_opts = this->options.compression_opts;
if(this->options.bottommost_compression == rocksdb::kZSTD)
this->options.bottommost_compression_opts.level = 0;
//
// Table options
@ -2208,26 +2191,13 @@ ircd::db::database::column::column(database &d,
table_opts.format_version = 4; // RocksDB >= 5.16.x compat only; otherwise use 3.
table_opts.index_type = rocksdb::BlockBasedTableOptions::kTwoLevelIndexSearch;
table_opts.index_block_restart_interval = 1;
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 = true;
table_opts.pin_top_level_index_and_filter = false;
table_opts.pin_l0_filter_and_index_blocks_in_cache = false;
table_opts.partition_filters = true;
// Delta encoding is always used (option ignored) for table
// format_version >= 4 unless block_align=true.
table_opts.use_delta_encoding = false;
// 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;
table_opts.block_restart_interval = 8;
table_opts.index_block_restart_interval = 1; // >1 slows down iterations
// Determine whether the index for this column should be compressed.
const bool is_string_index(this->descriptor->type.first == typeid(string_view));
@ -2238,11 +2208,26 @@ ircd::db::database::column::column(database &d,
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_restart_interval = 16;
// 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 ||
this->options.compression == rocksdb::kDisableCompressionOption;
//table_opts.data_block_index_type = rocksdb::BlockBasedTableOptions::kDataBlockBinaryAndHash;
//table_opts.data_block_hash_table_util_ratio = 0.75;
// 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 = true;
table_opts.pin_top_level_index_and_filter = false;
table_opts.pin_l0_filter_and_index_blocks_in_cache = false;
table_opts.partition_filters = true;
// Setup the cache for assets.
const auto &cache_size(this->descriptor->cache_size);
if(cache_size != 0)