tweak rocksdb, use direct io

Signed-off-by: girlbossceo <june@girlboss.ceo>

src/database/abstraction/rocksdb.rs

@@ -26,7 +26,7 @@ fn db_options(max_open_files: i32, rocksdb_cache: &rocksdb::Cache) -> rocksdb::O
 
     // "Difference of spinning disk"
     // https://zhangyuchi.gitbooks.io/rocksdbbook/content/RocksDB-Tuning-Guide.html
-    block_based_options.set_block_size(4 * 1024);
+    block_based_options.set_block_size(64 * 1024);
     block_based_options.set_cache_index_and_filter_blocks(true);
 
     let mut db_opts = rocksdb::Options::default();
@@ -35,9 +35,12 @@ fn db_options(max_open_files: i32, rocksdb_cache: &rocksdb::Cache) -> rocksdb::O
     db_opts.set_skip_stats_update_on_db_open(true);
     db_opts.set_level_compaction_dynamic_level_bytes(true);
     db_opts.set_target_file_size_base(256 * 1024 * 1024);
+    // defaults to 1MB
+    //db_opts.set_writable_file_max_buffer_size(1024 * 1024);
+    // defaults to 2MB now
     //db_opts.set_compaction_readahead_size(2 * 1024 * 1024);
-    //db_opts.set_use_direct_reads(true);
-    //db_opts.set_use_direct_io_for_flush_and_compaction(true);
+    db_opts.set_use_direct_reads(true);
+    db_opts.set_use_direct_io_for_flush_and_compaction(true);
     db_opts.create_if_missing(true);
     db_opts.increase_parallelism(num_cpus::get() as i32);
     db_opts.set_max_open_files(max_open_files);