fix: disable direct IO again

src/database/abstraction/rocksdb.rs

@@ -22,7 +22,7 @@ fn db_options(cache_capacity_bytes: usize, rocksdb_cache: &rocksdb::Cache) -> ro
 
     // "Difference of spinning disk"
     // https://zhangyuchi.gitbooks.io/rocksdbbook/content/RocksDB-Tuning-Guide.html
-    block_based_options.set_block_size(64 * 1024);
+    block_based_options.set_block_size(4 * 1024);
     block_based_options.set_cache_index_and_filter_blocks(true);
 
     let mut db_opts = rocksdb::Options::default();
@@ -31,9 +31,9 @@ fn db_options(cache_capacity_bytes: usize, rocksdb_cache: &rocksdb::Cache) -> ro
     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);
-    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_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.create_if_missing(true);
     db_opts.increase_parallelism(num_cpus::get() as i32);
     db_opts.set_max_open_files(512);