13 521
правка
Изменения
Нет описания правки
* disabled messenger checksums (ms_crc_data=false) and bluestore checksums (bluestore_csum_type=none)
* tuned rocksdb: <tt>bluestore_rocksdb_options = compression=kNoCompression,max_write_buffer_number=64,min_write_buffer_number_to_merge=32,recycle_log_file_num=64,compaction_style=kCompactionStyleLevel,<br />write_buffer_size=4MB,target_file_size_base=4MB,max_background_compactions=64,level0_file_num_compaction_trigger=64,level0_slowdown_writes_trigger=128,<br />level0_stop_writes_trigger=256,max_bytes_for_level_base=6GB,compaction_threads=32,flusher_threads=8,compaction_readahead_size=2MB</tt> - this divides into:
** The main part is probably 64x32x4 MB memtables (number x merge x size) instead of default 4x1x256 MB. The effect of this change isn’t really clear for me. It may slightly reduce CPU load because sorting a big memtable is slower than sorting a small one. However, 32x4 compactions aren’t probably that much faster than 1x256.
** max_bytes_for_level_base is changed dramatically — it’s raised to 6 GB from 256 MB!
** added compaction threads
