Memory usage

Badger’s memory usage can be managed by tweaking several options available in the Options struct that is passed in when opening the database using DB.Open.

• Options.ValueLogLoadingMode can be set to options.FileIO (instead of the default options.MemoryMap) to avoid memory-mapping log files. This can be useful in environments with low RAM.
• Number of memtables (Options.NumMemtables)
  • If you modify Options.NumMemtables, also adjust Options.NumLevelZeroTables and Options.NumLevelZeroTablesStall accordingly.
• Number of concurrent compactions (Options.NumCompactors)
• Mode in which LSM tree is loaded (Options.TableLoadingMode)
• Size of table (Options.MaxTableSize)
• Size of value log file (Options.ValueLogFileSize)

If you want to decrease the memory usage of Badger instance, tweak these options (ideally one at a time) until you achieve the desired memory usage.