tuple_object.info()

object tuple_object¶

tuple_object:info()¶

Get information about the tuple memory usage.

Returns a table with the following fields:

data_size – size of MessagePack data in the tuple. This number equals to number returned by box.tuple.bsize().
header_size - size of the internal tuple header.
field_map_size – size of the field map. Field map is used to speed up access to indexed fields of the tuple.
waste_size – amount of excess memory wasted due to internal fragmentation in the slab allocator.

Note

waste_size is provided for reference only and can be inaccurate. Avoid using it for memory usage calculations.
arena - type of the arena where the tuple is allocated. Possible values are: memtx, malloc, runtime.

Return:	tuple memory usage statistics
Rtype:	table

Example

tarantool> box.space.tester:get('222200000'):info()
---
- data_size: 55
  waste_size: 95
  arena: memtx
  field_map_size: 4
  header_size: 6
...