How Do I Calculate the Memory Footprint of a Go Map?
Computing the Memory Footprint of a Map in Go
Calculating the memory consumption of a map in Go can be challenging due to its dynamic data structure. However, there are methods to estimate the memory footprint using the underlying implementation details.
Map Structure
Internally, a Go map is represented as a header (hmap) and a series of buckets (bmap). The header stores information such as the number of elements, bucket count, and hash seed. Each bucket contains the hash value, key, and value for a specific element.
Calculating Memory Footprint
To estimate the memory footprint of a map, the following formula can be used:
unsafe.Sizeof(hmap) + (len(theMap) * 8) + (len(theMap) * 8 * unsafe.Sizeof(x)) + (len(theMap) * 8 * unsafe.Sizeof(y))
- unsafe.Sizeof(hmap): Size of the map header
- len(theMap) * 8: Size of the keys and values (assuming both are 64-bit)
- len(theMap) * 8 * unsafe.Sizeof(x): Size of the keys
- len(theMap) * 8 * unsafe.Sizeof(y): Size of the values
Example Calculation
For a map with 100 elements, a key type of string, and a value type of int, the estimated memory footprint would be:
unsafe.Sizeof(hmap) + (100 * 8) + (100 * 8 * unsafe.Sizeof(string)) + (100 * 8 * unsafe.Sizeof(int))
Note:
The calculation assumes that the map is not dense (i.e., there are no empty buckets). This assumption should hold true for most practical scenarios.
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