Major Description
Currently, in DefaultTuple, we estimate the memory footprint for string as if it is char array. The formula we use is: length * 2 + 12. It turns out we underestimate the memory usage for string. Here is a list of real memory footprint for string we get from memory dump:
| length of string | memory in bytes |
| 7 | 56 |
| 3 | 48 |
| 1 | 40 |
I did a search and find the following formula can accurately estimate the memory footprint for string:
8 * (int) (((length * 2) + 45) / 8)