On: Show HN: SuperString – A fast and memory-optimized string library for C++

[tspiteri]

How is the std string version taking over 450 MB for two copies (original and split into lines) of a 210 kB file?

[a_t48 → tspiteri]

Probably because his benchmark is broken. It always copies to the end of the file.

https://github.com/btwael/SuperString/blob/master/test/withS... this line should be ` lines.push_back(string.substr(last, i - last));` (it also drops the very last line, but who's counting, eh?).

If the 210kb file has a line every 80 bytes or so and is copied this way, it works out to around 490MB of data (caveat: my math may be wrong).

[tspiteri → a_t48]

In that case it's closer to 50 bytes I think. (Average wrong line length is 105k, as first line is 210k and last line is 0k, so number of lines is 450M / 105k (about 4300), so lines would be 210 / 4.3 = about 50 bytes.)