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Feature #15151

Updated by chopraanmol1 (Anmol Chopra) over 1 year ago

String#slice! when used at beginning of string (e.g. slice!(0,10)) calls rb_str_drop_bytes which creates shared string for non embedded embed string. str_modify_keep_cr clears the flag of shared string which is called before rb_str_drop_bytes. Due to which while calling slice! multiple time on same string creates multiple duplicate string.

Patch:

https://github.com/ruby/ruby/pull/1961

Comparison:
trunk:
~~~
Total allocated: 141116188 bytes (11250 objects)

0.048000 0.000000 0.048000 ( 0.045974)
~~~

patch:
~~~
Total allocated: 300080 bytes (7502 objects)

0.016000 0.004000 0.020000 ( 0.017376)
~~~

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