Issue #15151 has been updated by chopraanmol1 (Anmol Chopra).
@nobu can you look into this? Thank you.
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Bug #15151: String#slice!(0,..) creates a duplicate of original string
https://bugs.ruby-lang.org/issues/15151#change-74262
* Author: chopraanmol1 (Anmol Chopra)
* Status: Open
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.6.0dev (2018-09-23 trunk 64815) [x86_64-linux]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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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 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)
~~~
---Files--------------------------------
bench_slice_bang.rb (412 Bytes)
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