String#<< is awfully slow on shared strings, time grows very quickly
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Key: JRUBY-2841
URL: http://jira.codehaus.org/browse/JRUBY-2841
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.1.3
Environment: JRuby trunk (2008-07-20), OpenJDK 1.6.0-b09 server,
running on Ubuntu 8.04 32-bit
Reporter: Daniel Luz
time ruby -e 's = "hello"; 40_000.times{ s << s[0, 5] }'
real 0m0.089s
user 0m0.076s
sys 0m0.008s
time jruby -e 's = "hello"; 40_000.times{ s << s[0, 5] }'
real 0m11.788s
user 0m11.561s
sys 0m0.196s
MRI's time seems to grow slightly below linear; JRuby's time, on the other
hand, increases pretty quickly.
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