speed-up yaml/yecht loading
---------------------------
Key: JRUBY-4268
URL: http://jira.codehaus.org/browse/JRUBY-4268
Project: JRuby
Issue Type: New Feature
Components: Extensions, Performance
Affects Versions: JRuby 1.4
Reporter: Vladimir Sizikov
Now that other low hanging fruits for speeding-up the rubygems loading are
eliminated, the yaml/yecht startup is the most significant contributor to slow
rubygems loading.
Take a look, simple "require 'yaml'" takes about 300+ms. Entire rubygems
startup is 800+, so almost half of that time is spent in yaml.
If only we could eliminate, for example, loading of date (or lazy-load it
somehow), that would be a significant boost.
{noformat}
#>jruby -b -e "require 'yaml'"
-> builtin/core_ext/symbol
<- builtin/core_ext/symbol - 41ms
-> enumerator
<- enumerator - 5ms
-> yaml
-> stringio
<- stringio - 9ms
-> yaml/compat
<- yaml/compat - 11ms
-> yaml/error
<- yaml/error - 2ms
-> yaml/yecht
-> yecht
<- yecht - 78ms
-> yaml/basenode
-> yaml/ypath
<- yaml/ypath - 6ms
<- yaml/basenode - 29ms
<- yaml/yecht - 110ms
-> yaml/tag
<- yaml/tag - 6ms
-> yaml/stream
<- yaml/stream - 1ms
-> yaml/constants
<- yaml/constants - 2ms
-> yaml/rubytypes
-> date
-> rational
<- rational - 14ms
-> date/format
-> rational
<- rational - 1ms
<- date/format - 78ms
<- date - 177ms
-> yaml/compat
<- yaml/compat - 0ms
<- yaml/rubytypes - 217ms
-> yaml/types
-> yaml/compat
<- yaml/compat - 0ms
<- yaml/types - 14ms
<- yaml - 400ms
{noformat}
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