Issue #5767 has been updated by Yura Sokolov.


https://gist.github.com/1688857

Most of success of that gist is cause of this issue.
Cites from comments:

Thanks for sharing that. Indeed the speed increase is quite impressive! I've tested the time it take to run some rspec test before and after. Here are the results:

Before: Finished in 402.79 seconds (3521 examples, 3 failures, 39 pending)
After: Finished in 222,82 seconds (3521 examples, 3 failures, 39 pending). WOOW!

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Obligatory benchmarks:

Test Suite on 1.9.3-p0 proper : 2m06s
Rails boot time : 9.1s

Suite on 1.9.3-p0-perf : 1m32s
Rails boot time : 6.5s

Not bad.

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$ time rake

before:
real 0m37.919s
user 0m6.474s
sys 0m0.919s

after:
real 0m34.236s
user 0m3.367s
sys 0m0.848s

$ time rails runner "Time.now"

before:
real 0m4.589s
user 0m3.871s
sys 0m0.629s

after:
real 0m2.437s
user 0m1.889s
sys 0m0.534s

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5.5 secs instead of 8.8 secs for rails runner "puts \"omfg\""
rspec . 15.1 seconds instead of 18.2 seconds

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One of my Rails apps, boot time (measured with ./bin/rails runner 'puts 3'

    1.9.3-perf:  5.1 seconds
    1.9.3-p0:    8.1 seconds
    1.9.2-p290: 18.2 seconds

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My rake parallel:spec went down from 68 to 38sec!!!!!!!!!! That's 44% cut off! Fantastic! THANK YOU!

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API spec tests ~30% faster!

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time bundle exec rake environment

Before:
14.60s user 1.26s system 100% cpu 15.861 total

After:
5.11s user 1.10s system 99% cpu 6.212 total

60.8% speedup!!!!!!

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Feature #5767: Cache expanded_load_path to reduce startup time
https://bugs.ruby-lang.org/issues/5767

Author: Yura Sokolov
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


This patch add caching of expanded load path.
It reduces rails startup time by 33%
(patch against 1.9.3-p0 and simple performance test is here https://gist.github.com/1480404 )


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