Why does a JRuby application on App Engine take so long to start?

Posted by Major Tom on Stack Overflow See other posts from Stack Overflow or by Major Tom
Published on 2010-03-30T18:11:20Z Indexed on 2010/03/30 18:13 UTC
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Filed under:

google-app-engine

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jruby

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java

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ruby

I'm considering using JRuby on App Engine but have heard that Juby app on App Engine have a long startup lag. Why is this?

Is it because the JRuby jar files are so large that a cold startup requires them to be loaded into memory before the app can start serving?

That would be my guess but I'm not sure if that's a precise technical explanation.

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