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From "Andrew Grieve (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CB-638) Slow native bridge (especially android)
Date Fri, 14 Sep 2012 20:29:09 GMT

    [ https://issues.apache.org/jira/browse/CB-638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13456117#comment-13456117
] 

Andrew Grieve commented on CB-638:
----------------------------------

That turned out to be it. I added a flag to disable the optimization and HANGING_GET got a
lot slower. 

I tried to get your benchmark to be more accurate by disabling setTimeout and adding in delays,
but it's still not quite giving the same results as the manual page I created.

I also played with using benchmark.js to measure the times, but it gives ops/second that are
far below what the manual test page shows. I suspect it's from it's use of setTimeout when
using deferred tests, but I found the source code of benchmark.js to be quite confusing, so
gave up on it.

In case you're interested, I pushed it to my github as a separate entry in the auto-tests
page. I'm not planning on committing it though, as I think the manual test page does a better
job at measuring.

https://github.com/agrieve/incubator-cordova-mobile-spec/tree/bench


                
> Slow native bridge (especially android)
> ---------------------------------------
>
>                 Key: CB-638
>                 URL: https://issues.apache.org/jira/browse/CB-638
>             Project: Apache Cordova
>          Issue Type: Improvement
>          Components: Android
>            Reporter: Lee Crossley
>            Assignee: Andrew Grieve
>            Priority: Critical
>              Labels: 2.1.0
>             Fix For: 2.2.0
>
>
> Doing many native callbacks (such as writing files) has a significant overhead.
> Trigger.io's native bridge is more than 5 times faster than Cordova (on Android). http://trigger.io/cross-platform-application-development-blog/wp-content/uploads/2012/02/chart_1-21.png
> I'd love to see similar performance stats in Cordova.

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