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From "Billie Rinaldi (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-453) Profile and optimize server activity visualization
Date Mon, 12 Mar 2012 19:24:37 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13227801#comment-13227801
] 

Billie Rinaldi commented on ACCUMULO-453:
-----------------------------------------

I've begun work to switch this over to JSON.  The JSON loading does appear to be faster (perhaps
2x-5x faster than the XML), but the animation speed is still highly variable.  I started recording
the time between calls to the redraw function (drawDots), and with Firefox 10.0.2 it varies
between 0 and hundreds of milliseconds.  With Chrome it varies less, is usually around 16-18,
but is still occasionally in the 30s and very occasionally in the hundreds.  I'm not sure
how to proceed.  I may try using the traditional setInterval method instead of requestAnimFrame,
but I've read that requestAnimFrame is supposed to be better.

Also, there is some issue that is causing the server information box that displays when you
mouseover dots to flash in and out of existence for some mouse positions.
                
> Profile and optimize server activity visualization
> --------------------------------------------------
>
>                 Key: ACCUMULO-453
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-453
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: monitor
>            Reporter: Billie Rinaldi
>            Assignee: Billie Rinaldi
>              Labels: json, visualization
>
> The script reads the monitor xml periodically.  I created a fake xml page with a lot
of servers to see how it would work, and it slowed down considerably.  At the very least,
it should read the xml less often (perhaps every 5 seconds) and I'd like to lower the memory
usage as well.  JSON may be a better alternative.

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