Re: Performance problem 1.2

From: Andrus Adamchik (andru..bjectstyle.org)
Date: Thu Feb 02 2006 - 12:46:48 EST

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    Hi Florian,

    We take a standard approach of avoiding early optimization. I was
    going to do profiling when 1.2 goes beta. Right now too many things
    change to do any meaningful work on that.

    But still thanks for bringing this up! I would even go as far as
    opening an issue in Jira to list your findings so that we do not
    overlook it. Could you please do that:

    http://objectstyle.org/cayenne/bugs-features.html

    > Profiling of the application show us that in version 1.2 most of the
    > creation time is spent inside
    > org.objectstyle.cayenne.util.IDUtil.pseudoUniqueByteSequence16()

    Need to look into that. Due to the new remoting and nesting features
    we need a temporary ID that is unique, but we may need a better
    algorithm. Maybe batch this operation somehow. Your application made
    the inefficiency obvious since you insert lots of objects.

    > The call
    > org.objectstyle.cayenne.access.DataContext.createAndRegisterNewObject(
    > Class)
    > is up to 6 time slower in the 1.2 implementation.
    >
    > Also it show us that for 40 commits the code 1.2 is 500 ms times
    > slower
    > than 1.1.

    Do you have relative data (500 ms. relative to what)? Also do you
    have any profiling data to point to the cause?

    Thanks
    Andrus

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