This is odd indeed. Are you on Cayenne 3.0?
I am not aware of this issue. All operations involved are constant
time ops regardless of the number of objects previously cached (such
as entry lookup in a HashMap or a list.add(..) operation).
So I may try to run this code in profiler to see why it is slowing
down. If you have access to a profiler and willing to profile it
yourself, this will help a lot of course :-)
Andrus
On Jul 14, 2010, at 2:21 PM, cosmin.maria..odium-it.com wrote:
>
> Sorry,
>
> The attached file was not uploaded.
> Here it is:
>
> package insert;
>
> import org.apache.cayenne.access.DataContext;
> import org.apache.cayenne.query.SelectQuery;
> import org.apache.commons.lang.time.DurationFormatUtils;
> import org.apache.commons.lang.time.StopWatch;
>
> public class Main {
>
> public static void main(String[] args) {
> DataContext dc = DataContext.createDataContext();
>
> final int stepSize = 500;
> final int nbSteps = 50;
>
> SelectQuery sq = new SelectQuery(ResultStream.class);
>
> ResultStream rs = (ResultStream) dc.performQuery(sq).get(0);
>
> StopWatch sw = new StopWatch();
> sw.start();
>
> for (int i = 1; i <= nbSteps * stepSize; ++i) {
> Result t = new Result();
> t.setValue(i);
> t.setResultStream(rs);
>
> dc.commitChanges();
>
> if (i % stepSize == 0) {
> sw.stop();
> System.out.printf("%6d, %s, %5d\n", i,
> DurationFormatUtils.formatDurationHMS(sw.getTime()),
> sw.getTime());
> sw.reset();
> sw.start();
> }
> }
> }
> }
>
>
>> Hello,
>>
>> While developing an application using Cayenne I noticed that the
>> performance of DataContext.commitChanges() degrades with the
>> number of
>> commits done.
>>
>> To be more specific, I have a model with two entities: Result and
>> ResultStream, with a many to one relation from Result to
>> ResultStream.
>>
>> The test I do is simple: I generate a lot of Result objects, all
>> linked to
>> the same ResultStream and I call commit after each Result added to
>> the
>> DataContext and measure the time it takes to perform the commit. I
>> notice
>> that this time grows fairly linear. Of course, the growth is
>> noticeably
>> after generating many results.
>>
>> Attached is the test source.
>>
>> If I don't make the link between result and resultStream, the
>> performance
>> is not degrading
>>
>> Could you please help me with some advice?
>> Is this a known issue, can it be fixed by tweaking cayenne?
>>
>> Many thanks,
>> Cosmin
>
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