[
https://issues.apache.org/jira/browse/UIMA-6136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16958136#comment-16958136
]
Richard Eckart de Castilho commented on UIMA-6136:
--------------------------------------------------
Here you go:
*import* java.util.ArrayList;
*import* java.util.List;
*import* org.apache.uima.cas.CAS;
*import* org.apache.uima.fit.factory.JCasFactory;
*import* org.apache.uima.jcas.JCas;
*import* org.apache.uima.resource.metadata.TypeDescription;
*import* org.apache.uima.resource.metadata.TypeSystemDescription;
*import* org.apache.uima.resource.metadata.impl.TypeSystemDescription_impl;
*public* *class* Uima6136Test
{
*public* *static* *void* main(String[] args) *throws* Exception
{
TypeSystemDescription tsd = *new* TypeSystemDescription_impl();
*for* (*int* i = 0; i < 500; i++) {
TypeDescription type = tsd.addType("Type_" + i, "",
CAS.*TYPE_NAME_ANNOTATION*);
*for* (*int* f = 0; f < 10; f++) {
type.addFeature("Feature_" + f, "", CAS.*TYPE_NAME_STRING*);
}
}
List<JCas> cas = *new* ArrayList<>();
*for* (*int* i = 0; i < 2000; i++) {
*long* start = System.currentTimeMillis();
cas.add(JCasFactory.createJCas(tsd));
*long* duration = System.currentTimeMillis() - start;
System.*out*.printf("%d - %d%n", i, duration);
}
}
}
> FSIndexComparatorImpl.equalsWithoutType() gets slow for many CASes with the
> same TS
> -----------------------------------------------------------------------------------
>
> Key: UIMA-6136
> URL: https://issues.apache.org/jira/browse/UIMA-6136
> Project: UIMA
> Issue Type: Bug
> Components: UIMA
> Affects Versions: 3.1.0SDK
> Reporter: Richard Eckart de Castilho
> Priority: Minor
> Attachments: 2019-10-21_22-23-37.png, 2019-10-21_22-44-25.png
>
>
> When creating several hundred CASes with the same type system, the
> `shareExisting` mechanism which is designed to save on memory starts eating
> into CPU time quite a lot.
> This screenshot shows that in my particular case, the method is called ~11mio
> times and takes the bulk of the processing time. The call hierarchy is a bit
> messed up though - actually this happens when the CASes are initialized.
> !2019-10-21_22-44-25.png|width=100%!
> The second screenshot shows the actual call hierarchy, but for some reason,
> the profile doesn't properly dive into the `equals` method here and doesn't
> count the time spent in `equalsWithoutType`.
> !2019-10-21_22-23-37.png|width=100%!!
> So either the method shouldn't be called that often - or - it should be way
> faster.
> In the example, I have like 1800 CAS instances and their type system has
> upwards of 200 types.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
