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Gmane
From: Adam Lally (Commented) (JIRA) <dev-HHKbSdsD6WQPKjDvHGQMeg <at> public.gmane.org>
Subject: [jira] [Commented] (UIMA-2385) Improve XmiCasDeserializer performance by using low-level CAS APIs to create arrays
Newsgroups: gmane.comp.apache.uima.devel
Date: Monday 9th April 2012 22:01:20 UTC (over 4 years ago)
[ https://issues.apache.org/jira/browse/UIMA-2385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13250219#comment-13250219
] 

Adam Lally commented on UIMA-2385:
----------------------------------

Well, I may have gotten some bad data from the profiler (yourkit), since
deserialization time appears to be the same after my "fix". :(
                
> Improve XmiCasDeserializer performance by using low-level CAS APIs to
create arrays
>
-----------------------------------------------------------------------------------
>
>                 Key: UIMA-2385
>                 URL: https://issues.apache.org/jira/browse/UIMA-2385
>             Project: UIMA
>          Issue Type: Improvement
>          Components: Core Java Framework
>    Affects Versions: 2.4.0SDK
>            Reporter: Adam Lally
>            Assignee: Adam Lally
>
> I profiled an expensive CAS deserialization and found that 46% of the
time was in CASImpl.ll_getFSForRef (the method that creates a
FeatureStructure Java object for a CAS FS).  All those calls were coming
from deserializing arrays (of which this particular CAS has many).
> It is unnecessary to create FeatureStructure Java objects here.  For
non-array FSs, XmiCasDeserializer uses low-level CAS APIs in order to avoid
this overhead.  But for arrays, it currently does not use the low-level
APIs.

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