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Date: Thu, 26 Feb 2009 06:59:01 -0800 (PST)
From: "Richard S. Hall (JIRA)" <jira@apache.org>
To: dev@felix.apache.org
Subject: [jira] Commented: (FELIX-961) 100% CPU looping inside uses
 calculation
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    [ https://issues.apache.org/jira/browse/FELIX-961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12677012#action_12677012 ] 

Richard S. Hall commented on FELIX-961:
---------------------------------------

Looking at TESTCASE2, it does indeed lead to long delays, although it does appear to be making progress in all cases. Interestingly, some executions do finish quickly, which is dependent upon the ordering we get when we iterate over the entries in a hash map. In short, the algorithm is working as expected, which can be slow in some scenarios. I am looking into implementing some heuristics that may help us out, but worst case will always be bad unless we come up with a completely different algorithm. Hopefully, I can improve this case.

> 100% CPU looping inside uses calculation
> ----------------------------------------
>
>                 Key: FELIX-961
>                 URL: https://issues.apache.org/jira/browse/FELIX-961
>             Project: Felix
>          Issue Type: Bug
>          Components: Framework
>    Affects Versions: felix-1.4.1
>            Reporter: Stuart McCulloch
>         Attachments: USES_TESTCASE.zip, USES_TESTCASE2.zip
>
>
> While investigating a problem report against pax-runner (http://article.gmane.org/gmane.comp.java.ops4j.general/6778) I found it was actually caused by a 100% CPU loop inside the "uses" calculation code. In Felix 1.4.1 this was stopping the shell bundle from activating, hence the lack of console. Using the trunk build I can get a console, but the looping still occurs with the testcase.

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