[jira] Created: (RVM-852) r15772 causes timeouts in jni gc stress tests

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[jira] Created: (RVM-852) r15772 causes timeouts in jni gc stress tests

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r15772 causes timeouts in jni gc stress tests
---------------------------------------------

                 Key: RVM-852
                 URL: http://jira.codehaus.org/browse/RVM-852
             Project: RVM
          Issue Type: Bug
            Reporter: David Grove
             Fix For: svn head


Spot checking a couple of the jni tests, the jni sub-tests went from finishing in a few seconds to timing out in 1000 seconds.

http://jikesrvm.anu.edu.au/cattrack/results/jalapeno.anu.edu.au/stress/10845/regression_report



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[jira] Assigned: (RVM-852) r15772 causes timeouts in jni gc stress tests

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     [ http://jira.codehaus.org/browse/RVM-852?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Blackburn reassigned RVM-852:
-----------------------------------

    Assignee: Steve Blackburn

> r15772 causes timeouts in jni gc stress tests
> ---------------------------------------------
>
>                 Key: RVM-852
>                 URL: http://jira.codehaus.org/browse/RVM-852
>             Project: RVM
>          Issue Type: Bug
>            Reporter: David Grove
>            Assignee: Steve Blackburn
>             Fix For: svn head
>
>
> Spot checking a couple of the jni tests, the jni sub-tests went from finishing in a few seconds to timing out in 1000 seconds.
> http://jikesrvm.anu.edu.au/cattrack/results/jalapeno.anu.edu.au/stress/10845/regression_report

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[jira] Commented: (RVM-852) r15772 causes timeouts in jni gc stress tests

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    [ http://jira.codehaus.org/browse/RVM-852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=192046#action_192046 ]

Steve Blackburn commented on RVM-852:
-------------------------------------

At this stage I believe that this bug is actually unrelated to r15772, and that that commit only exposed that underlying bug via some second or third order effect.

Here's how I come to that conclusion:

1.  r15772 is supposed to be a semantic no-op; it is supposed to just be refactoring.

2. In fact r15772 did include one unintended change, which I backed out in r15781---but undoing this had no affect on the regressions relating to RVM-582.

3. When Daniel tried to reproduce the bug he could not do so:
   3.1 He could not do it on another machine
   3.2 He could not do it on the same machine
   3.3 He could not do it on the same machine by running the exact same tests with the same build binary that was failing at the moment he was testing.

4.  Laurence also tried to find the bug and had no luck (but noted some other problem along the way; RVM-857).

5. The bug is intermittent on the regression machine (even when the head is unchanged)

6.  When I committed r15785-r15787, the bug went away entirely.  These commits are also semantic no-ops but 15787 introduces a fair amount of new (currently unused) code into our API.

If anyone else has thoughts on this, by all means say so, but for the moment I'm going to declare that the bug still exists and that it is elusive---no one has manually reproduced it under any circumstance, as far as I know; just our automated regressions(!)---and then with no-op changes to the code base it "vanished".

Sigh.

> r15772 causes timeouts in jni gc stress tests
> ---------------------------------------------
>
>                 Key: RVM-852
>                 URL: http://jira.codehaus.org/browse/RVM-852
>             Project: RVM
>          Issue Type: Bug
>            Reporter: David Grove
>            Assignee: Steve Blackburn
>             Fix For: svn head
>
>
> Spot checking a couple of the jni tests, the jni sub-tests went from finishing in a few seconds to timing out in 1000 seconds.
> http://jikesrvm.anu.edu.au/cattrack/results/jalapeno.anu.edu.au/stress/10845/regression_report

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[jira] Commented: (RVM-852) r15772 causes timeouts in jni gc stress tests

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    [ http://jira.codehaus.org/browse/RVM-852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=192629#action_192629 ]

David Grove commented on RVM-852:
---------------------------------

At this point I think I'm going to go ahead and close this as unreproducible unless anyone objects.  



> r15772 causes timeouts in jni gc stress tests
> ---------------------------------------------
>
>                 Key: RVM-852
>                 URL: http://jira.codehaus.org/browse/RVM-852
>             Project: RVM
>          Issue Type: Bug
>            Reporter: David Grove
>            Assignee: Steve Blackburn
>             Fix For: svn head
>
>
> Spot checking a couple of the jni tests, the jni sub-tests went from finishing in a few seconds to timing out in 1000 seconds.
> http://jikesrvm.anu.edu.au/cattrack/results/jalapeno.anu.edu.au/stress/10845/regression_report

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[jira] Closed: (RVM-852) r15772 causes timeouts in jni gc stress tests

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     [ http://jira.codehaus.org/browse/RVM-852?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Grove closed RVM-852.
---------------------------

       Resolution: Cannot Reproduce
    Fix Version/s:     (was: svn head)

> r15772 causes timeouts in jni gc stress tests
> ---------------------------------------------
>
>                 Key: RVM-852
>                 URL: http://jira.codehaus.org/browse/RVM-852
>             Project: RVM
>          Issue Type: Bug
>            Reporter: David Grove
>            Assignee: Steve Blackburn
>
> Spot checking a couple of the jni tests, the jni sub-tests went from finishing in a few seconds to timing out in 1000 seconds.
> http://jikesrvm.anu.edu.au/cattrack/results/jalapeno.anu.edu.au/stress/10845/regression_report

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