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From Roland Beuker <roland.beu...@xs4all.nl>
Subject Re: [jira] Commented: (DERBY-260) Derby is not stable on multiprocessor or Hyperthreating architectures.
Date Wed, 11 May 2005 08:20:46 GMT
Hello Sunitha,

I am arranging a Hyperthreating or Multiprocessor target to do some 
tests (the initial target was from one of our customers...). I also got 
a reaction from developerworks:

http://www-128.ibm.com/developerworks/forums/dw_thread.jsp?forum=370&thread=80481 
<http://www-128.ibm.com/developerworks/forums/dw_thread.jsp?forum=370&thread=80481>

Both your and their reaction is that Cloudscape/Derby should work on a 
multi-processor target. This could mean a problem with Hibernate instead 
of the Java database. At this moment I don't have any specific details 
next to the fact that databases get/set statements where not working 
right when Hyperthreating was enabled on the target platform. The 
problem disappeared when I switched of Hyperthreating in the bios from 
the target platform.

Regards,

Roland Beuker

Sunitha Kambhampati (JIRA) wrote:

>     [ http://issues.apache.org/jira/browse/DERBY-260?page=comments#action_64651 ]
>     
>Sunitha Kambhampati commented on DERBY-260:
>-------------------------------------------
>
>I have run some simple tests on a 1cpu (linux machine) with hyperthreading enabled and
once on a 2cpu (Intel Xeon) win2k machine with hyperthreading enabled and it worked fine.

>
>Can you provide more details on what issues you noticed. That would really help to resolve
this issue. 
>
>  
>
>>Derby is not stable on multiprocessor or Hyperthreating architectures.
>>----------------------------------------------------------------------
>>
>>         Key: DERBY-260
>>         URL: http://issues.apache.org/jira/browse/DERBY-260
>>     Project: Derby
>>        Type: Bug
>> Environment: P4 3GHz with Hyperthreating, 512 Mb, WIN2000 
>>    Reporter: Roland Beuker
>>    
>>
>
>  
>
>>Hello,
>>I am using IBM Cloudscape Version 10.0 with Hibernate and it works great. But at the
time I was deploying my project on a target with a Hyperthreating CPU things went wrong (database
very unstable). It seems that Cloudscape is not functioning on multiprocessor or Hyperthreating
architectures. Has anyone some more information?
>>Regards,
>>Roland Beuker 
>>    
>>
>
>  
>


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