[Beowulf] Threaded code

Joe Landman landman at scalableinformatics.com
Tue Aug 17 13:05:13 EDT 2004


Art:

  Is it possible that the parallel section completes very quickly?  Or 
that code path is not taken?

Joe

Art Edwards wrote:

>I mean that when we run the threaded code and look at top, don't see two
>processors running. The load is always less than or equal to one. When
>we run two separate jobs, we see a load of 2. 
>
>Art Edwards
>
>On Tue, Aug 17, 2004 at 07:45:32AM -0700, Alvin Oga wrote:
>  
>
>>hi ya
>>
>>yup.. that is dual cpu
>>
>>On Tue, 17 Aug 2004, Art Edwards wrote:
>>
>>    
>>
>>>We are running SuSE 9.1 on a system with 8 GB of ram and two scsi disks.
>>>Here is /proc/cpuinfo
>>>processor       : 0
>>>      
>>>
>>good
>>
>>    
>>
>>>processor       : 1
>>>      
>>>
>>good
>>
>>    
>>
>>>Linux bladerunner 2.6.4-52-smp #1 SMP Wed Apr 7 01:58:54 UTC 2004 x86_64
>>>x86_64 x86_64 GNU/Linux
>>>      
>>>
>>good
>>
>>
>>    
>>
>>>>Newbie question:
>>>>
>>>>We just purchased a dual opteron box that is running an SMP kernel. We
>>>>have built a fortran code using g77 and a pthreaded atlas. Currently, we
>>>>see only one processor. What really simple thing have we missed?
>>>>        
>>>>
>>so what do you mean by "see only one processor" ??
>>
>>c ya
>>alvin
>>    
>>
>
>  
>


-- 
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics LLC,
email: landman at scalableinformatics.com
web  : http://www.scalableinformatics.com
phone: +1 734 612 4615

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