gomp slowness

[Tim Prince]

skaller wrote:
> On Thu, 2007-10-18 at 12:02 +0800, Biplab Kumar Modak wrote:
>   
>> skaller wrote:
>>     
>>> On Wed, 2007-10-17 at 18:14 +0100, Biagio Lucini wrote:
>>>       
>>>> skaller wrote:
>>>>         
>>>> It would be interesting to try with another compiler. Do you have access 
>>>> to another OpenMP-enabled compiler?
>>>>         
>>> Unfortunately no, unless MSVC++ in VS2005 has openMP.
>>> I have an Intel licence but they're too tied up with commerical
>>> vendors and it doesn't work on Ubuntu (it's built for Fedora and Suse).
>>>
>>>       
>> If possible, you can post the source code. I've a MSVC 2005 license (I 
>> bought it to get OpenMP working with it).
>>
>> I can then give it a try. I have a dual core PC. :)
>>     
>
> OK, attached.
>
>   
I don't know of any OpenMP compiler which would correct the nesting of 
parallel loops in your LU.  I have assumed that OpenMP doesn't allow 
such optimization; you have to get it right yourself.