LAM: MPI_BARRIER problem

Hi, I'm studying about Parallel processing right now. And
I'm kinda new to this world.
When I test my cluster implementation using inverse matrix,
1 mill times 1 mill, the MPI_Barrier always error. Is there
a way to remove this error? I can assure you that the source
code I've been using dont have any error, since I used it to
test the same inverse matrix but only until about 6000 times
6000.

Thank you.
Sincerely,
Richard

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On May 7, 2008, at 1:38 AM, richard pan wrote:

> Hi, I'm studying about Parallel processing right now.
And I'm kinda  
> new to this world.
> When I test my cluster implementation using inverse
matrix, 1 mill  
> times 1 mill, the MPI_Barrier always error. Is there a
way to remove  
> this error? I can assure you that the source code I've
been using  
> dont have any error, since I used it to test the same
inverse matrix  
> but only until about 6000 times 6000.

It's kind of hard to help when you don't include the error
message  
that MPI_BARRIER caused.  That being said, generally errors
in barrier  
are caused by a previous problem, such as memory corruption
from  
overwriting an array.  You might want to use a memory
debugger such as  
valgrind to make sure you don't have any issues in your
code.  Just  
because something works at one matrix size does not mean
that its  
correct -- we've seen many times where one matrix size works
and  
another doesn't, simply because of what was placed directly
after the  
array, depending on the whims of the compiler / allocator.

Brian

-- 
   Brian Barrett
   LAM/MPI Developer
   Make today a LAM/MPI day!


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