FW: Questions about data in Fields

[William Nystrom]

Second try to send this email.


----- Original Message ----- 

From: William 
Nystrom  

To: pooma-dev at codesourcery.com 
Cc: jcm at lanl.gov ; jxyh at lanl.gov ; sunsetmesa 

Sent: 7/24/2001 1:20:29 PM 

Subject: Questions about data in 
Fields








Hi Guys,

 

I talked to Jim about interfacing to some fortran linear solver code awhile 
back and then before I left for

vacation, John and I did some work to try and write the interface for our 
application using Pooma 2 so

we could use this fortran linear solver package.  One of the things I 
am trying to do is to query a Pooma 2

Field and find out the size of the data that is local to a processor.  
I've done this query for the domain object

for a Field and for a cell centered field, it reports sizes in each 
dimension or coordinate that are one more

than they should be.  John told me that you guys had decided to 
allocate enough space for a vertex centered

field even if the field was cell centered - as an optimization of some 
sort.  I am worried that the data for a

cell centered field may not be contiguous because of the extra padding that 
occurs for cell centered fields

and because the domain object thinks it's size in each dimension is one 
larger.  Can you tell me if the data

for a cell centered field that is local to a processor with one patch per 
processor is actually contiguous in

memory?  I can test this experimentally but I have not had a chance to 
do this yet.  Also, can you tell me the

recommended way to get the correct size of my data on a local processor for 
a cell centered Pooma 2

Field?

 

Please send replies to sunsetmesa at earthlink.net  as I am not 
able right now to read my lanl email and I

am not subscribing to pooma-dev from my ISP account.

 

Thanks,

 


--- William Nystrom

--- sunsetmesa at earthlink.net 

--- EarthLink: It's your Internet.

 




 

--- William Nystrom

--- sunsetmesa at earthlink.net 

--- EarthLink: It's your Internet.
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