[mpich-discuss] Query regarding structure of dynamic array derived datatype

[Raghu Reddy]

As far as I know, since your struct contains a pointer, I don't believe you
have a choice other than to pack.  

 

Someone can correct me if I'm wrong.

 

Thanks,

 

Raghu

 

 

 

From: discuss-bounces at mpich.org [mailto:discuss-bounces at mpich.org] On Behalf
Of Mahesh Doijade
Sent: Thursday, March 21, 2013 4:42 AM
To: mpich-discuss at mcs.anl.gov
Subject: Re: [mpich-discuss] Query regarding structure of dynamic array
derived datatype

 

Hi,
     Thanks for your reply, after looking at various MPI derived datatype
creation functions other than MPI_Pack according to me option can probably
be of using MPI_Type_create_struct but then for each structure element I
have to create a separate derived datatype as the block lengths will be
different due to dynamic array present in them, so again the extra memory
will be required now for type-maps of these datatypes.
      Is the approach of MPI_Type_create_struct mentioned above will be
better than MPI_Pack in this case?  also is there any other optimal way to
do this?


-- 

Regards,
-- Mahesh Doijade

On Thu, Mar 21, 2013 at 2:36 AM, Pavan Balaji <balaji at mcs.anl.gov> wrote:


Please look through the derived datatype constructs in MPI.  Google can
help you find some tutorials.

 -- Pavan


On 03/19/2013 06:12 AM US Central Time, Mahesh Doijade wrote:
> Hi,
>      I have a struct as -
> struct A
> {
>     int size;
>     int *lptr;
> };
>      And then I have array of such structure, I want to only send
> dynamic array present in each of the structs to other process.
> One of the options is to do it with MPI_Pack but then I have read it is
> not so good from performance point of view.
> What can be the other opt
>
> --
>
> Regards,
> -- Mahesh Doijade
>
>
>
>
>

> _______________________________________________
> discuss mailing list     discuss at mpich.org
> To manage subscription options or unsubscribe:
> https://lists.mpich.org/mailman/listinfo/discuss
>

--
Pavan Balaji
http://www.mcs.anl.gov/~balaji <http://www.mcs.anl.gov/%7Ebalaji> 



                                                                           

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mpich.org/pipermail/discuss/attachments/20130321/4df00cf5/attachment.html>