[mpich-discuss] Error while using MPI platform with CPP program

[Umesh Shisode]

Hello Junchao,

I initialize vector b, but even then it is not working for broadcasting. It
gives same error. As the vector class is user defined and also I use
dynamic memory allocation. This may be the reason for failing. If you know
about it then please tell.
I am here attaching the zip file which contains only the vector class and
main file as well as error I am facing. Please have a look at it. Thanks
for your time. I am waiting for your reply.


Regards,

Umesh Sharad Shisode,
M.Tech in Modeling and Simulation(2013-15),
Centre for Modeling and Simulation,
University of Pune.

On Tue, May 19, 2015 at 10:57 PM, Junchao Zhang <jczhang at mcs.anl.gov> wrote:

> Your code "MPI_Bcast(&b(0), b.get_row(), MPI_DOUBLE, 1, MPI_COMM_WORLD)"
>  is OK.  You can find manual of MPI_Bcast at
> http://mpi.deino.net/mpi_functions/MPI_Bcast.html
> Don't forget to initialize the vector b, in other words, allocate memory
> for it, on ALL ranks.
>
>
> --Junchao Zhang
>
> On Tue, May 19, 2015 at 9:27 AM, Umesh Shisode <ushisode1 at gmail.com>
> wrote:
>
>> Hi Junchao,
>>
>> I sort out the problem for MPI_Send() and MPI_Recv(), as I requested in
>> last mail. Now I have one more difficulty which is how can I broadcast
>> class object using MPI_Bcast() function. In my case, class is Vector (you
>> can check it at vect_fun.h header file). I want to broadcast it to all
>> processes. I have used dynamic memory allocation in the code. Please help
>> me to solved the issue. I am waiting for your reply. Thanks.
>>
>>
>> Regards,
>>
>> Umesh Sharad Shisode,
>> M.Tech in Modeling and Simulation(2013-15),
>> Centre for Modeling and Simulation,
>> University of Pune.
>>
>> On Tue, May 19, 2015 at 7:51 AM, Umesh Shisode <ushisode1 at gmail.com>
>> wrote:
>>
>>> Sorry Junchao,
>>>
>>> Thanks for your reply. But my problem is with MPICH only. My question is
>>> how to send part of class object (in my case matrix object) from one
>>> process to another process using MPI_Send and receive using MPI_Recv
>>> functions. I tried a lot of way but couldn't do it. I hope you will help
>>> me. Thanks in advance. I have write a function to get the pointer address
>>> for first parameter of MPI_Send() function. Waiting for your reply.
>>>
>>> Regards,
>>>
>>> Umesh Sharad Shisode,
>>> M.Tech in Modeling and Simulation(2013-15),
>>> Centre for Modeling and Simulation,
>>> University of Pune.
>>>
>>> On Mon, May 18, 2015 at 7:31 PM, Junchao Zhang <jczhang at mcs.anl.gov>
>>> wrote:
>>>
>>>> Could not reproduce it with the latest MPICH.  If the problem is not
>>>> specific to MPICH, you'd better move your question to other forums like
>>>> stackoverflow.
>>>>
>>>> $mpirun -n 2 ./test
>>>> Matrix A :
>>>>
>>>> 1 2 3 4
>>>> 1 2 3 4
>>>> 1 2 3 4
>>>> 1 2 3 4
>>>>
>>>> Vector b before broadcast:
>>>>  1.000000,  2.000000,  3.000000,  4.000000
>>>> Matrix A column : 4
>>>> after sending:  lLim = 2 uLim = 4  for rank : 1
>>>> count = 8
>>>>
>>>> Matrix A column : 0for rank = 1
>>>> after receive:  lLim = 2 uLim = 4  for rank : 1
>>>> Ncol after broadcasting = 4
>>>>
>>>>
>>>> --Junchao Zhang
>>>>
>>>> On Mon, May 18, 2015 at 6:33 AM, Umesh Shisode <ushisode1 at gmail.com>
>>>> wrote:
>>>>
>>>>> Hello Sir / Madam,
>>>>>
>>>>> This is Umesh Sharad Shisode, pursuing Masters in Modeling and
>>>>> Simulation, at Centre for Modeling and Simulation, Pune University. I am in
>>>>> the final stage of my course. My Masters Thesis title is :
>>>>>
>>>>>     Development of Conjugate Gradient solver in OpenFOAM / CPP using
>>>>> MPI
>>>>>
>>>>> I am now doing MPI part of my project and facing some problems with
>>>>> MPI functions syntax. I am trying to use CPP class object with MPI
>>>>> functions but it is giving some error. Which I don't understand.
>>>>>
>>>>> Operating system         : LINUX
>>>>> Programming Language : CPP
>>>>>
>>>>> Commands I am using are :
>>>>>
>>>>>        > mpic++ main.cpp -o result
>>>>>        > mpirun -np 2 result
>>>>>
>>>>> Please help me to sort out this issue . I am attaching herewith zip
>>>>> file containing the code which I want to parallelize with the png file
>>>>> containing error. Waiting for your reply. Thanks in advance.
>>>>>
>>>>> Regards,
>>>>>
>>>>> Umesh Sharad Shisode,
>>>>> M.Tech in Modeling and Simulation(2013-15),
>>>>> Centre for Modeling and Simulation,
>>>>> University of Pune.
>>>>>
>>>>>
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>>>>
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>>
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