[petsc-users] Questions about PETSc

[Zuhair Khayyat]

Dear Aron,

Actually the file is an output of another application, and is stored in a
simple text file. I have read about MPIIO, however couldn't figure out if it
is a parallel file reader or not.

Have you ever tried or worked on a parallel file reader to a common global
matrix in PETSc, where each processor has part of the file? Thank you

Regards,
Zuhair Khayyat

On Sat, Jan 8, 2011 at 8:42 PM, Aron Ahmadia <aron.ahmadia at kaust.edu.sa>wrote:

> if the file is stored in the PETSc format, you can use PETSc to pull the
> file in using MPIIO, which should be (hopefully) faster.
>
>
> http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/Viewer/PetscViewerBinarySetMPIIO.html
>
> Feel free to pop these questions to petsc-users (cc'd), there are more of
> them and they usually know more than me :)
>
> -Aron
>
>
> On Sat, Jan 8, 2011 at 2:21 PM, Zuhair Khayyat <
> zuhair.khayyat at kaust.edu.sa> wrote:
>
>> Dear Aron,
>>
>> Currently I am using PETSc for my research to implement a graph mining
>> algorithm on a large cluster, and I would like ask you some questions due to
>> your experience with this tool.
>>
>> Have you ever tried to optimize allocating a very large matrix from input
>> file in parallel? I have a very large file (around 10 GB) and it takes too
>> long to allocate the matrix through the main node. I am planning to
>> implement a distributed parallel file reader that split the original file
>> and make each node reads it separately into a common matrix.
>>
>> Is there and other tools that are comparable to PETSc in which they have
>> parallel file reader?
>>
>> Thank you for your help
>>
>> Regards,
>> Zuhair Khayyat
>>
>
>
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