[petsc-users] matload big matrix

[Barry Smith]

On Jun 2, 2012, at 12:31 PM, Wen Jiang wrote:

> Thanks for your reply. 
> 
> How long is it taking? What file system are you reading the matrix from?
> 
>     It seems to never finish. Sorry, I do not know what does the file system mean.
> 
> What version of PETSc is this? How was the file generated?  How many processes are you using? Does it work on less processes (like 1, 2 )?  How many nonzeros in the matrix (roughly)?
> 
>     I am using 64 processes. The nonzeros in the matrix is around 8 billion. 
> 
>     I am using PETSc dev. But the binary file was generated by PETSc 3.2     PetscViewerBinaryOpen(PETSC_COMM_WORLD,"l2projphim.dat",FILE_MODE_WRITE,&viewer). I just tried to use PETSc 3.2 to read and it had no problem. For a smaller matrix, PETSc dev successfully read the binary file generated by PETSc 3.2. But I do not know why it does not work for large matrix. 
> 

   Are both PETSc's configured with --with-64-bit-indices? 

   Can you read it with fewer processes? Like 32 or 16?

   barry

> Thanks,
> 
> Regards,
> Wen
> 
>     
> 
> 
>