[petsc-users] question on matrix preallocation

[Michael Povolotskyi]

Thank you,

let me clarify my question.

Imagine that I have a sparse matrix, and the number of non zero entries 
that I specified is too small.

I know that I can insert values in it but it will be slow.

I remember there was a way to make PETSC to throw an error if a number 
of non zero elements per row was bigger that was preallocated. Then I 
could fix my algorithm. Is this functionality available with the current 
version?

Michael.

On 7/11/2024 3:55 PM, Barry Smith wrote:
>
>   MatGetInfo() is the programmatic interface used to get this 
> information.  You can also run a proggram with -info and grep for malloc.
>
>   Barry
>
>
>> On Jul 11, 2024, at 1:55 PM, Michael Povolotskyi <mpovolot at gmail.com> 
>> wrote:
>>
>> This Message Is From an External Sender
>> This message came from outside your organization.
>> Hello,
>>
>> is there an option in PETSC that allows to check at run time if a sparse
>> matrix has been preallocated correctly? I remember there was something
>> like that is the older versions, but cannot find it now.
>>
>> The goal is to get rid of any possible time overhead due to dynamic
>> preallocation.
>>
>> Thank you,
>>
>> Michael.
>>
>>
>
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