[petsc-users] A problem with MPI Derived Data Type and 'calloc'

[Jed Brown]

On Fri, Apr 13, 2012 at 17:38, Zhenglun (Alan) Wei
<zhenglun.wei at gmail.com>wrote:

>     I have a final question on it. Is it taken a lot of memory for doing
> this? As I understand, pointers won't occupy many memories and it works
> like an alias. It will not, to my limit knowledge, take much extra memory
> by doing this.


A pointer takes about as much space as a floating point value, so that
array of pointers costs about 1*N compared to the N*N matrix.
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