[petsc-users] Optimized Option

[Satish Balay]

On Fri, 3 Jun 2011, Barry Smith wrote:

> > 2, I was using the '--with-debugging=0' to configure the PETSc. However, I tested the computational rate by executing the ex29.c. The non-debugging version does not improve the speed much; in the contrary, it slow down the speed a little bit. The comparison is attached here. Any idea on this.
> 
>     It depends on the compiler and particular code you are running. We recommend using the option -log_summary to see how much time is spent in each part of the computation and how much it gets better with optimization.
> 

Not sure about slowdown - but if you have prebuilt mpi with mpicc
automatically using -O2 internally - you might not see a difference
between --with-debugging=0 or 1

Satish