[petsc-users] PETSc on Blue Gene/Q ?

[Jed Brown]

On Wed, Feb 6, 2013 at 11:28 PM, Sean Dettrick <sdettrick at gmail.com> wrote:

> Dear Petsc Users,
>
> Does anyone have experience with running a PETSc app or benchmark on Blue
> Gene/Q?  Does PETSc compile and run?


We've been running PETSc on BG/Q for more than a year.


>  Does it link to the IBM MASS libraries?


No, it's not relevant to PETSc library functionality, but applications are
welcome to use it.


> How does a single Blue Gene CPU compare to a Xeon?


For PETSc sparse matrix-vector and vector kernels, memory bandwidth tells
90% of the story. Some applications have other parts of their code that do
a lot of flops. Note that the vectorization primitives are different
between BG and Intel.


>  Does your PETSc code scale well on BGQ?
>

BG/Q is probably the easiest architecture available for this.
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