[petsc-users] Cray perftools

[Barry Smith]

  Have any of the modules loaded changed? Or the shared libraries that are in any of the modules?

> On Feb 21, 2022, at 5:38 PM, Adrian Croucher <a.croucher at auckland.ac.nz> wrote:
> 
> hi,
> 
> We have our PETSc-based code compiled on a Cray XC-50 machine, and it has just recently started running about 2.5 times slower on there. Neither the code nor PETSc has been recompiled lately.
> 
> Turning the PETSc logging on, it appears to be spending more time on I/O than it used to.
> 
> The cluster admins have suggested we rebuild with the Cray "perftools" module loaded to get profiling info. It's a slight hassle to rebuild everything, so I wondered, would this actually tell us anything that we don't already know from the PETSc logs?
> 
> - Adrian
> 
> -- 
> Dr Adrian Croucher
> Senior Research Fellow
> Department of Engineering Science
> University of Auckland, New Zealand
> email: a.croucher at auckland.ac.nz
> tel: +64 (0)9 923 4611
>