[petsc-users] Cray perftools

[Adrian Croucher]

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