[petsc-users] Eigenvalue problem in batch petsc-users Digest, Vol 84, Issue 59

Marco Zocca zocca.marco at gmail.com
Fri Dec 18 04:31:34 CST 2015

Hi Venkatesh,

 it sounds like a job for the batch scheduler; again, a "bash" problem,
with some additional variables:

On a RHEL cluster, I was using Torque/PBS, which gives the `qsub`, `qstat`
commands. I would guess that Cray has analogous ones .

PETSc and SLEPc are instead toolkits for splitting the individual solutions
in bands or blocks that can be solved in parallel.

These are two distinct levels of parallelization for the total
computational task.

Best regards,

> Hi all,
> I am using Petsc and Slepc to solve my eigenvalue problem.
> I have 1000 A and B matrices saved as binary files. So I use in my script :
> *aprun -n 1 -N 1 ./ex7 -f1 A -f2 B -st_type sinvert -eps_target 0.01 *
> This is for one A and one B. So, how to do it for each A and B in multiple
> cores ?
> Pls. let me know.
> Thank you
> Venkatesh
> -------------- next part --------------
> Hi,
> I have access to Cray with many cores.
> It takes about 100 secs to solve in a single core. If I require to solve it
> sequentially, it will take a lot of time.
> Ok I can ask the admins, but in case you have an idea, pls. let me know.
> Best Regards,
> Venkatesh
> On Fri, Dec 18, 2015 at 2:32 PM, Timoth?e Nicolas <
> timothee.nicolas at gmail.com> wrote:
> > You need to be more specific, what kind of machine do you have ? If you
> > have very few cores, it will not help much to launch them all at the same
> > time, but at least you can make the thing automatic using the loop as I
> > told you. Your computer will solve the first problem and then
> automatically
> > go to the second etc etc. How much time does it take do perform your task
> > on one set of matrices A and B ?
> >
> > If you are on a cluster with many many cores, then you can probably
> launch
> > your task in parallel, but I don't know how to do this exactly. But if
> it's
> > a cluster, you can ask the administrators.
> >
> > Best
> >
> > Timothee
> >
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