you are running with 64-core KNL
> nodes, there are 4*64 = 256 logical processors available, because each core
> supports four hardware threads. Asking for logical processors 0-63 might
> not actually be using all of the cores, as, depending on the BIOS numbering
> (which can be arbitrary), s
:48, Jose E. Roman ()
escribió:
> Everything seems correct. I don't know, maybe your problem is very
> sensitive? Is the eigenvalue tiny?
> I would still try with Krylov-Schur.
> Jose
>
>
> > El 24 oct 2018, a las 14:59, Ale Foggia escribió:
> >
> > Th
El mar., 23 oct. 2018 a las 13:53, Matthew Knepley ()
escribió:
> On Tue, Oct 23, 2018 at 6:24 AM Ale Foggia wrote:
>
>> Hello,
>>
>> I'm currently using Lanczos solver (EPSLANCZOS) to get the smallest real
>> eigenvalue (EPS_SMALLEST_REAL) of a Hermitian problem (E
ault options is too sensitive (by default it does
> not reorthogonalize). Suggest using Krylov-Schur or Lanczos with full
> reorthogonalization (EPSLanczosSetReorthog).
> Also, send the output of -eps_view to see if there is anything abnormal.
>
> Jose
>
>
> > El 24 oct
23 oct 2018, a las 15:46, Ale Foggia escribió:
> >
> >
> >
> > El mar., 23 oct. 2018 a las 15:33, Jose E. Roman ()
> escribió:
> >
> >
> > > El 23 oct 2018, a las 15:17, Ale Foggia escribió:
> > >
> > > Hello Jose, thanks for your answ
El mar., 23 oct. 2018 a las 15:33, Jose E. Roman ()
escribió:
>
>
> > El 23 oct 2018, a las 15:17, Ale Foggia escribió:
> >
> > Hello Jose, thanks for your answer.
> >
> > El mar., 23 oct. 2018 a las 12:59, Jose E. Roman ()
> escrib
. Is there
another easier (or with less computations) way to get this?
> Jose
>
>
>
> > El 23 oct 2018, a las 12:13, Ale Foggia escribió:
> >
> > Hello,
> >
> > I'm currently using Lanczos solver (EPSLANCZOS) to get the smallest real
> eigenvalue (EPS_SMALLEST_
Hello,
I'm currently using Lanczos solver (EPSLANCZOS) to get the smallest real
eigenvalue (EPS_SMALLEST_REAL) of a Hermitian problem (EPS_HEP). Those are
the only options I set for the solver. My aim is to be able to
predict/estimate the time-to-solution. To do so, I was doing a scaling of
the
of the memory I need for a
particular size of the problem. Thank you very much for all your answers
and suggestions.
El vie., 5 oct. 2018 a las 9:38, Jose E. Roman ()
escribió:
>
>
> > El 4 oct 2018, a las 19:54, Ale Foggia escribió:
> >
> > Jose:
> > - By eac
> - I would suggest using the default solver Krylov-Schur - it will do
> Lanczos with implicit restart, which will give faster convergence than the
> EPSLANCZOS solver.
>
> Jose
>
>
> > El 4 oct 2018, a las 12:49, Matthew Knepley
> escribió:
> >
> > On Thu, Oct 4, 201
Hello all,
I'm using SLEPc 3.9.2 (and PETSc 3.9.3) to get the EPS_SMALLEST_REAL of a
matrix with the following characteristics:
* type: real, Hermitian, sparse
* linear size: 2333606220
* distributed in 2048 processes (64 nodes, 32 procs per node)
My code first preallocates the necessary memory
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