[petsc-users] Tao iterations

[Justin Chang]

Whatever is convenient and/or follow the "PETSc" standards. Something
similar to SNESGetIterationNumber() or KSPGetIterationNumber() would be
nice. Ideally I want my code to look like this:

ierr = TaoGetIterationNumber(tao,&its);CHKERRQ(ierr);
ierr = PetscPrintf(PETSC_COMM_WORLD, "Number of Tao iterations = %D\n",
its);

Thanks :)

On Fri, Apr 10, 2015 at 5:53 PM, Jason Sarich <jason.sarich at gmail.com>
wrote:

> Hi Justin, I'll get this in. I assume that displaying the number of
> iterations with tao_converged_reason is what you are asking for in
> particular? Or did you have something else in mind?
>
> Jason
> On Apr 10, 2015 16:42, "Smith, Barry F." <bsmith at mcs.anl.gov> wrote:
>
>>
>>   Justin,
>>
>>     Sorry TAO simply doesn't even collect this information currently. But
>> yes we should definitely make it available!
>>
>>   Jason,
>>
>>      Could you please add this; almost all the TaoSolve_xxx() have a
>> local variable iter; change that to tao->niter (I'm guess this is suppose
>> to capture this information) and add a TaoGetIterationNumber() and the uses
>> can access this. Also modify at the end of TaoSolve() -tao_converged_reason
>> to also print the iteration count. At the same time since you add this you
>> can add a tao->totalits which would accumulate all iterations over all the
>> solves for that Tao object and the routine TaoGetTotalIterations() to
>> access this.  Note that TaoSolve() would initialize tao->niter = 0 at the
>> top.
>>
>>    Thanks
>>
>>   Barry
>>
>>
>>
>> > On Apr 10, 2015, at 4:16 PM, Justin Chang <jchang27 at uh.edu> wrote:
>> >
>> > Hi all,
>> >
>> > Is there a way to generically obtain the number of Tao iterations? I am
>> looking through the -help options for Tao and I don't see any metric where
>> you can output this quantity in the manner that you could for SNES or KSP
>> solves. I am currently using blmvm and tron, and the only way I can see
>> getting this metric is by outputting -tao_view and/or -tao_monitor and
>> manually finding this number. I find this cumbersome especially for
>> transient problems where I would like to simply have this number printed
>> for each step instead of ending up with unnecessary info.
>> >
>> > Thanks,
>> >
>> >
>> > --
>> > Justin Chang
>> > PhD Candidate, Civil Engineering - Computational Sciences
>> > University of Houston, Department of Civil and Environmental Engineering
>> > Houston, TX 77004
>> > (512) 963-3262
>>
>>
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