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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Sorry but I am not sure I need to be in all these communications.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> petsc-dev-bounces@mcs.anl.gov [mailto:petsc-dev-bounces@mcs.anl.gov]
<b>On Behalf Of </b>Mark F. Adams<br>
<b>Sent:</b> Friday, March 22, 2013 8:15 AM<br>
<b>To:</b> For users of the development version of PETSc<br>
<b>Subject:</b> Re: [petsc-dev] petsc/petsc added -pc_use_amat option to PCSetFromOptions() (commit b9ee023)<o:p></o:p></span></p>
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<p class="MsoNormal">On Mar 21, 2013, at 10:07 PM, Jed Brown <<a href="mailto:jedbrown@mcs.anl.gov">jedbrown@mcs.anl.gov</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">On Thu, Mar 21, 2013 at 3:31 PM, Barry Smith <<a href="mailto:bsmith@mcs.anl.gov" target="_blank">bsmith@mcs.anl.gov</a>> wrote:<o:p></o:p></p>
<p class="MsoNormal">> Why isn't this `PetscOptionsList()` so that it shows up in `-help`?<br>
<br>
My mistake, I cut and pasted the PetscOptionsGetInt() from the line above and figure that it mustn't be in a PetscOptionsBegin{} phase. You can fix it if you like.<o:p></o:p></p>
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Hmm, problem is deeper than that. If the method has no sub-solver, wouldn't we rather not be checking this option, so that it shows up as an unused option?
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<p class="MsoNormal">I thought the primary mission of options_left was to catch spelling mistakes.<o:p></o:p></p>
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<p class="MsoNormal">(This is also useful if a PC logically ought to pay attention to this option, but isn't.) What about making PCSetUseAmat() use PetscTryMethod() and move the check of "-pc_use_amat" into each implementation?<o:p></o:p></p>
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<p class="MsoNormal">I agree with Barry that it should be high level and make it there for any PC to use if they want.<o:p></o:p></p>
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<p class="MsoNormal">Do we really want to leave the confusing option in place for all the PCs that don't have inner solvers?<o:p></o:p></p>
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<p class="MsoNormal">It just doesn't seem that bad to me.<o:p></o:p></p>
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