Hi Barry, <br>Thank you very much for the confirm.<br><br>Yan<br><br><div class="gmail_quote">On Thu, Dec 10, 2009 at 3:12 PM, Barry Smith <span dir="ltr"><<a href="mailto:bsmith@mcs.anl.gov">bsmith@mcs.anl.gov</a>></span> wrote:<br>
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On Dec 10, 2009, at 2:09 PM, Ryan Yan wrote:<br>
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Hi all,<br>
I was looking at the ex22 of ksp.<br>
<br>
If I call:<br>
...<br>
ierr = DMMGCreate(PETSC_COMM_WORLD,3,PETSC_NULL,&dmmg);CHKERRQ(ierr);<br>
ierr = DACreate3d(PETSC_COMM_WORLD,DA_NONPERIODIC,DA_STENCIL_STAR,-3,-3,-3,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,1,1,0,0,0,&da);CHKERRQ(ierr);<br>
...<br>
<br>
How many grid pts should I have on the finest level? Is it 27, considering I am set 3 as the global dimension in each direction of the array?<br>
<br>
When I run ex22 with -ksp_view, I saw that on the finest level there are 9 pts on each direction.<br>
<br>
Is that because I have 3 level?<br>
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Yes. The DA you create initially is for the coarsest grid, finer ones are automatically created by the DMMG.<br>
<br>
Barry<br>
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<br>
Yan<br>
<br>
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