<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><br><div><div>On May 28, 2012, at 3:20 PM, Jed Brown wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div class="gmail_quote">On Mon, May 28, 2012 at 5:19 AM, Hui Zhang <span dir="ltr"><<a href="mailto:mike.hui.zhang@hotmail.com" target="_blank">mike.hui.zhang@hotmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Sorry for repost the following question, but after reading composite.c and asm.c,<br>
I can not understand. I observed that my subroutine for modifying submatrices of PCASM was<br>
called twice. In composite.c it seems there is no calling of PCSetUp on its componential PC's.<br>
In asm.c, the PCSetUp_ASM first determines whether pc->setupcalled is true.<br>
<br>
I think this is a general question for PCComposite say pc. If it consists of two pc's pc0, pc1<br>
and I have PCSetUp(pc0), I would not expect pc0 to be SetUp again. I can not understand<br>
in my case why PCASM seems SetUp twice.<br></blockquote><div><br></div><div>Does the routine do anything or just return immediately? If nothing has been changed since the last time a PC was set up, it should return immediately. If you have changed some configuration, it may need to be set up again.</div></div></blockquote><div><br></div><div>Thanks. But I said something wrong. The source code asm.c does call the ModifySubMatrices</div><div>whenever PCSetUp is called on PCASM, no matter whether it was called before. So this </div><div>explains my observation (two calls of ModifySubMatrices). My new question is: can you</div><div>add a user control to determine whether <span class="Apple-style-span" style="font-family: Menlo; font-size: 11px; ">MatGetSubMatrices and </span><span class="Apple-style-span" style="font-family: Menlo; font-size: 11px; ">PCModifySubMatrices </span></div><div><font class="Apple-style-span" face="Menlo"><span class="Apple-style-span" style="font-size: 11px;">should be called inside PCSetUp_ASM ? But maybe this is too invasive and not</span></font></div><div><font class="Apple-style-span" face="Menlo"><span class="Apple-style-span" style="font-size: 11px;">very useful to most people (although useful to me).</span></font></div><div><br></div><br><blockquote type="cite"><div class="gmail_quote">
<div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Thanks!<br>
Hui<br>
<br>
<br>
> I have got a new question. I'm now constructing a PCComposite from PCASM and another PCKSP (coarse<br>
> problem). And construction of PCKSP needs to use the subksp's of PCASM. So I need to PCSetUp on the<br>
> PCASM, right? But the KSP using PCComposite would setup PCASM again. How can I avoid twice setup<br>
> of PCASM ?<br>
<br>
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