<div class="gmail_quote">On Mon, Aug 20, 2012 at 10:12 AM, Matthew Knepley <span dir="ltr"><<a href="mailto:knepley@gmail.com" target="_blank">knepley@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div id=":3b">Personally, I think this is quite cumbersome compared to the Local/Global vector strategy we use in DM, and<div>does not have any real advantages.</div></div></blockquote></div><br><div>For example, storage for the ghost values is allocated for every vector duplicated from a VecGhost (e.g. the entire Krylov basis). This isn't an issue if you have large subdomains, but for smallish subdomains using methods with a fat stencil, that can double the storage needed for the Krylov basis.</div>