<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div><div></div><div><br class=""></div><blockquote type="cite" class=""><div class=""><div dir="ltr" class=""><div class="gmail_quote"><div class=""> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word;line-break:after-white-space" class=""><div class=""><blockquote type="cite" class=""><div class=""><div dir="ltr" style="font-family:Helvetica;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration:none" class=""><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">>> 2) have the sub_0_ and the sub_1_ work on two different nonoverlapping communicators of size PETSC_COMM_WORLD/2, do the solve concurrently, and then sum the solutions (only worth doing because of -pc_composite_type additive). I have no idea if this easily doable with PETSc command line arguments<br class="">><span class="m_-5551793458628865409Apple-converted-space"> </span><br class="">> 1) is the more flexible approach, as you have better control over the system sizes after 'telescoping’.<br class=""><br class="">Right, but the advantage of 2) is that I wouldn't have one half or more of processes idling and I could overlap the solves of both subpc in the PCCOMPOSITE.<br class=""><br class="">I’m attaching the -log_view for both runs (I trimmed some options).<br class=""><br class="">Thanks for your help,<br class="">Pierre<br class=""><br class=""><br class="">> Best regards,<br class="">> Karli</blockquote></div></div></div></blockquote></div><br class=""></div></blockquote></div></div>
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