<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear Barry,<div class=""><br class=""></div><div class="">thank you for the answer. That helped a lot. Just a second curiosity. </div><div class="">I’m setting A00 to be solved with preonly+lu. I obtain the following</div><div class=""><div style="margin: 0px; font-size: 13px; line-height: normal; font-family: 'Andale Mono'; color: rgb(41, 249, 20); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">ksp_0 KSPGetTotalIterations: 26</span></div><div style="margin: 0px; font-size: 13px; line-height: normal; font-family: 'Andale Mono'; color: rgb(41, 249, 20); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">ksp_1 KSPGetTotalIterations: 22</span></div><div style="margin: 0px; font-size: 13px; line-height: normal; font-family: 'Andale Mono'; color: rgb(41, 249, 20); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Residual ksp_0: 0 Reason ksp_0: 4</span></div><div style="margin: 0px; font-size: 13px; line-height: normal; font-family: 'Andale Mono'; color: rgb(41, 249, 20); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Solution ksp_0 : Convergence in 1 iterations.</span></div><div style="margin: 0px; font-size: 13px; line-height: normal; font-family: 'Andale Mono'; color: rgb(41, 249, 20); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Residual ksp_1: 5.23074e-14 Reason ksp_1: 2</span></div><div style="margin: 0px; font-size: 13px; line-height: normal; font-family: 'Andale Mono'; color: rgb(41, 249, 20); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Solution ksp_1 : Convergence in 11 iterations.</span></div><div style="margin: 0px; font-size: 13px; line-height: normal; font-family: 'Andale Mono'; color: rgb(41, 249, 20); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">Initial system linear residual: 9.904804e-09 </span></div></div><div class=""><br class=""></div><div class="">To me is clear that kps_0 iterations number is equal to 22*1+2*2. </div><div class="">But why is the iterations number for the schur complement multiplied by two?</div><div class="">I’m giving the mass matrix as a preconditioner for the schur complement.</div><div class=""><br class=""></div><div class="">Sonia</div><div class=""><br class=""><div class="">
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<br class=""><div><blockquote type="cite" class=""><div class="">On 14 Mar 2018, at 14:52, Smith, Barry F. <<a href="mailto:bsmith@mcs.anl.gov" class="">bsmith@mcs.anl.gov</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">KSPGetIterationNumber</span></div></blockquote></div><br class=""></div></body></html>