<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hi,<div><br></div><div>I am using an augmented Lagrangian approach that requires to solve multiple times a system with the same Stiffness matrix but different right hand sides:</div><div><br></div><div>K U1 = F1</div><div>K U2 = F2</div><div>…</div><div>K UN = FN</div><div><br></div><div>I am using MUMPS right now, and I would like to do the analysis and factorization only once (to compute U1), and then only call the back substitution in order to speed up the convergence.</div><div>Is there any option in PETSc to do that? If yes, would it work with other direct solvers (cholmod, Pardiso)?</div><div><br></div><div>Thanks a lot for your help</div><div><div apple-content-edited="true">
<div style="color: rgb(0, 0, 0); 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; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div style="color: rgb(0, 0, 0); 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; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div style="color: rgb(0, 0, 0); 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; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div style="color: rgb(0, 0, 0); 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; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">--<br>Mathieu Morlighem<br><br>Assistant Professor<br>Department of Earth System Science<br>University of California, Irvine<br>3218 Croul Hall, Irvine, CA 92697-3100<br><a href="mailto:Mathieu.Morlighem@uci.edu">Mathieu.Morlighem@uci.edu</a></div></div></div></div>
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