PETSc solvers will cache any setup computations, like a matrix factorization, and will reuse them on subsequent solves.
If you call KSPSetOperators, PETSc will assume its cache is invalid and redo any required setup on subsequent solves. Mark On Tue, Apr 9, 2019 at 4:08 AM ztdepyahoo via petsc-users < [email protected]> wrote: > Dear group: > I need to solve a Laplacian problem Ax=b every time step where A is > a constant . I want to store the inverse of A at the first time step. > how to do with Petsc > Regards > > ztdepyahoo > [email protected] > > <https://maas.mail.163.com/dashi-web-extend/html/proSignature.html?ftlId=1&name=ztdepyahoo&uid=ztdepyahoo%40gmail.com&iconUrl=https%3A%2F%2Fmail-online.nosdn.127.net%2Fqiyelogo%2FdefaultAvatar.png&items=%5B%22ztdepyahoo%40gmail.com%22%5D> > 签名由 网易邮箱大师 <https://mail.163.com/dashi/dlpro.html?from=mail81> 定制 >
