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Hi, Sorry to hijack this thread but I just want to add that this is a more general problem that I constantly face with PETSc. Not being able to checkpoint the complete state of a solver instance and restart a computation (at least not easily)
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Hi,
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<div>Sorry to hijack this thread but I just want to add that this is a more general problem that I constantly face with PETSc. Not being able to checkpoint the complete state of a solver instance and restart a computation (at least not easily) has long been
the biggest missing feature in PETSc for me.</div>
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<div>Thanks,</div>
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<div>Samar</div>
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<blockquote type="cite">
<div>On Jun 24, 2024, at 9:14 AM, Jose E. Roman via petsc-users <petsc-users@mcs.anl.gov> wrote:</div>
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<pre style="caret-color: rgb(0, 0, 0); font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: sans-serif; white-space: pre-wrap; overflow-wrap: break-word;">Unfortunately there is no support for this.
If you requested several eigenvalues and the solver has converged some of them already, then it would be possible to stop the run, save the eigenvectors and rerun with the eigenvectors passed via EPSSetDeflationSpace().
Jose
> El 24 jun 2024, a las 0:21, Marildo Kola <<a href="mailto:marildo.kola@gmail.com">marildo.kola@gmail.com</a>> escribió:
>
> This Message Is From an External Sender
> This message came from outside your organization.
> Hello,
> I am using SLEPc to calculate eigenvalues for fluid dynamics stability analysis (specifically studying bifurcations). We employ a MatShellOperation, which involves propagating Navier-Stokes to construct the Krylov space, and this particularly slows down our algorithm. The problem I am facing is that, after days of simulations, the simulation may die due to a time limit on the cluster, but the eigensolver (I am using the default Krylov-Schur) has not converged yet, leading to the loss of all the information computed up to that point. I wanted to inquire if it is possible to implement, with the available features, a restarting strategy, which can allow me, once the simulation stops (or after a given number of restart iterations of the solver), to save all the information necessary to restart the EPSSolver from the point it had stopped.
> Thank you in advance,
> Best regards, Marildo Kola
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