Dear all,

we're about to implement an eigenvalue problem that needs multiple 
solutions. In particular, we're going to compute min & max eigenvalues of 
several matrices, so we were going to spawn some threads and solve some in 
parallel.

The problem is that, as far as I see, there are wrappers in deal.II for 
SLEPc, so PETSc, but we cannot use MPI in our system. PETSc works only with 
MPI, and I cannot start multiple threads, or at least that is what I 
understand (see 
https://www.mcs.anl.gov/petsc/miscellaneous/petscthreads.html).

Is there an alternative to SLEPc/PETSc for eigenproblems that is 
thread-safe? I don't know, Eigen, or others...

Thanks!
    Franco

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