-* **When running in MPI parallel mode** (i.e., with a MPI communicator different from `MPI.COMM_SELF`), `GridapPETSc` implements a sort of limited garbage collector in order to automatically deallocate PETSc objects. This garbage collector can be manually triggered by a call to the function `GridapPETSc.gridap_petsc_gc()`. `GridapPETSc` automatically calls this function inside at different strategic points, and **this will be sufficient for most applications**. However, for some applications, with a very frequent allocation of PETSc objects, it might be needed to call this function from application code. This need will be signaled by PETSc via the following internal message error `PETSC ERROR: No more room in array, limit 256
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