| No beginner routines | ||
| Intermediate - Setting options for algorithms and data structures | PetscCommGetThreadComm | |
| Advanced - Setting more advanced options and customization | PetscThreadCommRegisterAll | PetscThreadCommRegister |
| Developer - Interfaces intended primarily for library developers, not for typical applications programmers | PetscGetNCores | PetscThreadCommGetScalars | PetscThreadReductionBegin |
| PetscThreadCommFinalizePackage | PetscThreadCommInitializePackage | PetscThreadReductionEnd |
| PetscThreadCommGetAffinities | PetscThreadCommRunKernel | |
| PetscThreadCommGetNThreads | PetscThreadCommView | |
| No deprecated routines | ||