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# Time, Accuracy, Speed Analysis (TAS)
```{highlight} none
```
Below is the guide to running TAS using ex13, which is a Poisson Problem in 2D and 3D with Finite Elements:
1. Compile `ex13.c`
> 1. This example source file, and the corresponding `makefile` are located in `PETSC_DIR/src/snes/tutorials/`
>
> 2. Compile with the command:
>
> > ```console
> > $ make ex13
> > ```
2. Run ex13 with the following command:
```
mpiexec -n 2 ./ex13 -log_view :/home/<user name>/PETSC_DIR/lib/petsc/bin/ex_13_test.py:ascii_info_detail \
-dm_distribute \
-dm_plex_box_faces 8,8 \
-potential_petscspace_degree 1 \
-snes_convergence_estimate \
-convest_num_refine 5
```
3. A log file in the above directory called `ex_13_test.py` should now be present. This is also the same directory that contains the TAS python3 script `petsc_tas_analysis.py`
4. Now run `petsc_tas_analysis.py`:
```
./petsc_tas_analysis.py -f ex_13_test
```
5. You should see something similar to the following in your terminal window:
> ```{literalinclude} exampleTASOutPut.txt
> ```
6. Finally the graphs will appear in the subdirectory `graphs/`
For more detailed help in using TAS:
: 1. See detailed user's guide
2. On the command line use `./petsc_tas_analysis.py -h`
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