initial upload

test/old_tests/only_source/README.md

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+# Example for Solver only mode
+
+This example shows how to use the Solver only mode of the tool.
+
+## compile TOMOATT with solver_only executable
+
+Uncomment "src/TOMOATT_solver_only.cxx" and "src/TOMOATT_2d_precalc.cxx" in CMakeLists.txt to compile the solver_only executable as below.
+
+```cmake
+# add one by one
+set(APP_SOURCES
+  src/TOMOATT.cxx
+  src/TOMOATT_solver_only.cxx
+  src/TOMOATT_2d_precalc.cxx
+  #src/SrcRecWeight.cxx
+  )
+```
+
+Then recompile the code in the build directory.
+
+
+## pre calculation of source boudary conditions
+
+As the 2d solver is not parallelized for one single teleseismic source yet, what user can do is calculate multiple teleseismic sources at the same time using simultaneous run.
+The precalculation of source boundary conditions can be done by running the following command:
+
+```bash
+mpirun -n 8 ../../build/bin/TOMOATT_2d_precalc -i input_params_pre.yml
+```
+
+## run the solver_only executable
+
+Before running the solver_only executable, you need to prepare the input files by running:
+    
+```python
+python make_test_model.py
+```
+
+This creates a src_only_test.dat which includes 8 sources without any receiver.
+
+Then run the solver_only executable as below.
+
+```bash
+mpirun -n 8 ../../build/bin/TOMOATT_solver_only -i src_only_test.dat
+```
+
+## check the output files
+The result file can be visualize with paraview:
+```bash
+paraview OUTPUT_FILES/out_data_sim.xmf
+```
+or directly open with python etc. Please refer the check_3d_out.ipynb for more details.