Jacob Domagala

This is still WIP

@rppawlo There are few tests that are meant to be Tpetra specific, but since they depend on Epetra in some ways (i.e. **Trilinos_Util_CrsMatrixGallery**) I turned them off (see [testdriver_tpetra.cpp](https://github.com/trilinos/Trilinos/pull/10921/files#diff-35b9545b79d7780c5b55d87650cd80dda61125b073f12495b61783235b4041f4R164-R192) for...

Created https://github.com/trilinos/Trilinos/pull/11069 for addressing the turned off tpetra tests

@trilinos/teko @rppawlo

ImGui being used in my 2D game engine/editor [Looper](https://github.com/JacobDomagala/Looper) 

Merged with another PR https://github.com/trilinos/Trilinos/pull/12083

Didn't notice the error before, will investigate :eyes: Thanks!

```bash for file in $files_to_check; do exclude_arg="" if [ -n "$INPUT_EXCLUDE_DIR" ]; then exclude_arg="-i$GITHUB_WORKSPACE/$INPUT_EXCLUDE_DIR" fi # Replace '/' with '_' file_name=$(echo "$file" | tr '/' '_') debug_print "Running cppcheck --project=compile_commands.json...

Results of running allreduce on std::vector with 65536 elements ``` RUNNING TEST: test_reduce (Number of runs = 25) ... Test results for test_reduce running on 16 nodes: [7] Results for...

Results of running allreduce on std::vector with 2 elems ``` Test results for test_reduce running on 16 nodes: [14] Results for test_reduce (avg: 0.147ms stdev: 0.030ms min: 0.128ms max: 0.263ms)...