BMI: Difference between revisions

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(Description of the CSDMS BMI)
 
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== IRF Functions ==
{{PageTitle| Basic Model Interface (BMI) }}
<syntaxhighlight lang=sidl>
opaque initialize( in string config_file )  
void update( in double dt ) //  (Advance model variables by one time step.)
void finalize()
void run_model( in string config_file ) //  (Do a complete model run. Not needed for CMI.))
</syntaxhighlight>


== Model description ==
<div class=AutoScaleImage>[[ File:Bmi-logo-below-lowercase.png | 325 px | right ]]</div>
<syntaxhighlight lang=sidl>
array<string> get_input_var_names()
array<string> get_output_var_names()
string get_attribute( in string att_name ) // (for mesh_type, time_step_type, etc.)
string get_model_name() // (absorbed this into get_attribute()
</syntaxhighlight>


== Variable description ==
'''Version 2.0'''
<syntaxhighlight lang=sidl>
string get_var_type( in string long_var_name ) // ( returns type_string, e.g. ‘double’)
string get_var_units( in string long_var_name ) // ( returns unit_string, e.g. ‘meters’ )
int get_var_rank( in string long_var_name ) // ( returns array rank or 0 for scalar)
string get_var_name( in string long_var_name ) // ( returns model’s internal, short name )
double get_time_step() // (returns the model’s current timestep;  adaptive or fixed.)
string get_time_units() // (returns unit string for model time, e.g. ‘seconds’, ‘years’)
double get_start_time()
double get_current_time()
double get_end_time()
</syntaxhighlight>


== Variable getters and setters ==
Automobiles benefit from a standard interface--regardless of whether you drive a pickup truck or an electric two-seater,
<syntaxhighlight lang=sidl>
you have an ignition, an accelerator, and steering wheel.
double get_0d_double( in string long_var_name )
Imagine spending weeks of study to switch from one type of automobile to another,
array<double> get_1d_double( in string long_var_name  )
or from one brand to another.
array<double,2> get_2d_double( in string long_var_name )
At CSDMS,
array<double> get_2d_double_at_indices( in string long_var_name, array<int> indices )
we believe that numerical models, and the sub-components that make up these models, should offer a similar kind of standardization.
void set_0d_double( in string long_var_name, in double scalar )
To this end, we have developed the Basic Model Interface (BMI): a set of standard query and control functions that, when added to a model code, make that model both easier to learn and easier to couple with other software.
void set_1d_double( in string long_var_name, in array<double> array)
void set_2d_double( in string long_var_name, in array<double,2> array)
void set_2d_double_at_indices( in string long_var_name, in array<int> indices, in array<double,2> array)
</syntaxhighlight>


== Grid description ==
BMI is an element of the [[Workbench|CSDMS Workbench]], an integrated system of software tools, technologies, and standards for building and coupling models.


=== Uniform Rectilinear ===
== Links ==
<syntaxhighlight lang=sidl>
array<double, 1> get_grid_spacing (in string long_var_name)
array<double, 1> get_grid_lower_left_corner (in string long_var_name)      # (SDP. I added “_left”.)
array<int, 1> get_grid_shape (in string long_var_name)
</syntaxhighlight>


=== Rectilinear ===
* The latest [http://bmi.readthedocs.io/ BMI documentation], including the [https://bmi.readthedocs.io/en/latest/bmi.getting_started.html Getting Started Guide] and [https://bmi.readthedocs.io/en/latest/bmi.best_practices.html BMI Best Practices].
<syntaxhighlight lang=sidl>
* The central BMI repository on [https://github.com/csdms/bmi GitHub]: Go here to contribute to BMI, ask a BMI-related question, or submit an issue.
array<double, 1> get_grid_x (in string long_var_name)
* The BMI 2.0 language specifications for [https://github.com/csdms/bmi-c C], [https://github.com/csdms/bmi-cxx C++], [https://github.com/csdms/bmi-fortran Fortran], [https://github.com/csdms/bmi-java Java], and [https://github.com/csdms/bmi-python Python]. If you have a model in one of these supported languages, implement the corresponding spec to create a BMI.
array<double, 1> get_grid_y (in string long_var_name)
* Sample implementations in [https://github.com/csdms/bmi-example-c C], [https://github.com/csdms/bmi-example-cxx C++], [https://github.com/csdms/bmi-example-fortran Fortran], [https://github.com/csdms/bmi-example-java Java], and [https://github.com/csdms/bmi-example-python Python]. These examples demonstrate how to implement a BMI for a simple model.
array<double, 1> get_grid_z (in string long_var_name)
* The [http://www.sciencedirect.com/science/article/pii/S0098300412001252 Peckham et al. (2013) article] in ''Computers & Geosciences'' where the concept of BMI was proposed.
array<int, 1> get_grid_shape (in string long_var_name)
* The [https://joss.theoj.org/papers/10.21105/joss.02317 Hutton et al. (2020) article] in ''Journal of Open Source Software'' describing BMI 2.0.
</syntaxhighlight>


=== Structured Mesh ===
== Citation ==
<syntaxhighlight lang=sidl>
array<double, 1> get_grid_vertices (in string long_var_name)
array<int, 1> get_grid_shape (in string long_var_name)
</syntaxhighlight>


=== Unstructured Mesh ===
If you use BMI in your work, please cite:
<syntaxhighlight lang=sidl>
 
array<double, 1> get_grid_vertices (in string long_var_name)
* Hutton, E.W.H., Piper, M.D., and Tucker, G.E., 2020. The Basic Model Interface 2.0: A standard interface for coupling numerical models in the geosciences. ''Journal of Open Source Software'', '''5(51)''', 2317, https://doi.org/10.21105/joss.02317.
array<int, 1> get_grid_connectivity (in string long_var_name)
 
array<int, 1> get_grid_offset (in string long_var_name)
* Peckham, S.D., Hutton, E.W., and Norris, B., 2013. A component-based approach to integrated modeling in the geosciences: The design of CSDMS. ''Computers & Geosciences'', '''53''', pp.3-12, http://dx.doi.org/10.1016/j.cageo.2012.04.002.
</syntaxhighlight>

Latest revision as of 14:31, 3 January 2024

Basic Model Interface (BMI)
Bmi-logo-below-lowercase.png

Version 2.0

Automobiles benefit from a standard interface--regardless of whether you drive a pickup truck or an electric two-seater, you have an ignition, an accelerator, and steering wheel. Imagine spending weeks of study to switch from one type of automobile to another, or from one brand to another. At CSDMS, we believe that numerical models, and the sub-components that make up these models, should offer a similar kind of standardization. To this end, we have developed the Basic Model Interface (BMI): a set of standard query and control functions that, when added to a model code, make that model both easier to learn and easier to couple with other software.

BMI is an element of the CSDMS Workbench, an integrated system of software tools, technologies, and standards for building and coupling models.

Links

Citation

If you use BMI in your work, please cite:

  • Hutton, E.W.H., Piper, M.D., and Tucker, G.E., 2020. The Basic Model Interface 2.0: A standard interface for coupling numerical models in the geosciences. Journal of Open Source Software, 5(51), 2317, https://doi.org/10.21105/joss.02317.
  • Peckham, S.D., Hutton, E.W., and Norris, B., 2013. A component-based approach to integrated modeling in the geosciences: The design of CSDMS. Computers & Geosciences, 53, pp.3-12, http://dx.doi.org/10.1016/j.cageo.2012.04.002.
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