---
myst:
    substitutions:
        macro:
            python: 1-81
            cpp: 1-4,7-78,81
        bloc1:
            python: 64-70
            cpp: 63-67
        bloc2:
            python: "35"
            cpp: "34"
        console:
            python: 2-18
            cpp: 4-20
        dedent:
            python: ":dedent: \n"
            cpp: ""
---
# Macro "**reoptimizeHollowBarCodeMultiStart.{{extension}}**"

## Objective

The objective of the macro is to optimize the section of the hollow bar defined in 
[](#reoptimizer_problem_example_problem) using the NLopt solvers (reducing it to a single-criterion 
optimisation as already explained in [](#reoptimizer_local_solver). It is largely based on the 
previous macro, the main change being the fact that we allow different starting points.

## Macro {{uranie}}

{{
    "```{literalinclude} " + parent_dir +
        "/roottest/uranie/doc/reoptimizer/use_cases/" + language + "/reoptimizeHollowBarCodeMultiStart." 
        + extension
    + "\n"
    + ":language: " + language + "\n"
    + ":lines: " + macro[language] + "\n"
    + "```"
}}
            
As stated previously, the purpose of this macro is to use different starting points for optimisation 
fully based on the macro shown in [](#use_cases_macro_reoptimizer_bar_code). The only difference is 
highlighted here:

{{
    "```{literalinclude} " + parent_dir +
        "/roottest/uranie/doc/reoptimizer/use_cases/" + language + "/reoptimizeHollowBarCodeMultiStart." 
        + extension 
    + "\n"
    + ":language: " + language + "\n"
    + ":lines: " + bloc1[language] + "\n"
    + dedent[language]
    + "```"
}}
            
The results of this is that optimisation is performed three times, using the three starting points 
provided. Here it is done sequentially, but obviously, the main idea is that it is a convenient way 
to parallelise these optimisation. This could be done for instance, simply by changing the runner 
line from

{{
    "```{literalinclude} " + parent_dir +
        "/roottest/uranie/doc/reoptimizer/use_cases/" + language + "/reoptimizeHollowBarCodeMultiStart." 
        + extension 
    + "\n"
    + ":language: " + language + "\n"
    + ":lines: " + bloc2[language] + "\n"
    + "```"
}}
            
to, for instance in our case with 3 starting points

````{only} cpp
```cpp
TThreadedRun runner(&code,4);
```
````

````{only} py
```python
runner=Relauncher.TThreadedRun(code,4)
```
````

## Console

This macro leads to the following result

{{
    "```{literalinclude} " + parent_dir +
        "/roottest/build/uranie/doc/reoptimizer/use_cases/" + language 
        + "/reoptimizeHollowBarCodeMultiStart_clean.log\n"
    + ":language: none\n"
    + ":lines: " + console[language] + "\n"
    + "```"
}}