Merge pull request #152 from markus-gsf-seidl/feature/132-use-compile…

…d-languages

Using Complied Languages rather than Interpreted Languages #132

docs/catalog/cloud/use-compiled-languages.md

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+---
+version: 1.0
+submitted_by: markus-ntt-seidl
+published_date: TBD
+category: cloud
+tags: 
+ - cloud
+ - role:cloud-engineer
+ - size:small
+ - programming-language
+
+---
+
+# Use compiled languages
+
+## Description
+
+Interpreted languages need to be parsed, compiled and executed when the application starts or a workload arrives. This tends to be more energy heavy then when a compiled language is used. The compilation is then only done once, saving on resources.
+
+## Solution
+
+Use compiled languages (like Go, Rust, Java or others) whenever possible or compile interpreted languages.
+
+
+## SCI Impact
+
+`SCI = (E * I) + M per R`  
+[Software Carbon Intensity Spec](https://grnsft.org/sci)
+
+Concerning the SCI equation, use compiled languages will impact as follows:
+
+- `E`: Running compiled binaries is more energy efficient and uses less energy which outweighs the energy consumed in compiling it to binary upfront
+- `M`: The embodied carbon emissions will be reduced, as compiled binaries tend to be smaller then the sources they are compiled from
+
+## Assumptions
+
+- There is the assumption that the execution environment allows usage of compiled languages, this is not always the case (for example web browsers)
+- Use benchmarks to determine if the application use case benefits from using a compiled language.
+
+## Considerations
+
+- Some interpreted languages provide ways to be compiled into binary (for example GraalVM for Java, Python and more)
+- Consider factoring in compile time when doing benchmarks 
+
+## References
+
+- [One Carbon intensity benchmark](https://greenlab.di.uminho.pt/wp-content/uploads/2017/10/sleFinal.pdf)
+