Golang Runtime and Concurrency

• Golang uses a user-space component (runtime) linked to the executable.
• The runtime is written in C.
• It has implementation of scheduler, goroutine management and OS-threads management.
• Per go process, there is a max limit of OS threads.
• Go runtime schedules N goroutines on M OS threads
• One goroutine runs exactly on one thread.
• A goroutine can get blocked (e.g. on a syscall) and blocks the OS-thread too.

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References

• https://groups.google.com/forum/#!msg/golang-nuts/j51G7ieoKh4/wxNaKkFEfvcJ
• http://www.cs.columbia.edu/~aho/cs6998/reports/12-12-11_DeshpandeSponslerWeiss_GO.pdf
• https://en.wikipedia.org/wiki/Communicating_sequential_processes