run vs errgroup

I typically don’t do much with concurrency in Go, but messed around this morning with both oklog/run and sync/errgroup.

I’ve defaulted to using oklog/run in the past, but I realized that while they have similar interfaces, they’re useful for different things:

• oklog/run is useful for long-running processes.
  • think starting up http servers alongside other components, and waiting for one to finish, in which case all other components are signalled to finish.
• sync/errgroup is useful for short-lived, parallel processes.
  • think units of work to be done in parallel, where one process resulting in an error should stop the entire computation.