[jlarocco]

> Concurrency is dead simple in Go - and if you want to do 5 different requests to ElasticSearch in parallel and merge the results when all of them are finished (like we do for Universal Search), that's just a few lines of very readable Go. Try that with a GIL, sure, multithreaded Python and Ruby is possible, but it's not for the faint hearted and not as easy to read.

This example is terrible. Waiting for DB responses, ElasticSearch queries, and long running IO is one place where Python and Ruby multi-threading with a GIL works great. A GIL means multiple threads can't execute Python code at the same time. All of those tasks are by definition NOT running Python code, they're sitting around blocked waiting for responses.

A better example would be something like image processing, where an image is loaded into memory, broken into multiple independent chunks, and each chunk is processed at the same time in multiple threads. In Go that should work just fine, but in Python and Ruby each thread will spend a lot of time waiting for the GIL.