I'm not who you're responding to, but... > Go can serve about 500M users per month on Xeon E3 v2 CPUs. > Why, except for HA do you need more? Because not ever

I'm not who you're responding to, but... > Go can serve about 500M users per month on Xeon E3 v2 CPUs. > Why, except for HA do you need more? Because not everything is a simple CRUD website. The last place I worked had a website that appeared to only be moderately more complex than such a site, and had well under 500M users per month. But parts of the application involved complicated processing of many dozens of TBs per day of newly collected data to optimize the content being served (some stream processing, some batch). We had multiple clusters of 1,000+ machines coming and going for an hour or two at a time (often overlapping).