When running on baremetal, however, we found two key limitations of the Go runtime so far: Systems with a lot of RAM can have a lot of allocations, prompting the Go Garbage Collector to aggressively steal CPU. 2. Applications performing hundreds of thousands of requests per second may make use of thousands of TCP sockets, bottlenecking the Go runtime’s network backend on syscalls.

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Bluesky scaled their Golang service to 192 cores with heavy I/O by using ScyllaDB and Redis for the V2 Dataplane, optimizing garbage collection and resolving a Netpoll Epoll dilemma.

Scaling Golang to 192 Cores with Heavy I/O