Escape analysis is not a rule of thumb
The compiler said "does not escape" and the benchmark reported 104 KiB per operation. Both were right. What -gcflags=-m actually tells you.
Writing
Long-form notes on the Go runtime, concurrency, performance and the systems underneath.
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What the Go scheduler does when your goroutine blocks
A blocking syscall costs an OS thread. A blocking network read costs nothing. Measured with 200 goroutines, GOMAXPROCS=2 and a thread count.