On: Thoughts on Rust, a few thousand lines in

[pcwalton]

Context switches on I/O are the same for 1:1 and M:N because you're eating the cost of a kernel to user context switch either way.

Memory usage per thread is a property of the GC, not M:N threading. You can have very small stacks in a 1:1 implementation too.

[skyde → pcwalton]

there is less context switches because you cant write some data to several distinct file descriptor using a single system call.

You can also read data from several file descriptor in a single System Call.

This way you significantly reduce the number of System call instead of doing one blocking read() per connection. I believe context switch round trip (from user space to kernel to user space) is much more expensive than simply switching between goroutine of the same process.