47c9a35747
This pull request completely rewrites std::comm and all associated users. Some major bullet points * Everything now works natively * oneshots have been removed * shared ports have been removed * try_recv no longer blocks (recv_opt blocks) * constructors are now Chan::new and SharedChan::new * failure is propagated on send * stream channels are 3x faster I have acquired the following measurements on this patch. I compared against Go, but remember that Go's channels are fundamentally different than ours in that sends are by-default blocking. This means that it's not really a totally fair comparison, but it's good to see ballpark numbers for anyway ``` oneshot stream shared1 std 2.111 3.073 1.730 my 6.639 1.037 1.238 native 5.748 1.017 1.250 go8 1.774 3.575 2.948 go8-inf slow 0.837 1.376 go8-128 4.832 1.430 1.504 go1 1.528 1.439 1.251 go2 1.753 3.845 3.166 ``` I had three benchmarks: * oneshot - N times, create a "oneshot channel", send on it, then receive on it (no task spawning) * stream - N times, send from one task to another task, wait for both to complete * shared1 - create N threads, each of which sends M times, and a port receives N*M times. The rows are as follows: * `std` - the current libstd implementation (before this pull request) * `my` - this pull request's implementation (in M:N mode) * `native` - this pull request's implementation (in 1:1 mode) * `goN` - go's implementation with GOMAXPROCS=N. The only relevant value is 8 (I had 8 cores on this machine) * `goN-X` - go's implementation where the channels in question were created with buffers of size `X` to behave more similarly to rust's channels. |
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