The Crystal programming language | http://crystal-lang.org | Fund Crystal's development: http://is.gd/X7PRtI | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/
I'm trying to do a usual TCP echo server in Crystal to compare it (on local machine) to the Ruby version.
Everything is ok in terms of scalabilty, but for some reason no matter how many fibers spawned (or without fibers at all, serving only one connection) I get 44ms response time. To compare: echo server in Ruby (with nio4r in use, but still) gives some microseconds instead, but fails at serving a lot of connections.
I've also tried Elixir and again latency was absolutely ok, a few microseconds or so.
So what can be wrong with Crystal in that case, am I missing something? Here's the snippet I'm using:
require "socket"
def process(client)
client.tcp_nodelay = true
while msg = client.gets
client.puts(msg)
end
end
server = TCPServer.new "localhost", 1234
loop { spawn process(server.accept) }tcp_nodelay = true dropped the latency from 88ms to 44ms for me.so I might be missing some additional configuration required for a fast connectivity
@slava-dzyba how do you test the speed? I get something more like 30-40 nanoseconds for this echo server code. my little tester:
require "socket"
require "benchmark"
client = TCPSocket.new "localhost", 1234
payload = "Hello world" * 1_000
time = Benchmark.measure do
client.puts payload
client.gets
end
puts timeSample output: 0.000000 0.000000 0.000000 ( 0.000048)
Does anyone have experience working with the parser? There aren't any comments or guides and I would like to make an addition.
Basically, I was thinking it would be cool to be able to splat a tuple just like you can in a method definition, but during multiple assignment. Like this:
head, *tail = {"Seattle", "Hong Kong", "London"}
head # => "Seattle"
tail # => {"Hong Kong", "London"}def splat(head, *tail)
{head, tail}
end
head, tail = splat(*{"Seattle", "Hong Kong", "London"})
pp head
pp tailDoes anyone have experience working with the parser?
https://github.com/crystal-jp/techbookfest2/tree/master/makenowjust by @MakeNowJust but in Japanesse :sweat_smile:
