Async::Reactor#run_once time #143
Description
In testing moving a Goliath/EventMachine app to Falcon/Async, we found that request using async-http was a bit slower. In profiling async-http, I noticed 89% of the time was taken in Async::Reactor#run_once. It's not clear to me if this is just waiting for the HTTP response or if something else is going on. If waiting for response, the response from httpbin.org averages 62ms, where Async::Reactor#run_once takes approximately 260ms.
ruby 2.7
async-http 0.60.2
async 1.31.0
require 'async'
require 'async/http/internet'
require 'ruby-prof-flamegraph'
def ruby_prof_wrapper
RubyProf.start
results = yield
result = RubyProf.stop
printer = RubyProf::FlameGraphPrinter.new(result)
dir = File.dirname(__FILE__)
file = File.join(dir, "profile-#{Time.now.to_i}.data")
File.open(file, 'w') {|file| printer.print(file)}
results
end
data = {'life' => 42}
Async do
internet = nil
ruby_prof_wrapper do
# Make a new internet:
internet = Async::HTTP::Internet.new
# Prepare the request:
headers = [['accept', 'application/json']]
body = [JSON.dump(data)]
# Issues a POST request:
response = internet.post("https://httpbin.org/anything", headers, body)
# Save the response body to a local file:
pp JSON.parse(response.read)
end
ensure
# The internet is closed for business:
internet.close
end