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May 5, 2017 05:51
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module Enumerable | |
def first_to_finish | |
threads = collect { |args| Thread.new { yield(args) } } | |
loop until done = threads.detect { |t| !t.alive? } | |
threads.each(&:kill) | |
done.value | |
end | |
end | |
puts [5, 3, 1, 2, 4].first_to_finish { |x| sleep x } |
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require "benchmark/ips" | |
require "bcrypt" | |
module Enumerable | |
def first_to_finish | |
threads = collect { |args| Thread.new { yield(args) } } | |
loop until done = threads.detect { |t| !t.alive? } | |
threads.each(&:kill) | |
done.value | |
end | |
def first_to_finish_with_queue | |
queue = Queue.new | |
threads = collect { |args| Thread.new { queue << yield(args) } } | |
result = queue.pop | |
threads.each(&:kill) | |
result | |
end | |
def get_first_result_async | |
result = nil | |
threads = map do |args| | |
Thread.new do | |
if current_result = yield(args) | |
result = current_result | |
(threads - [Thread.current]).each(&:kill) # kill siblings | |
end | |
end | |
end | |
threads.each(&:join) | |
result | |
end | |
end | |
COSTS = (10..15).to_a.reverse | |
def sferik | |
COSTS.first_to_finish { |cost| BCrypt::Password.create("secret", :cost => cost) } | |
end | |
def choonkeat | |
COSTS.first_to_finish_with_queue { |cost| BCrypt::Password.create("secret", :cost => cost) } | |
end | |
def juanito | |
COSTS.get_first_result_async { |cost| BCrypt::Password.create("secret", :cost => cost) } | |
end | |
Benchmark.ips do |x| | |
x.report("@sferik") { sferik } | |
x.report("@choonkeat") { choonkeat } | |
x.report("@JuanitoFatas") { juanito } | |
x.compare! | |
end |
awesome that was fun @sferik 👏 👏 👏
btw since we're killing threads, I suspect those lambda arguments need to be wrapped with Thread.handle_interrupt
(or are they unrelated?)
folding the lessons here into choonkeat/attache#27 thanks guys
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In case anyone is curious, here’s the functional reactive implementation I came up with:
I’m not an experienced RX programmer, so there’s a good chance I’m doing it completely wrong, but it was a fun exercise to try. Ultimately, I had to use the same
loop until
hack that I used in theEnumerable
example, which was disappointing, but maybe someone can suggest a more elegant solution.