Comments (4)
What is the advantage of doing so?
The disadvantage is it likely causes extra resource consumption (CPU & memory).
from concurrent-ruby.
The advantage is that you get slightly improved latency on handling the first few items that are posted to the pool. On my system, I see about a 0.5ms improvement to handling the first few items when using prestart.
from concurrent-ruby.
I see. Could you share a repro for that? I'd like to try it locally.
from concurrent-ruby.
Here's how I'm trying to measure the impact:
require "concurrent"
def gettime
Process.clock_gettime(Process::CLOCK_MONOTONIC)
end
def measure_latency(prestart)
pool = Concurrent::FixedThreadPool.new(1, prestart: prestart)
times = []
start = gettime
pool.post { times << (gettime - start) }
pool.shutdown
pool.wait_for_termination
times.first
end
def percentiles(times, p)
times.sort!
times[(times.size * p).ceil - 1]
end
n = 1000
no_prestart_times = n.times.map { measure_latency(false) }
prestart_times = n.times.map { measure_latency(true) }
puts "No prestart:"
puts " 50th percentile: #{percentiles(no_prestart_times, 0.5)}"
puts " 90th percentile: #{percentiles(no_prestart_times, 0.9)}"
puts " 99th percentile: #{percentiles(no_prestart_times, 0.99)}"
puts "Prestart:"
puts " 50th percentile: #{percentiles(prestart_times, 0.5)}"
puts " 90th percentile: #{percentiles(prestart_times, 0.9)}"
puts " 99th percentile: #{percentiles(prestart_times, 0.99)}"
puts "Delta:"
puts " 50th percentile: #{percentiles(no_prestart_times, 0.5) - percentiles(prestart_times, 0.5)}"
puts " 90th percentile: #{percentiles(no_prestart_times, 0.9) - percentiles(prestart_times, 0.9)}"
puts " 99th percentile: #{percentiles(no_prestart_times, 0.99) - percentiles(prestart_times, 0.99)}"
from concurrent-ruby.
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from concurrent-ruby.