Benchmarking redis sinit command

bench_sinit.rb

require 'redis'
require 'benchmark'

$redis = Redis.new
#$redis.flushall

array_size = Integer(ARGV.first)
a = Array.new(array_size) { rand(1_000_000) }
a = a.uniq

puts "Array size #{a.size}"

Benchmark.bm(100) do |x|
  x.report('simple sadd') {
    $redis.del 'set1'

    a.each { |l|
      $redis.sadd 'set1', l
    }
  }

  x.report('sadd pipelined') {
    $redis.del 'set2'
    $redis.pipelined do
      a.each { |l|  $redis.sadd 'set2', l }
    end
  }

  x.report('sadd pipelined (force hash table)') {
    $redis.del 'set4'
    $redis.pipelined do
      $redis.sadd 'set4', 'ht'
      a.each { |l|  $redis.sadd 'set4', l }
      $redis.srem 'set4', 'ht'
    end
  }

  x.report('sinit') {
    $redis.sinit 'set3', *a
  }

  x.report("ping pipelined") {
    $redis.pipelined do
      a.size.times {  $redis.ping  }
    end
  }
end

# Output:
#
# Array size 9942
#                                        user     system      total        real
# simple sadd                         0.370000   0.150000   0.520000 (  0.704810)
# sadd pipelined                      0.140000   0.000000   0.140000 (  0.168001)
# sadd pipelined (force hash table)   0.120000   0.010000   0.130000 (  0.154536)
# sinit                               0.020000   0.000000   0.020000 (  0.037388)
# ping pipelined                      0.100000   0.000000   0.100000 (  0.092546)