del_benchmark.rb

require 'benchmark'
require 'redis'

class Redis
  def del(*keys)
    synchronize do |client|
      client.call([:del] + keys)
    end
  end

  def del_with_check(*keys)
    return 0 if keys == [[]]

    synchronize do |client|
      client.call([:del] + keys)
    end
  end

  def del_with_rescue(*keys)
    synchronize do |client|
      client.call([:del] + keys)
    end
  rescue Redis::CommandError
    return 0 if keys == [[]]

    raise
  end
end


COUNT = (ENV['COUNT'] || 100_000).to_i
RUNS = (ENV['RUNS'] || 5).to_i

def client
  @client ||= Redis.new(db: 15)
end

def keys
  @keys ||= COUNT.times.map { |n| "key#{n}" }
end

def prepare
  client.flushdb

  client.pipelined do
    keys.each do |key|
      client.set key, key
    end
  end

  GC.start
end

Benchmark.bm 15 do |x|
  RUNS.times do
    prepare

    x.report("del") do
      keys.each { |key| client.del(key) }
    end

    prepare

    x.report("del_with_check") do
      keys.each { |key| client.del_with_check(key) }
    end

    prepare

    x.report("del_with_rescue")  do
      keys.each { |key| client.del_with_rescue(key) }
    end
  end
end