redis_del_vs_srem_benchmarks.rb

#!/usr/bin/env ruby -w
require 'redis'
require 'benchmark'

HOST = 'localhost'
PORT = 6379
SETNAME = 'benchmark_testing_set'
SETSIZE = 3000

def prep(array=[])
  redis = Redis.new(:host => HOST, :port => PORT, :thread_safe => true)
  redis.del(SETNAME)
  0.upto(SETSIZE) do |i|
    array << i
    redis.sadd(SETNAME, i)
  end
  redis
end

def del
  redis = prep
  redis.del(SETNAME)
end

def srems
  ids = []
  redis = prep(ids)
  pipeline = Redis::Pipeline.new(Redis.new(:host => HOST, :port => PORT, :thread_safe => true))
  ids.each do |id|
    pipeline.srem(SETNAME, id)
  end
  pipeline.execute
end

Benchmark.bmbm do |x|
  x.report('delete the set') { del }
  x.report('srem the set members') { srems }
end