gistfile1.rb

def bench(descr)
    start = Time.now
    yield
    puts "#{descr} #{Time.now-start} seconds"
end

def without_pipelining(u)
    r = Redis.new
    10000.times {
        r.sadd(u.deleted_fls.key, 43)
    }
end

def with_pipelining(u)
    r = Redis.new
    r.pipelined {
        10000.times {
            r.sadd(u.deleted_fls.key, 43)
        }
    }
end

bench("without pipelining") {
    without_pipelining(u)
}
bench("with pipelining") {
    with_pipelining(u)
}

without pipelining 1.500497 seconds 
with pipelining 0.402737 seconds