Benchmark redis 2.8.19 with memcache 1.4.22

Having read a few articles on comparing redis with memcache. I decided to benchmark myself.

My setup:
Fedora 21,Nginx 1.6.2,redis 2.8.19,memcache 1.4.22,php-fpm 5.6.4.

My Benchmark script(php)

<?php
    ################# redis ###################################################
    $k=0;
    $t_time=0;
    echo "Benchmark redis : 
";
    $redis = new Redis();
    $redis->connect('127.0.0.1', 6379);
    
    $original_string = 'abcdefghijklmnopqrstuvwxyz';    
    for ($i=0;$i<=10000;$i++){
        $random_string = get_random_string($original_string, 10);
        $random_string2 = get_random_string($original_string, 10);
        $a1[$i]=$random_string;
        $a2[$random_string]=$random_string2;
    }    
    $tstart=timer_start();    
    for ($i=0;$i<=10000;$i++){
        $redis -> set($a1[$i],$a2[$a1[$i]]);        
    }
    $t_time=timer_end($tstart);    
    echo "Total Set time: ".$t_time."
";    
    for ($j=0;$j<10;$j++){
        $tstart=timer_start();        
        for ($i=0;$i<=10000;$i++){            
            $value=$redis -> get($a1[$i]);            
        }
    $t_time=timer_end($tstart);        
    echo "Loop $j (Get) time: ".$t_time."
";
    $k=$k+$t_time;    
    }     
    echo "Total 10 loop Get time $k 
";
    ################# memcache ###################################################
    $k=0;
    $t_time=0;
    echo "
Benchmark memcache : 
";
    $memcache = new Memcache;  
    $memcache->connect('127.0.0.1', 11211) or die ("Cannot connect");  

    $original_string = 'abcdefghijklmnopqrstuvwxyz';    
    for ($i=0;$i<=10000;$i++){
        $random_string = get_random_string($original_string, 10);
        $random_string2 = get_random_string($original_string, 10);
        $a1[$i]=$random_string;
        $a2[$random_string]=$random_string2;
    }    
    $tstart=timer_start();        
    for ($i=0;$i<=10000;$i++){        
        $memcache->set($a1[$i], $a2[$a1[$i]], false, 20) or die ("Cannot save data");
    }
    $t_time=timer_end($tstart);    
    echo "Total Set time: ".$t_time."
";        
    for ($j=0;$j<10;$j++){    
        $tstart=timer_start();    
        for ($i=0;$i<=10000;$i++){            
            $value = $memcache->get($a1[$i]);              
        }    
        $t_time=timer_end($tstart);
        echo "Loop $j (Get) time: ".$t_time."
";        
        $k=$k+$t_time;    
    } 
    echo "Total 10 loop Get time $k 
";   

function timer_start()   
{   $time = microtime();
    $time = explode(" ", $time);
    $time = $time[1] + $time[0];
    return $time;    
}   
function timer_end($start)
{   $time = microtime();
    $time = explode(" ", $time);
    $time = $time[1] + $time[0];    
    return $time-$start;    
}
   
function get_random_string($valid_chars, $length)
{       
    $random_string = "";    
    $num_valid_chars = strlen($valid_chars);    
    for ($i = 0; $i < $length; $i++)
    {        
        $random_pick = mt_rand(1, $num_valid_chars);
        $random_char = $valid_chars[$random_pick-1];
        $random_string .= $random_char;
    }
    return $random_string;
}   
?>

Benchmark redis : 
Total Set time: 0.12764096260071
Loop 0 (Get) time: 0.175616979599
Loop 1 (Get) time: 0.18264698982239
Loop 2 (Get) time: 0.13450312614441
Loop 3 (Get) time: 0.1352870464325
Loop 4 (Get) time: 0.13448214530945
Loop 5 (Get) time: 0.13312005996704
Loop 6 (Get) time: 0.15526604652405
Loop 7 (Get) time: 0.40630602836609
Loop 8 (Get) time: 0.13408994674683
Loop 9 (Get) time: 0.13564801216125
Total 10 loop Get time 1.726966381073 

Benchmark memcache : 
Total Set time: 0.14455795288086
Loop 0 (Get) time: 0.12623596191406
Loop 1 (Get) time: 0.13038897514343
Loop 2 (Get) time: 0.1564610004425
Loop 3 (Get) time: 0.11394095420837
Loop 4 (Get) time: 0.11402487754822
Loop 5 (Get) time: 0.11300802230835
Loop 6 (Get) time: 0.11119389533997
Loop 7 (Get) time: 0.1115710735321
Loop 8 (Get) time: 0.11155104637146
Loop 9 (Get) time: 0.19941091537476
Total 10 loop Get time 1.28778672218322

The results shows for simple Set and Get, redis is faster. For SET, redis is faster by 12% For GET, memcache is faster by 25%

For other functions,more extensive tests/benchmarks have to perform on both.