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  18 <!-- This is a (PRE) block.  Make sure it's left aligned or your toc title will be off. -->
  19 <b>Benchmarks: Contents</b><br>&nbsp;&nbsp;<a href="#How Fast is Redis?">How Fast is Redis?</a><br>&nbsp;&nbsp;<a href="#Latency percentiles">Latency percentiles</a>
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  22                 <h1 class="wikiname">Benchmarks</h1>
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  29                     <h1><a name="How Fast is Redis?">How Fast is Redis?</a></h1>Redis includes the <code name="code" class="python">redis-benchmark</code> utility that simulates SETs/GETs done by N clients at the same time sending M total queries (it is similar to the Apache's <code name="code" class="python">ab</code> utility). Below you'll find the full output of the benchmark executed against a Linux box.<br/><br/><ul><li> The test was done with 50 simultaneous clients performing 100000 requests.</li><li> The value SET and GET is a 256 bytes string.</li><li> The Linux box is running <b>Linux 2.6</b>, it's <b>Xeon X3320 2.5Ghz</b>.</li><li> Text executed using the loopback interface (127.0.0.1).</li></ul>
  30 Results: <b>about 110000 SETs per second, about 81000 GETs per second.</b><h1><a name="Latency percentiles">Latency percentiles</a></h1><pre class="codeblock python" name="code">
  31 ./redis-benchmark -n 100000
  32
  33 ====== SET ======
  34   100007 requests completed in 0.88 seconds
  35   50 parallel clients
  36   3 bytes payload
  37   keep alive: 1
  38
  39 58.50% &lt;= 0 milliseconds
  40 99.17% &lt;= 1 milliseconds
  41 99.58% &lt;= 2 milliseconds
  42 99.85% &lt;= 3 milliseconds
  43 99.90% &lt;= 6 milliseconds
  44 100.00% &lt;= 9 milliseconds
  45 114293.71 requests per second
  46
  47 ====== GET ======
  48   100000 requests completed in 1.23 seconds
  49   50 parallel clients
  50   3 bytes payload
  51   keep alive: 1
  52
  53 43.12% &lt;= 0 milliseconds
  54 96.82% &lt;= 1 milliseconds
  55 98.62% &lt;= 2 milliseconds
  56 100.00% &lt;= 3 milliseconds
  57 81234.77 requests per second
  58
  59 ====== INCR ======
  60   100018 requests completed in 1.46 seconds
  61   50 parallel clients
  62   3 bytes payload
  63   keep alive: 1
  64
  65 32.32% &lt;= 0 milliseconds
  66 96.67% &lt;= 1 milliseconds
  67 99.14% &lt;= 2 milliseconds
  68 99.83% &lt;= 3 milliseconds
  69 99.88% &lt;= 4 milliseconds
  70 99.89% &lt;= 5 milliseconds
  71 99.96% &lt;= 9 milliseconds
  72 100.00% &lt;= 18 milliseconds
  73 68458.59 requests per second
  74
  75 ====== LPUSH ======
  76   100004 requests completed in 1.14 seconds
  77   50 parallel clients
  78   3 bytes payload
  79   keep alive: 1
  80
  81 62.27% &lt;= 0 milliseconds
  82 99.74% &lt;= 1 milliseconds
  83 99.85% &lt;= 2 milliseconds
  84 99.86% &lt;= 3 milliseconds
  85 99.89% &lt;= 5 milliseconds
  86 99.93% &lt;= 7 milliseconds
  87 99.96% &lt;= 9 milliseconds
  88 100.00% &lt;= 22 milliseconds
  89 100.00% &lt;= 208 milliseconds
  90 88109.25 requests per second
  91
  92 ====== LPOP ======
  93   100001 requests completed in 1.39 seconds
  94   50 parallel clients
  95   3 bytes payload
  96   keep alive: 1
  97
  98 54.83% &lt;= 0 milliseconds
  99 97.34% &lt;= 1 milliseconds
 100 99.95% &lt;= 2 milliseconds
 101 99.96% &lt;= 3 milliseconds
 102 99.96% &lt;= 4 milliseconds
 103 100.00% &lt;= 9 milliseconds
 104 100.00% &lt;= 208 milliseconds
 105 71994.96 requests per second
 106 </pre>Notes: changing the payload from 256 to 1024 or 4096 bytes does not change the numbers significantly (but reply packets are glued together up to 1024 bytes so GETs may be slower with big payloads). The same for the number of clients, from 50 to 256 clients I got the same numbers. With only 10 clients it starts to get a bit slower.<br/><br/>You can expect different results from different boxes. For example a low profile box like <b>Intel core duo T5500 clocked at 1.66Ghz running Linux 2.6</b> will output the following:
 107 <pre class="codeblock python python" name="code">
 108  ./redis-benchmark -q -n 100000
 109 SET: 53684.38 requests per second
 110 GET: 45497.73 requests per second
 111 INCR: 39370.47 requests per second
 112 LPUSH: 34803.41 requests per second
 113 LPOP: 37367.20 requests per second
 114 </pre>
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