title: How to use and set appropriately concurrency level for ConcurrentHashMap?
body: <p>I am working with around 1000 elements in concurrenthashmap . Default concurrency level is 16 . can anyone help me with some algorithm or factors from which i can identify the concurrency level  suitable for my scenario or in what way a concurrency level affects the processing of multiple threads .</p>
  
  <pre><code>   ConcurrentHashMap&lt;String, String&gt; map=new ConcurrentHashMap&lt;String, String&gt;(500,1,20);             
  </code></pre>
  
  <p>20 is my concurrency level (dummy value) .Need to set this efficiently</p>