title: Out of memory errors when executing Jest on Ubuntu
body: <p>I'm trying to execute Jest on Ubuntu 14.04.02, in a virtual machine with 4gb of RAM.  node version 0.12.2, npm 2.0.0-alpha-5</p>
  
  <p>free shows me:</p>
  
  <pre><code>              total       used       free     shared    buffers     cached
  Mem:          3.8G       199M       3.6G       976K       1.1M        18M
  </code></pre>
  
  <p>When I run npm test, I keep getting a variety of out of memory errors:</p>
  
  <pre><code>Error: FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - process out of memory
  
  FATAL ERROR: Committing semi space failed. Allocation failed - process out of memory
  
  # Fatal error in ../deps/v8/src/heap/store-buffer.cc, line 132
  # CHECK(old_virtual_memory_-&gt;Commit(reinterpret_cast&lt;void*&gt;(old_limit_), grow * kPointerSize, false)) failed
  </code></pre>
  
  <p>Any idea what the minimum memory requirement is...or if I have misconfiguration something that is leading to this?</p>