title: Is the UNIX `time` command accurate enough for benchmarks?
body: <p>Let's say I wanted to benchmark two programs: foo.py and bar.py.</p>
  
  <p>Are a couple thousand runs and the respective averages of <code>time python foo.py</code> and <code>time python bar.py</code> adequate enough for profiling and comparing their speed?
  <br/><br /><br />
  <b>Edit:</b> Additionally, if the execution of each program was sub-second (assume it wasn't for the above), would <code>time</code> still be okay to use?</p>