title: What is the LD_PRELOAD trick?
body: <p>I came across a reference to it recently on <a href="http://www.reddit.com/r/programming/comments/7o8d9/tcmalloca_faster_malloc_than_glibcs_open_sourced/c06wjka" rel="noreferrer">proggit</a> and (as of now) it is not explained.</p>
  
  <p>I suspect <a href="https://stackoverflow.com/questions/335108/hide-symbols-in-shared-object-from-ld#335253">this</a> might be it, but I don't know for sure.</p>