Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
(no, haven't done any profiling)
Well, there's your problem right there.

If a fronting hash would make a difference, you're talking about something that's pretty far into the realm of micro-optimizations. And you should never bother with micro-optimizations unless you've profiled first to see that there's a benefit to be gained by micro-optimizing.

In this particular case, my intuition is that the cost of doing the preliminary hash lookup will be slower than walking the linked list in the bucket where a collision happened anyhow, so, if your idea had any noticeable effect, I suspect it would probably be to make things slower (and more memory-intensive) rather than faster.

But, again, profile before spending any more time contemplating it. 100,000 hash lookups probably take less time than you'll spend reading this sentence, even if they are lookups into a 3GB hash. Even if you could magically optimize that down to zero time, it won't noticeably impact the overall program's performance.

In reply to Re: Small Hash a Gateway to Large Hash? by dsheroh
in thread Small Hash a Gateway to Large Hash? by lsherwood

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others exploiting the Monastery: (5)
    As of 2018-10-17 01:17 GMT
    Find Nodes?
      Voting Booth?
      When I need money for a bigger acquisition, I usually ...

      Results (90 votes). Check out past polls.