Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Thank you for your answer.
Seems I found original discussion
and it seems that was just optimization of previous algorithm overhead:
Perl currently has a defense against attacks on its hash algorithm where it conditionally enables the use of a random hash seed when it calculates the hash value for a string. This mode is triggered by encountering an overly long bucket chain during insert. Once this bit is set all further hash operations have to go through additional layers of logic. All of this support has a per-operation cost.
The rehash mechanism more or less works around the problem of hash order expectations by only enabling the randomization in degenerate hashes. But it achieves this at the cost of added per operation overhead in hot code paths and additional complexity in the code.

In reply to Re^6: Truly randomized keys() in perl 5.17 - a challenge for testing? by vsespb
in thread Truly randomized keys() in perl 5.17 - a challenge for testing? by saintmike

Title:
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!
  • 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
  • Outside of code tags, you may need to use entities for some characters:
            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?
    Username:
    Password:

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

    How do I use this? | Other CB clients
    Other Users?
    Others musing on the Monastery: (8)
    As of 2014-09-16 10:48 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      How do you remember the number of days in each month?











      Results (9 votes), past polls