To make it change, force perl to make more buckets by adding more items to the hash. 
>perl -le "for ('a'..'z') { $h{$_}=1; print scalar %h }
1/8
2/8
3/8
4/8
5/8
6/8
7/8
8/16
9/16
10/16
11/16
12/16
13/16
14/16
15/16
16/32
17/32
18/32
19/32
20/32
21/32
22/32
23/32
24/32
25/32
26/32

[download]
Note that sometimes, buckets will be reused: 
>perl -le "for ('a'..'z') { $h{$_ x 2}=1; print scalar %h }
1/8
2/8
3/8
4/8
5/8
6/8
7/8
8/16
9/16
10/16
11/16
12/16
13/16
14/16
15/16  <- before adding 'pp'
15/16  <- after  adding 'pp'
15/16
15/16
15/16
15/16
21/32
21/32
21/32
21/32
21/32
21/32

[download]
Note the duplicate '15/16's. 'pp' was added to an existing bucket because 'pp' hashed to the same value as another key.

In reply to Re: Effect of scalar function on hash by ikegami
in thread Effect of scalar function on hash by bowei_99

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!
  • 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, details, 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, summary, 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.