In this case, "data" is a bunch of integers. In moving from a hash to an array, the "keys" do have to be integers. I you're just counting, nothing else matters, but if it is about key-value pairs, that move is still valid if just the key is a (positive) integer. The value(s) in that pair do not have to be.
Another thing not yet mentioned is that with datasets this large, not only the data itself may put a limit on the internal available memory footprint, but the overhead in perl structures add to that. Just today I checked what the internal representation of a 1 Mb .csv file was represented as an array(ref) of array(ref)s: it grew to 10Mb! A hash takes slightly more overhead than an array (most overhead goes into converting a single number into a refcounted SV), so when on the verge of swapping, an array might actually be much faster than a hash.
Enjoy, Have FUN! H.Merijn
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:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- 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
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||