Beefy Boxes and Bandwidth Generously Provided by pair Networks
Syntactic Confectionery Delight
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Read the note at the bottom

I'm impressed again. I was just installing BerkeleyDB according to tilly's suggestion. That was a real nice one, as well. I like using existing modules, as opposed to some others@pm. However, your code seems to be exactly what I wanted.

Well, the size of the string $sorton shouldn't be much of a problem, it only uses (in my case) 2*13M = 26M of memory. Small offer, here.

I did a check whether my local 'sort' (qsort, apparently) messed with the order of equal keys:

#!/usr/bin/perl @data=qw(bb bbZZ aaZZ aaSD aaPM aaAA aa); print join " ", sort { substr($a,0,2) cmp substr($b,0,2) } @data; #Result: aaZZ aaSD aaPM aaAA aa bb bbZZ
So, it doesn't. I'm very happy with that. This, because the remainder of the string is some code for the time, stored in something like 100us accuray, with a max of 2-3 days. You don't want to sort on that, but you also don't want to change the order. I hope this explains my reluctancy to mix it up.

I guess the key notion here is the collection of my keys in a string, saving the array-overhead.

Thanks a lot,

Jeroen
"We are not alone"(FZ)

Update I'm afraid I was too fast with my happiness. The real memory hog lies in the 0..($idx-1). That gives you 13M item array, that won't fit in memory. Too bad.


In reply to Re: (tye)Re: Sorting data that don't fit in memory by jeroenes
in thread Sorting data that don't fit in memory by jeroenes

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, 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?
    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 perusing the Monastery: (4)
    As of 2020-11-25 17:15 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      No recent polls found

      Notices?