Beefy Boxes and Bandwidth Generously Provided by pair Networks
good chemistry is complicated,
and a little bit messy -LW
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
What's going on may depend on the OS and filesystem, but creating an 81G file by printing out line by line is going to be a killer. You're going to be constantly extending it piece by piece, probably ending up with a badly fragmented file. And even with the disk likely being a RAID volume of some sort (As it's got to be at least a 170G volume there) you're going to find the reads and writes competing for the disk heads a lot.

This is as much, or more, a system administration issue as a perl one. Find your sysadmin, get him/her to fill you in on the characteristics of the system, and work with that. You may find that pre-extending the file is a good thing. There may be system parameters that can be set that govern the size of the new chunk your OS allocates when it extends a file. There may be cache settings that can be tweaked on the disk controller or individual files. This is obviously an adequately beefy machine, so you just need to do some performance tuning, and probably at the OS level.

Hopefully you're not accessing the file via NFS or some other networked file system. Those will tend to kill your performance dead.


In reply to Re: Performance Question by Elian
in thread Performance Question by Jarinn

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 wandering the Monastery: (5)
    As of 2020-03-31 03:15 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?
      To "Disagree to disagree" means to:









      Results (179 votes). Check out past polls.

      Notices?