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Re: Limiting bandwidth

by jarich (Curate)
on Oct 26, 2004 at 12:26 UTC ( #402546=note: print w/replies, xml ) Need Help??

in reply to Limiting bandwidth

What kind of file is it? For example is it a log file for some program? Is it a file that gets changed often or do you download it every day just in case it was changed yesterday? Do you need all the date contained in it?

With answers to these questions we might be able to help reduce the times you need to download it at all, and that might make your benefactors very happy.

A few scenarios come to mind:

  1. It's a file which only changes once every 2 days or less often
  2. It's a log file or similar and you only care about the last X many lines, where X is much smaller than the total number of lines
  3. It's a file which changes all the time and you care about all of it

Let's consider these options:

It's a file which only changes rarely

Run a hashing algorithm over the file (eg md5sum) and download the result. If the hash is the same as the previous day then don't download it.

A disadvantage with this is you may need to ask their sysadmin to assist you somewhat, by giving you sufficent access to run this command, or by agreeing to run a scheduled task every night which creates the hash for you.

It's a log file

Rotate the file more often (daily), so that you only need to download the bits you care about.

It's a file which changes all the time

This is the hard one. All you can do here is:

  • Make sure you compress the file
  • Shape your traffic
  • Hope they'll still like you.
  • Consider whether you can download it every two days late at night, instead of daily, so as to minimise the disruption caused.

Of course, if it is one of the first two, then so long as you compress you file as well; one of those methods should help a lot.

Hope this helps.


Replies are listed 'Best First'.
Re^2: Limiting bandwidth
by sgifford (Prior) on Oct 27, 2004 at 06:05 UTC
    Hi jarich, It's a ZIP file full of images that changes every day. So unfortunately none of these ideas will help with my particular situation, but they're definitely good things to keep in mind!

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