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From: soc <NP-f38@posteee.wheee>
Newsgroups: alt.fan.air
Subject: Re: techy question from an interested party!!!
Organization: Hardly
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Date: Tue, 19 Apr 2005 01:53:28 GMT
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In message <1113856839.6aed37ccc8336011986512071eb75719@teranews>,
"Pete_Zatoppin" <somewhere@warm.com> wrote:
>I am just interested......
>
>When a movie is posted in a split form, there are any number of
>combinations...
>
>Firstly, the JAS split size...I have seen any number of splits and I know
>you can set a split that suits.
>Then, there is the further splitting depending on how you post... again as
>an example TP is being posted with 684kb bits further split into 3.
Yes, the JAS split size can be anything you want, specified in either
bytes, kilobytes or megabytes. In this case, a split of 683KB was
used, or 700,000 bytes. It's kind of a strange size to use, but still
works fine.
Then you have the option of setting the number of lines in your
posting program. In this case, PowerPost was set to use somewhere
around 2000 lines, which caused each part to be further split into 3
sections. This is known as multipart posting.
>
>now, my question is "Is there an optimum split??" I see that the combined
>parts are never as big as the "gross size" of the combined parts.
>
>Example...TP the sum of the parts of each part is 709kb to give 684kb parts.
>I guess that the "loss" is something to do with encoding???
This is the encoding overhead, which makes it possible to post
binaries to a text-based system like Usenet. The encoding makes the
file size larger, depending on which method you use. UUE adds
somewhere around 30-40% overhead, while yEnc adds around 3%.
>
>
>From an entirely personal point of view......and in no way whatsoever
>criticizing the poster.... single parts of 684kb would be easier to cope
>with than the 3 way split of each part... but I assume there is a pay-off
>somewhere?
The purpose of multipart posting is mainly to ensure that your files
will be accepted by your news server, and propogate out to all the
other servers successfully. Some news servers accept larger files
than others. If you make the size too large, then you risk having
your posts either discarded along the way, or showing up incomplete.
With multiparts, each section is posted seperately one at a time, and
then joined together on the other end by whatever newsreader the
downloader is using. Most modern newsreaders will do this
automatically, and you won't even know it's happening. But if you're
stuck using an older reader, then it can be a real hassle.
The same thing can of course be accomplished by using a file splitter
like JAS, set to a smaller split size. Then there is really no need
to use multiparts at all. But everyone has their own way of doing
things.
>
>In some other groups a 10 or 12 mb split is favoured with up to 32 parts per
>split......but why???
>
>Is there a mathematical reason for splitting in particular ways or is it
>purely personal taste???
File size is the main reason, as I mentioned above. The way people
decide to do this is purely a matter of preference and the experience
of finding out what seems to work best. I've personally found that a
split size somewhere between 500KB and 650KB works very well for the
majority of news servers out there. Or alternatevely, setting your
posting program to 5000 lines or so. Then of course you could also
use a large split size like you mentioned, and combine this with
multipart posting as well. This can be useful if you're posting a
particularly large file, which would go over 999 parts at a smaller
split size. It doesn't really matter all that much , as long as your
files show up on the other end as they should. People using dial-up
or older newsreaders may prefer the first method, but it's up to the
poster to decide what works best for him or her in the end.
>
>TIA
>
>Hugz
>
>PeteX
>
HTH
soc NP-f38
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