[Unison-hackers] Asymmetric DSL and large files

[Stefan Goldmann]

Hi Benjamin.

<quote>

Unison has to propagate the  
changes in your file *from* the machine that has the new version *to*  
the machine that doesn't, no?

</quote>

Yes, exactly. And the *from* machine is the distant work computer, and 
the *to*
machine is the local home computer. Unison detects, that the work computer's
version has changed, so the changes should be propagated from
work to home, using the 350kb/s bandwidth. Instead, somehow Unison starts
"eating up" all of the 50kb/s bandwidth from home to work. Why?? That's the
wrong direction.

I hope this clarifies things. :-)

How does Unison determine what parts of a file have changed?
I guess that this is the problem's root.

Best wishes,
Stefan


Benjamin Pierce wrote:
> Hi Stefan,
>
> I'm afraid I didn't really understand your question the first time,  
> and I don't really understand it now.  Unison has to propagate the  
> changes in your file *from* the machine that has the new version *to*  
> the machine that doesn't, no?  (If all you want is to make the two  
> versions the same, then you can tell Unison manually to overwrite the  
> new version with the old one, and then you'll be utilizing the network  
> in the fast direction.  But usually that's not what's wanted.)
>
> Best,
>
>      - Benjamin
>
>
>
> On Jan 17, 2009, at 8:41 AM, Stefan Goldmann wrote:
>
>   
>> Hello everyone,
>>
>> I've asked this question at the users list already, but we couldn't  
>> find
>> an answer, so here it goes again.
>>
>> I have a large file, about 200MB, which I want to sync between home  
>> and
>> work computer. My internet at home is ADSL, 50kbyte/s upload and
>> 350kbyte/s download, my internet at work is 100MBit/s in both  
>> directions.
>>
>> When I trigger syncing these files from my home computer,  and the  
>> file
>> has been changed on the work computer, then the following happens:
>> Unison states "Propagating changes" and thats it. Nothing more happens
>> for a couple of minutes, and after that I aborted the process. I  
>> didn't
>> even get the percentage display for the progress.
>>
>> A look into the network monitor revealed, that for the "Propagating
>> changes" stage, Unison used the complete upload bandwidth of 50kbyte/ 
>> s,
>> whereas the larger download direction wasn't utilized at all.
>>
>> Is this how it is supposed to be? Am I getting something wrong? In my
>> eyes it should be no problem to determine the parts that have been
>> changed the other way round.
>>
>> I hope my problem's explanation is somehow clear enough. Have a nice
>> weekend,
>> Stefan
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>
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