[darcs-devel] announcing darcs 2.0.0pre1, the first prerelease for darcs 2

Dmitry Kurochkin dmitry.kurochkin at gmail.com
Tue Dec 18 01:27:41 UTC 2007

After looking at this a bit more it does not look so good to me.

I thought that darcs uses a new TCP connection for each patch. But
wireshark shows that it uses persistent connection already.
So there is no TCP handshake overhead.

Pipelining is sending multiple requests without waiting for response.
This would give some benefit but I am not sure it worth the price of
moving to cURL multi interface.

I think I will write a script which grabs darcs repo using cURL with
just persistent connection and with pipelining. And depending on
results we can decide what to do.


David Roundy wrote:
> Hmmmm.  Alas, curl 7.16 is not yet in debian stable (my default for when we
> can require something), but that's still very interesting!  Do you by any
> chance have experience coding with libcurl? We've only ever used the "easy"
> interface, and if you'd like to take a shot at updating src/hscurl.c to use
> the "multi" interface, that would be great!
> (We'd need to have a configure check so we'd work with older libcurl
> versions, but I could handle that if you'd rather not.)
> David
> On Tue, Dec 18, 2007 at 01:06:26AM +0300, Dmitry Kurochkin wrote:
>> Hi David,
>> According to cURL changelog pipeline support has been added in version 
>> 7.16.0:
>> CURLMOPT_PIPELINING added for enabling HTTP pipelined transfers.
>> I did not use it myself but from the docs it looks like this is just 
>> what you want. Quote:
>> Pass a long set to 1 to enable or 0 to disable. Enabling pipelining on a 
>> multi handle will make it attempt to perform HTTP Pipelining as far as 
>> possible for transfers using this handle. This means that if you add a 
>> second request that can use an already existing connection, the second 
>> request will be "piped" on the same connection rather than being 
>> executed in parallell. (Added in 7.16.0)
>> Thanks for your work on darcs (and xmonad :))!
>> Regards,
>>  Dmitry
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