[Qt-interest] wget vs. QHttp download

[amulya rattan]

Hi Thiago,

Thanks for the reply. The code that is using QHttp was written somewhere
around March 2009 when this class wasn't obsolete. But I agree, I should now
use QNetworkAccessManager. However, has there been any changes to
QNetworkAccessManager that makes it download faster? I suspect not. Also,
what advantages would I get if I use the new class? Is it just a better
designed interface or more than that? I ask all this since I have a lot of
code using QHttp and I need to know how much better off I'd be using the new
class.

About the measurements, all I did was start timer before download and end
timer when the download was done. This has become a strange problem since
download theoretically/practically should only depend upon the network
speed, but the vast difference in response from wget and QHttp is just
appalling.

I'd again like to mention that its a simple download from one of our
servers, that I am trying to do. Nothing fancy.

~Amulya

On Fri, Nov 5, 2010 at 4:23 AM, Thiago Macieira <thiago at kde.org> wrote:

> On Thursday, 4 de November de 2010 11:08:58 amulya rattan wrote:
> > Guys,
> >
> > Recently I have been trying to calculate the download speed for our
> > network, so basically what I did was just use QHttp to download a file on
> > the server and calculate the time it took to figure out the network
> speed.
> > However, the speed estimates I got were rather off the track, which led
> me
> > to try out wget. With wget, the speed estimates are pretty much on the
> > spot. Does anyone know why such a difference exists? I understand that
> the
> > network speed can go up and down and it could be what is happening in
> this
> > case BUT I have tried this thing literally hundreds of times now and
> > everytime its wget that gives a proper estimate. QHttp download for some
> > reason is always "slower".
>
> Hi Amulya
>
> First of all, please stop using QHttp. Use QNetworkAccessManager like the
> documentation asks you to.
>
> Second, we need a better explanation to understand what you mean. I can
> reach
> 11-12 MB/s downloads on our office network using QNAM (100 MBit/s
> full-duplex).
> That's the limit of the network.
>
> Also note that the problem might be the measurement you made.
>
> --
> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
>  Senior Product Manager - Nokia, Qt Development Frameworks
>      PGP/GPG: 0x6EF45358; fingerprint:
>      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
>
> _______________________________________________
> Qt-interest mailing list
> Qt-interest at trolltech.com
> http://lists.trolltech.com/mailman/listinfo/qt-interest
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.qt-project.org/pipermail/qt-interest-old/attachments/20101105/9104269c/attachment.html