Daniel Stenberg wrote:

>On Tue, 25 Nov 2003, Stefan Sassenberg wrote:
>
>
>>Now there's one big problem left which is the data transfer itself. The
>>transfer of a file (70kByte) using the windows command line tool 'ftp' takes
>>about 80-90ms. With libcurl it takes about 450ms. The network analyzer tells
>>me that there are gaps between the packets from time to time with a size of
>>about 80ms. Can you help me finding the reason for this? My sending method
>>and the callback function are listed below.
>>
>>
>
>This is not a problem with your provided code, as you shouldn't be able to
>slow down libcurl that much. It seems like a libcurl performance problem. Is
>this libcurl 7.10.8?
>
>To find the culprit of this, you need patience and profiling tools that can
>figure out where the time is spent.
>
>Not very long ago, a friend of mine ran some profiling tools on libcurl, only
>to find that it was very effective and spent very little extra time beside
>what the download itself actually took. That test was not done on Windows
>though.
>
>
It was 7.10.7 but I upgraded to 7.10.8 a few minutes ago with the same
results. What a pity. Transmission speed is a very important factor in
my project, and now I can hardly send 150kBytes/second. I hope I have
enough time for profiling the lib.

Stefan

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Received on 2003-11-26