Re: [UDT] UDT Resource Usage

[Yunhong Gu <yu...@la...>]

Hi, Ben,

As you know that UDT was designed for high speed networks, the default 
protocol buffer size (40MB) is much larger than the common system socket 
settings. You can use "UDT::setsockopt" to modify the protocol buffer 
size.

E.g.,
UDT::setsockopt(client, 0, UDP_RCVBUF, new int(1000000), sizeof(int));

When NO_BUSY_WAITING is enabled, UDT should not use much CPU time, so that 
was strange. Are you using version 2.2 or 2.1? If you are using 2.1, can 
you give a try of 2.2? I just tested it on my Windows XP machine, and it 
costed about 2% CPU when sending data at 100Mb/s.

Thanks,
Gu

Yunhong Gu, Research Scientist

National Center for Data Mining
University of Illinois at Chicago
SEO 700, M/C 249, 851 S Morgan St
Chicago, IL 60607-7045
T (312) 413-9576
F (312) 355-0373

On Tue, 17 Jan 2006, Ben Page wrote:

> Hello,
>
> I am currently evaluating the use of UDT for a new internet-based application 
> I am working on. I have had good success integrating your library with my 
> code but have noticed that when running the new version of my application 
> with UDT the CPU usage jumps to near 100% and the memory usage is also 
> greatly increased.
>
> While I understand that UDT is designed for high-bandwidth wide-area
> networks and mine is an Internet-based application I would be interested
> in any insight you might have into the highly resource-intensive
> performance I have noticed.
>
> I am currently building UDT using the Visual Studio solution file
> available with the latest release ( in which the NO_BUSY_WAIT flag is
> set). I am using a statically-linked version of the library but apart
> from that have made no changes to the build settings.
>
> The problem is more obvious when sending data than receiving. I'd be
> really grateful if you could provide any insight into what I could be
> doing wrong or where I should look while trying to fix the problem.
>
> Very Best Regards,
>
> Ben Page
>
>
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