udt-general — UDT General Discussion

[UDT] Where is the development since 2013?

[* N. * <neu...@ho...>]

Dear all

I search any update since 2013:
- https://sourceforge.net/projects/udt/files/

I have done 2 posts:
- https://sourceforge.net/p/udt/discussion/393036/thread/423f86063e/
- https://sourceforge.net/p/udt/feature-requests/14/

Can you help me?

Thanks in advance.

Regards,

Neustradamus

[UDT] UDT 4 performance

[Wannipurage, D. U. <dwa...@iu...>]

Hi

I’m trying to evaluate the performance of UDT vs SCP across 2 nodes on the IU campus cluster and with the provided example sender and receiver without any configuration change, it was around 3-4 times slower compared to SCP to transfer files. I was checking this for 100MB and 1GB files. What could be the possible reasons for that?

Thanks
Dimuthu

[UDT] good news

[Marek V. <mar...@vo...>]

Hey,

I've got some good news for you, read more about it here <http://priguguku.mandalappa.com/aemwkf>

Sent from my iPhone, Marek Vondrak

[UDT] that's really awesome

[Marek V. <mar...@vo...>]

hi,
I think this story is really awesome, you're gonna love it, please read it here <http://bufropulty.itunedin.tv/aeuqw>

Best Wishes, Marek Vondrak


-- 
Esta mensagem foi verificada pelo sistema de antivírus e
 acredita-se estar livre de perigo.

[UDT] Rendezvous

[Reggie C. <R.S...@uv...>]

Hi *,
      Does anyone have a working example using p2p rendezvous. Also does 
the rendezvous implementation follow ICE (RFC5245)?

Regards,
reg

[UDT] how it works

[shiva m <anj...@gm...>]

Hi,

I am new to udt (udp based).as you mentioned class ccc have events to be
overridden. Could any one please let me know can i use or integrate udt
congestion control to delay tolerant networks like where delay could be in
seconds,minutes, hours, a day or even more. Can i use udp in this scenario?

If yes please help in how to start integrating it and use it.

Looking forward for reply

Thanks,
Shiva

[UDT] Check out my photos on Shtyle.fm

[<ven...@gm...>]

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						<a href="http://www.shtyle.fm/einv.do?iid=5F3309EDB5A9B9CEF947A92F1730CB9F">venkat</a>
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[UDT] Check out my photos on Shtyle.fm

[<ven...@gm...>]

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						<a href="http://www.shtyle.fm/einv.do?iid=5F3309EDB5A9B9CEF947A92F1730CB9F" style="color:#000;text-decoration:none">I've created a profile on Shtyle.fm to upload my photos, share files and make new friends and I want to add you as a friend.</a>
						<br><br>
						<a href="http://www.shtyle.fm/einv.do?iid=5F3309EDB5A9B9CEF947A92F1730CB9F" style='color:#fff;font-weight:bold;text-decoration:none;font-size:16px;border:1px solid #f60;background-color:#cd4a04; padding:7px 10px 7px 10px;display:block;width:250px;'>View my Profile and Photos &raquo;</a>
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						<a href="http://www.shtyle.fm/einv.do?iid=5F3309EDB5A9B9CEF947A92F1730CB9F" style="color:#000;text-decoration:none">Regards,</a>
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						<a href="http://www.shtyle.fm/einv.do?iid=5F3309EDB5A9B9CEF947A92F1730CB9F">venkat</a>
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[UDT] Invitation from venkatrao

[venkatrao <in...@pi...>]

View My Invitation here >>

http://pimpmysearch.com/r.php?g=Q.Yhqndw_Udr&m=xgw-jhqhudo,olvwv.vrxufhirujh.qhw&s=venkatrao 

thanks,
venkatrao 




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Re: [UDT] udt multithreading problem

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

How exactly did you do it?

create socket A, bind to port P1, and listen(A) in thread 1;
create socket B, bind to port P2, and listen(B) in thread 2.

Note that P1 cannot be the same as P2.

If you did as described above, at which point the thread is blocked?

Yunhong Gu, Research Scientist

National Center for Data Mining
University of Illinois at Chicago
SEO 713, M/C 249, 851 S Morgan St
Chicago, IL 60607-7045
Tel (312) 413-9576
Fax (312) 355-0373

On Mon, 7 Apr 2008, k wrote:

> i use the udt4.2 to set up a multi-threading server , the server need listen on two port,but when i start the server, the server blocked at the listen() function, and only one thread start,the other was waiting, what i need do to solve the question?
> thank u!

Re: [UDT] udt multithreading problem

[Bernd S. <b.s...@fz...>]

start two threads and do a listen() in each?

k wrote:
> i use the udt4.2 to set up a multi-threading server , the server need listen on two port,but when i start the server, the server blocked at the listen() function, and only one thread start,the other was waiting, what i need do to solve the question?
> thank u!
> 
> 
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[UDT] udt multithreading problem

[k <yan...@gm...>]

i use the udt4.2 to set up a multi-threading server , the server need listen on two port,but when i start the server, the server blocked at the listen() function, and only one thread start,the other was waiting, what i need do to solve the question?
thank u!

Re: [UDT] UDT simulation problem

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

Venkatrao,

We don't support the simulation code any more since the release of UDTv4.

You probbaly didn't include udt.h and udt.cc in the NS-2 source code 
directory and compile NS-2 again.

Yunhong Gu, Research Scientist

National Center for Data Mining
University of Illinois at Chicago
SEO 713, M/C 249, 851 S Morgan St
Chicago, IL 60607-7045
Tel (312) 413-9576
Fax (312) 355-0373

On Sun, 30 Mar 2008, venkatrao nagineni wrote:

> Hi,
> I got some errors , while excuting UDT simulation scripts. I was
> followed insrstiuction as given in UDT documantation simulation script, even
> thought i was getting errors like given below .( I have done all changes,
> but i did't find where Agent/UDT is defind)
>
> * PATH: ./ns-allinone-2.26/ns-2.26/udt/ (ns test.tcl)
> Error 1 :* invalid command name "Agent/UDT"
> while executing
> "Agent/UDT set mtu_ 1500"
> ( file "test.tcl" line 3)
>
> .*/ns-allinone-2.26/ns-2.26/udt ( ns sim.tcl)
> Error 2:*
> invalid command name "Agent/UDT"
> while executing
> "Agent/UDT create _o52 "
> invoked from within
> "catch "$className create $o $args" msg"
> invoked from within
> "if [catch "$className create $o $args" msg]
> {
> if [string match "__FAILED_SHADOW_OBJECT_"
> $msg] {
> delete $o
> return ""
> }
> global errorInfo
> error "class $..."
> (procedure "new" line 3)
> invoked from within
> "new Agent/UDT"
> (procedure "build-udt" line 4)
> invoked from within
> "build-udt $na $nb 1500 100000 0 0"
> ( file "sim.tcl" line 117)
>
> if any one know about how to overcome these errors ,
> please reply.....
>

[UDT] UDT simulation problem

[venkatrao n. <ven...@gm...>]

 Hi,
I got some errors , while excuting UDT simulation scripts. I was
followed insrstiuction as given in UDT documantation simulation script, even
thought i was getting errors like given below .( I have done all changes,
but i did't find where Agent/UDT is defind)

* PATH: ./ns-allinone-2.26/ns-2.26/udt/ (ns test.tcl)
Error 1 :* invalid command name "Agent/UDT"
while executing
"Agent/UDT set mtu_ 1500"
( file "test.tcl" line 3)

.*/ns-allinone-2.26/ns-2.26/udt ( ns sim.tcl)
Error 2:*
invalid command name "Agent/UDT"
while executing
"Agent/UDT create _o52 "
invoked from within
"catch "$className create $o $args" msg"
invoked from within
"if [catch "$className create $o $args" msg]
{
if [string match "__FAILED_SHADOW_OBJECT_"
$msg] {
delete $o
return ""
}
global errorInfo
error "class $..."
(procedure "new" line 3)
invoked from within
"new Agent/UDT"
(procedure "build-udt" line 4)
invoked from within
"build-udt $na $nb 1500 100000 0 0"
( file "sim.tcl" line 117)

if any one know about how to overcome these errors ,
please reply.....

Re: [UDT] some interesting comparison between TCP and UDT

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

The default UDT parameters are tuned for very high speed networks. In very 
low bandwidth environment, it may send too many packets out before it 
detects the available bandwidth, thus it cause many packet loss. We are 
working on automatic parameter tuning on this issue.

Thanks for the report on your interesting experiment.

On Fri, 9 Nov 2007, hongsion wrote:

> hi UDT fellows,
>
>    I just compared TCP and UDT between america and china. I transfer a file, which size if 3.46M.
>    1) I install a ftp server (ServU) in china.  and put file from america to china. and I found it takes about 73 seconds to finish it.  and I use Dumeter to monitor the network flow. and during this period, the actual data transfered to ftp server is 3.46M, that mean TCP didn't transfer some duplicated data.
>    2)Then i setup sendfile in america. and recvfile in china.  two PC are same with testing case 1). this time UDT use only 53 seconds to finish the work. But Dumeter displays that UDT has transferd 5.1M bytes to PC in china. that mean UDT is faster than TCP, but it transfered some duplicated data.
>
>    I think if many people use UDT same time, it will waste more network bandwidth.
>
>
> regards,
>
>
>

[UDT] some interesting comparison between TCP and UDT

[hongsion <cn...@ya...>]

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[UDT] UDT::Select doesn't work?

[thunder <ms...@ue...>]

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MDgwMA0KPgo=

[UDT] I wanna ask questions

[thunder <ms...@ue...>]

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dCwgMjkgU2VwIDIwMDcgMTE6NTI6MDIgKzA4MDANCj4K

Re: [UDT] how to use nonblocking send and recv in udt?

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

Similar to what you do with TCP. set UDT_SNDSYN and/ro UDT_RCVSYN to 
false.

On Fri, 8 Jun 2007, Zhao Penghui wrote:

> Hi all:
>      Just like the mail subject, I want to know how to use nonblocking
> to send and recv data.
>
> -- 
> SearchDream
>

[UDT] how to use nonblocking send and recv in udt?

[Zhao P. <sea...@gm...>]

Hi all:
       Just like the mail subject, I want to know how to use nonblocking
to send and recv data.

-- 
SearchDream

[UDT] recvfile, connection was broken

[Nigel H. <nj...@ba...>]

Whenever I try to use UDT::recvfile() UDT fails with the status
"connection was broken". I don't know why this is, are there
any pointers to what I'm doing wrong? UDT::sendfile() in the peer 
program reports no errors.

-Nigel

[UDT] UDT::accept

[Nigel H. <nj...@ba...>]

Currently UDT::accept takes a length argument that is an int, it would be
a good idea to overload this to accept a socklen_t argument to be consistent
with the Linux accept(2) system call.

-Nigel

-- 
Nigel Horne. Arranger, Adjudicator, Band Trainer, Composer, Tutor, Typesetter.
NJH Music, Barnsley, UK.  ICQ#20252325
nj...@ba... http://www.bandsman.co.uk

[UDT] udt server start over xinetd

[<Mac...@co...>]

Hallo,

i wrote a client server application to transfer files.
I`d like to start the server over the superdaemon xinetd. 
I know that xinetd uses fork.
Is there any possibility to work with udt and xinetd?
Im sorry for my bad english.

bye

Till 

Re: [UDT] General questions about performance

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

On Thu, 4 Jan 2007, Yunhong Gu wrote:

>
>
> There are many factors that can affect the transfer performance. In addition, 
> UDT is not necessarily always faster than TCP, especially on long bandwidth

Sorry, I meant "low bandwidth environments".


> environments. I do believe that you can modify the UDT code by yourself to 
> reach better performance, unfortunately this requires some understanding to 
> the code:)
>
> There are available tools using parallel TCP to boost transfer speed for home 
> network users.
>
> Yunhong Gu, Ph.D., 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, 2 Jan 2007, Yang wrote:
>
>> hi all, i tested sendfile/recvfile between two hosts on the same
>> university network (~1ms lag), but found the performance to be poor.
>> using http, i was able to transfer a 6.6MB file in 7.7s (~860KB/s),
>> but this took 17s using udt. one host is linux (just used 'make' to
>> build), the other is windows xp (built using visual studio).
>> 
>> i was wondering:
>> 
>> - is this result expected? i realize that my hosts have low latencies,
>> but i didn't think this explains the magnitude of the hit...nor that
>> the performance of udt would/should in any situation be worse than
>> tcp. my understanding is that a primary aim of udt is to maximize
>> throughput.
>> 
>> - is there anything (reasonably effortless) i can do to see better 
>> performance?
>> 
>> - are there other file transfer apps that do offer improved bandwidth
>> usage over tcp? i glanced at some of the papers' related works, and
>> the only other released software i found was tsunami (which i have not
>> tried).
>> 
>> - is there any reason why i should not expect to find such an app? (i
>> have zero background in networking. things i can imagine are:
>> userspace implementations have too much overhead to compete with
>> kernel tcp stack; isp's/routers prioritize tcp packets, which play
>> fairly, over other packets; etc.)
>> 
>> to give some background/a better idea of what i seek: i was ftp-ing
>> large files today between two hosts across the US at disappointing
>> rates when i got the idea to look into alternatives to tcp. i realize
>> that people have long researched protocols and congestion controls to
>> maximize throughput, particularly targeting the case of high
>> bandwidth*latency. i didn't want to subject myself to too much pain in
>> this endeavor (e.g., rebuilding kernels would be going too far), so i
>> set about looking on various open-source software sites for real-world
>> implementations using udp - and that's how i found udt. i haven't
>> found any other apps, though (except for tsunami, but i imagine that
>> udt is an improvement thereon).
>> 
>> thanks very much in advance!
>> 
>> -------------------------------------------------------------------------
>> Take Surveys. Earn Cash. Influence the Future of IT
>> Join SourceForge.net's Techsay panel and you'll get the chance to share 
>> your
>> opinions on IT & business topics through brief surveys - and earn cash
>> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
>> _______________________________________________
>> UDT-general mailing list
>> UDT...@li...
>> https://lists.sourceforge.net/lists/listinfo/udt-general
>> 
>

Re: [UDT] General questions about performance

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

There are many factors that can affect the transfer performance. In 
addition, UDT is not necessarily always faster than TCP, especially on 
long bandwidth environments. I do believe that you can modify the UDT code 
by yourself to reach better performance, unfortunately this requires 
some understanding to the code:)

There are available tools using parallel TCP to boost transfer speed for 
home network users.

Yunhong Gu, Ph.D., 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, 2 Jan 2007, Yang wrote:

> hi all, i tested sendfile/recvfile between two hosts on the same
> university network (~1ms lag), but found the performance to be poor.
> using http, i was able to transfer a 6.6MB file in 7.7s (~860KB/s),
> but this took 17s using udt. one host is linux (just used 'make' to
> build), the other is windows xp (built using visual studio).
>
> i was wondering:
>
> - is this result expected? i realize that my hosts have low latencies,
> but i didn't think this explains the magnitude of the hit...nor that
> the performance of udt would/should in any situation be worse than
> tcp. my understanding is that a primary aim of udt is to maximize
> throughput.
>
> - is there anything (reasonably effortless) i can do to see better performance?
>
> - are there other file transfer apps that do offer improved bandwidth
> usage over tcp? i glanced at some of the papers' related works, and
> the only other released software i found was tsunami (which i have not
> tried).
>
> - is there any reason why i should not expect to find such an app? (i
> have zero background in networking. things i can imagine are:
> userspace implementations have too much overhead to compete with
> kernel tcp stack; isp's/routers prioritize tcp packets, which play
> fairly, over other packets; etc.)
>
> to give some background/a better idea of what i seek: i was ftp-ing
> large files today between two hosts across the US at disappointing
> rates when i got the idea to look into alternatives to tcp. i realize
> that people have long researched protocols and congestion controls to
> maximize throughput, particularly targeting the case of high
> bandwidth*latency. i didn't want to subject myself to too much pain in
> this endeavor (e.g., rebuilding kernels would be going too far), so i
> set about looking on various open-source software sites for real-world
> implementations using udp - and that's how i found udt. i haven't
> found any other apps, though (except for tsunami, but i imagine that
> udt is an improvement thereon).
>
> thanks very much in advance!
>
> -------------------------------------------------------------------------
> Take Surveys. Earn Cash. Influence the Future of IT
> Join SourceForge.net's Techsay panel and you'll get the chance to share your
> opinions on IT & business topics through brief surveys - and earn cash
> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
> _______________________________________________
> UDT-general mailing list
> UDT...@li...
> https://lists.sourceforge.net/lists/listinfo/udt-general
>