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Dear Gu,
Thank you for pursuing this.
The problem appears immediately for me .. it must be the increased RTT that makes the difference. If it would help for me to run the instrumented version I would be happy to. Also, please let me know if I should request the test account.
Andrei.
2009-07-10 18:08:43 UTC in udt
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I think there is a minimum RTT that is needed but not sure what that is. I know that it doesn't appear on a shorter RTT. I know some people have/use network emulators but I'm not an expert in networking so I am afraid I cannot help further. If there is no other way I may be able to get in touch with my overseas partners and see if we could give you an account to test, at least for a while. Maybe...
2009-07-09 16:28:07 UTC in udt
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oops, just saw that on the sender the UDP buffer was smaller than the UDT one
Increased size of all SND buffers to 80000000 .. as well as that of the RCV buffers on the receiving end but still get a crash.
2009-07-08 22:21:47 UTC in udt
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Hi,
I just upgraded to 4.5 and have a very very weird issue when using UDT on a long-distance connection (150ms RTT), using the rate-based plug-in.
The problem is that when I instruct the sender to send at a high rate the receiver crashes.
The size of the data that needs to be transferred needs to be large as well, for the crash to occur (1000000000 bytes is enough ..)
The problem...
2009-07-08 21:48:20 UTC in udt
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I did do another run with the CVS version of Dec 10 and didn't see any improvement (in throughput).
I am working with the rate-based plug-in because that works best on dedicated links.
memcpy is up to 60% of the overall execution time on the sender side ..
will you add the zero-copy option back? I'm sure there are many users that can understand the concept
of not touching the buffer. Well...
2008-12-11 23:28:01 UTC in udt
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Hi,
I was running some profiling on my UDT-based data transfer application (using latest release 4.3)
and it seems memcpy still is the bottleneck in the system, with about 40-50%
of execution time on both sender and receiver (have callgrind files available).
I can see how it would be harder to get rid of this on the receiving end - but
should be possible to reduce it to just reordering...
2008-12-09 01:38:29 UTC in udt
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Hello,
I was wondering if anybody has any experience building and running UDT on AIX.
We got stuck running the example programs getting the following error:
bind: Connection setup failure: unable to create/configure UDP socket: No buffer space available.
Any idea?
Thank you,
Andrei.
2008-10-21 19:50:31 UTC in udt
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Just a quick note, it doesn't always crash but when it does it seems to be around that point in the transfer. And I didn't get a crash on a local connection, must be influenced by the RTT.
2008-04-09 23:25:50 UTC in udt
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I'm trying to run some tests on a ~ 150 ms RTT dedicated 10G connection using udt 4.2
and unfortunately it keeps on crashing when transferring large messages (1 Gbyte).
The crash occurs after transferring 100-200 Mbytes.
Seems that in buffer.cpp one of the variables is not checked
to see if it is null or not before being accessed. I don't know enough
about the algorithm to say more ....
2008-04-09 22:16:26 UTC in udt
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Just to confirm, I reverted to 3.3 and it works fine.
Andrei.
2007-10-02 00:14:06 UTC in udt
