New subject: udp-sender does not wait at all?

28 May 2004

At first I was, but when I couldn't get the multicast senders to wait
for the clients I tried manually running udp-sender and receiver.

This to take flamethrower out of the equation and to pinpoint what was
causing it.

However, I already found the bug, and made a patch for it this morning.

The problem is the time struct udp-sender uses to store the time at
which the first receiver connects is never initialized to 0, while a if
statement later on assumes that the value is 0 if no receiver has
connected yet.

This causes the udp-sender doesn't know the time of the first connected
client and that it doesn't wait

The fix is initializing the variable correctly and setting it to 0. 

I have attached a diff patch which corrects it, it works great now :)

Regards,
Ramon.

...
  -----Original Message-----
 From: Brian Elliott Finley [mailto:finley@mcs.anl.gov]
 Sent: donderdag 27 mei 2004 17:46
 To: Ramon Bastiaans
 Cc: udpcast(a)udpcast.linux.lu
 Subject: Re: [Udpcast] udp-sender does not wait at all?

 Are you using flamethrower to do this?

 Thus spake Ramon Bastiaans (bastiaans(a)sara.nl):
 >Hi,
 >
 >I have been working on getting multicast systemimager image broadcasts
...
  >to work, but I am having a hard time.
 >
 >Is it just me (am I doing something wrong?) or does udp-sender
 >completely ignore the wait and client parameters?
 >
 >Udp-sender doesn't wait at all for a minimum number of clients, after
 >the first connection, it immediately starts the multicast to the first
...
  >client.
 >
 >On the server:
 >
 ># udp-sender --pipe 'tar -B -S -cpf - -C /home/test/sara/ramon/testdir .
...
  >' --portbase 12345 --min-clients 20 --max-wait
1800 --min-wait 600 --fec
...
  >8x8/128 --interface eth0 --max-bitrate 20M
--full-duplex --nopointopoint
...
  >--nokbd
 >stripes=8 redund=8 stripesize=128
 >Udp-sender 2004-02-22
 >Using mcast address 234.168.44.1
 >Compressed UDP sender for (stdin) at 10.168.44.1 on eth0
 >Broadcasting control to 10.168.44.255
 >New connection from 10.168.44.5  (#0) 00000019
 >Starting transfer: 00000019
 >bytes=     11 929 600 re-xmits=000000 (  0.0%) slice=1024  73 709 551
 >615 -   0
 >Transfer complete.
 >Disconnecting #0 (10.168.44.5)
 >
 >On the client:
 >
 ># udp-receiver --interface eth0 --portbase 12345 --nokbd --nosync --file
...
  >./bla.tar
 >Udp-receiver 2004-02-22
 >UDP receiver for ./bla.tar at 10.168.44.5 on eth0
 >received message, cap=00000019
 >Connected as #0 to 10.168.44.1
 >Listening to multicast on 234.168.44.1
 >bytes=     11 929 600  ( 15.91 Mbps)     11 929 600
 >Transfer complete.
 >ramon@u5:~/1.udptest$
 >
 >
 >Now there is no timestamps, but the udp-sender starts the multicast in
...
  >about 2 seconds after the connect from the client.
But the sender does
...
  >not have 20 clients connected, and it didn't
wait 10 minutes at all (I
...
  >kind of overdid the values here, but with lower
values it doesn't work
...
  either).

Am I missing something?

Kind regards,

Ramon Bastiaans.

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 --
 ------------------------------------------------------
  Brian Elliott Finley           Argonne, MCS Division
  Mobile: 630.631.6621           Office:  630.252.4742
  gpg --keyserver wwwkeys.pgp.net --recv-keys 10F8EE52
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RE: [Udpcast] udp-sender does not wait at all?