[zeromq-dev] is pgm transport working in alpha3?

George Coles george.coles at quantitative.com
Thu Nov 5 22:38:58 CET 2009


Will pgm support in windows get full support? I do not have first hand knowledge of this but a colleague seemed to come to the conclusion that multicast on windows is hobbled.

From: zeromq-dev-bounces at lists.zeromq.org [mailto:zeromq-dev-bounces at lists.zeromq.org] On Behalf Of Pavol Malosek
Sent: Thursday, November 05, 2009 4:35 PM
To: Yuri Finkelstein
Cc: zeromq-dev at lists.zeromq.org
Subject: Re: [zeromq-dev] is pgm transport working in alpha3?

Hello,

This bug was solved few weeks ago (commit 39d915de)
Here is the patch against alpha3

--- zeromq-2.0-alpha3-orig/src/pgm_receiver.cpp 2009-09-23 11:44:50.000000000 +0200
+++ zeromq-2.0-alpha3/src/pgm_receiver.cpp      2009-11-05 23:18:36.000000000 +0100
@@ -153,7 +153,6 @@
         // information (sizeof uint16_t).
         raw_data +=  sizeof (uint16_t);
         nbytes -= sizeof (uint16_t);
-        zmq_assert (apdu_offset <= nbytes);

         //  New peer.
         if (it == peers.end ()) {
@@ -174,6 +173,7 @@
         //  Now is the possibility to join the stream.
         if (!it->second.joined) {

+            zmq_assert (apdu_offset <= nbytes);
             zmq_assert (it->second.decoder == NULL);

             //  We have to move data to the begining of the first message.
Thanks for the report anyway!

malo


----- Original Message -----
From: Yuri Finkelstein<mailto:yurif2005 at gmail.com>
To: Pavol Malosek<mailto:malosek at fastmq.com>
Sent: Thursday, November 05, 2009 8:40 PM
Subject: Re: [zeromq-dev] is pgm transport working in alpha3?

Another issue. This works:

-bash-3.2$ ./perf/c/local_thr "udp://;226.0.0.1:5555<http://226.0.0.1:5555>" 1024 10
message size: 1024 [B]
message count: 10
mean throughput: 1250000 [msg/s]
mean throughput: 10240.000 [Mb/s]


But this doesn't:
-bash-3.2$ ./perf/c/local_thr "udp://;226.0.0.1:5555<http://226.0.0.1:5555>" 1024 100
Assertion failed: apdu_offset <= nbytes (pgm_receiver.cpp:156)
Aborted

On Thu, Nov 5, 2009 at 11:07 AM, Yuri Finkelstein <yurif2005 at gmail.com<mailto:yurif2005 at gmail.com>> wrote:
Thanks! Indeed, if I lower the message size and count the setup below works.
I'm not sure what role does this pgm bug/feature play in it, but one thing looks fairly sure to me: in perf samples, the pgm_rate has to be derived from the message size and count supplied on the command line rather then being set to a constant.

Also, printing a meaningful error text on stderr in case of r c!= 0 would be a very good idea :)

Yuri

On Thu, Nov 5, 2009 at 2:52 AM, Pavol Malosek <malosek at fastmq.com<mailto:malosek at fastmq.com>> wrote:
Hello Yuri,

There was a bug/feature in OpenPGM rate limiter which could cause the problem you are describing.
http://groups.google.com/group/openpgm-dev/browse_thread/thread/2e40a5d428d9b27a

Since 0MQ II default rate for PGM is 100kb/s try to increase it
add in your remote/local_thr.cpp
//  Add your socket options here.
//  For example ZMQ_RATE, ZMQ_RECOVERY_IVL and ZMQ_MCAST_LOOP for PGM.
uint64_t pgm_rate = 50000; // 50Mb/s
int rc = zmq_setsockopt (s, ZMQ_RATE, &pgm_rate, sizeof (pgm_rate));
assert (rc == 0);

HTH

Yes you are right, in 0MQ II there is no zmq_server at all.

malo

----- Original Message -----
From: Yuri Finkelstein<mailto:yurif2005 at gmail.com>
To: zeromq-dev at lists.zeromq.org<mailto:zeromq-dev at lists.zeromq.org>
Sent: Wednesday, November 04, 2009 11:26 PM
Subject: [zeromq-dev] is pgm transport working in alpha3?

I'm trying to run the perf test using openpgm multicast and can't get it to work:

machine 1:

 sudo ./perf/cpp/local_thr "udp://eth0;226.0.0.1:5555<http://226.0.0.1:5555>" 1024 100000

machine 2
 sudo ./perf/cpp/remote_thr "udp://eth0;226.0.0.1:5555<http://226.0.0.1:5555>" 1024 100000


the remote_thr process exits silently after few seconds.

Some time after that tje local_thr process reports:
** (process:32674): WARNING **: peer expired, tsi 227.186.205.113.22.215.39440


No evidence ot packets sent or received. The same works with TCP as expected.

I tried pgm:// with the same result.

I do see both processes joining multicast group on their boxes using netstat -g.

Documentation for 1.0 version says that zmq_server needs to be running in the background for multicast to work. But in 2.0 alpha there is no such process needed anymore. Right?


What's wrong here?

Thanks,
Yuri
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