[zeromq-dev] UDP message with zeromq 2.0beta

Guo, Yanchao Yanchao.Guo at sac.com
Thu Jan 21 10:04:41 CET 2010

I believe the client code is blocking. So what I did is that I start client first, which keeps running until it gets a message; then I start server. 

I know the packet is lost, as the server exits as it completed the sending, but client is still running as it doesn't receive message. 


-----Original Message-----
From: Martin Sustrik [mailto:sustrik at 250bpm.com]
Sent: Thu 1/21/2010 3:08 AM
To: Guo, Yanchao
Cc: zeromq-dev at lists.zeromq.org
Subject: Re: [zeromq-dev] UDP message with zeromq 2.0beta

> Hi Martin, I am trying the simple test program for udp, and I setup a 
> simple pair of server/client on my machine. Out of 10 messages, I only 
> get like 4 or 5 messages successfully received. I understand that UDP 
> doesn't guarantee that all message to be delivered , but I think the 
> success rate is just too low. Did you see the same for your testing?

There's no real storage for the messages on the network switch or 
elsewhere, so you won't get historical messages. For example: Send a 
message, close the sender application. Open the receiver application, 
ask for message => you'll get nothing. You have to have both 
applications running to guarantee lossless semantics.


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