ZeroMq IRC Log

Saturday October 23, 2010

[Time] Name	Message
[05:03] oscar	hi all, I have a simple question, but can't find the answer from the offical website. Is zeromq a super-socket? can it be used as a message queue?
[05:09] driethr	it is like a super-socket or a meta socket construct, but also you have to think about how you assemble the various pieces based on what you want to do.
[05:12] oscar	thanks. so, you mean that I need to implement message queue base on 0mq, right?
[05:13] driethr	actually I have only played with the zmq_forwarder utility which is used to publish and subscribe to messages. it comes with a zmq_queue binary so maybe that's what you'll be using?
[05:13] driethr	http://kfsone.wordpress.com/2010/07/21/zeromq-and-scalability/
[05:23] oscar	ok, thank you very mush.
[05:24] driethr	well so just to continue, you actually leverage the queue that is built into zeromq
[05:24] driethr	i dug up the example you can look at, hwclient.c and mtserver.c if you don't mind C code
[05:25] oscar	I love c code, thank you^^
[05:26] oscar	that's what i'm looking for:D
[05:26] driethr	yes I'll paste the github.com location for that from the zguide
[05:26] driethr	http://github.com/imatix/zguide/tree/master/examples/C/
[05:27] oscar	get it:)
[05:28] driethr	the queue is kind of like a forwarder that just listens to requests and then just sits there until it gets a corresponding response. so you would potentially have many requests just pending completion, and thus in-queue, individually, until they get their response.
[10:13] mikko	g'morning
[10:49] sustrik	mikko: hi, are you there?
[10:49] mikko	yes
[10:49] mikko	i added an irc bot to hudson
[10:49] sustrik	how does that work?
[10:49] mikko	#zeromq.build receives irc notifications
[10:49] mikko	05:05 <@dailybuild> Project ZeroMQ2_master build (90): SUCCESS in 3 min 35 sec: http://build.valokuva.org/job/ZeroMQ2_master/90/
[10:50] sustrik	ah, it's a different channel from #zeromq
[10:50] mikko	etc
[10:50] sustrik	wouldn't it make sense to channel it directly to #zeromq
[10:50] mikko	it looks like that i wont be in amsterdam on sunday (the work went too well last week and no need to return next week)
[10:50] sustrik	?
[10:50] sustrik	ok
[10:50] mikko	it produces a bit of flood on 5 am and pm
[10:50] sustrik	i see
[10:50] mikko	as every build notifies atm
[10:51] sustrik	it should be mentioned somewhere...
[10:51] sustrik	i mean that the irc channel exists
[10:51] mikko	i also found this http://wiki.hudson-ci.org/display/HUDSON/ChuckNorris+Plugin
[10:51] sustrik	:)
[10:52] sustrik	ha
[10:52] sustrik	is it possible to modify the main page?
[10:52] sustrik	if there's a notice saying "join #zeromq.builds" to see notficiations
[10:52] sustrik	people may actually find out that the channel exists
[10:53] sustrik	mikko: anyway, i had a different question; i am going to have a look at sun studio issues, how do switch the compiler to make it build with sunstudio?
[10:54] mikko	sustrik: http://build.valokuva.org/
[10:54] mikko	should be now on the front page
[10:54] sustrik	nice, but too small
[10:54] sustrik	easy to miss
[10:55] mikko	might require a CSS change for that
[10:55] mikko	ill look into it
[10:55] sustrik	and mention it is at freenode
[10:55] sustrik	it's not obvious
[10:55] mikko	you need to set CC and CXX env variables
[10:55] mikko	CC=/opt/sunstudio12.1/bin/cc CXX=/opt/sunstudio12.1/bin/CC
[10:55] sustrik	anything else?
[10:55] mikko	shouldn't need more than that
[10:56] sustrik	ok, thanks
[10:57] mikko	i submitted a patch for ZFL last night
[10:57] mikko	did that come through?
[10:59] sustrik	it's on the mailing list, pieter maintains zfl, so it's up to him
[10:59] mikko	ok
[10:59] sustrik	but his kid is ill, so he's kind of busy now
[11:01] mikko	gdb should be installed on the box as well
[11:07] sustrik	thanks
[11:19] sustrik	hm, anyone any idea what this error means:
[11:19] sustrik	Dwarf Error: Cannot find DIE at 0x14660 referenced from DIE at 0x40cbb [in module /home/martin/zeromq2/tests/test_pair_inproc]
[11:19] sustrik	?
[11:20] mikko	http://www.mail-archive.com/digitalmars-d-bugs@puremagic.com/msg04002.html
[11:20] mikko	first reference in google
[11:20] mikko	never seen that before
[11:23] mikko	hmm.. googling suggests that compiler might generate Dwarf 2 information that gdb doesn't understand
[11:24] mikko	http://mail-index.netbsd.org/port-arm/2004/09/08/0000.html
[11:24] sustrik	ok, it looks like it's only gdb complaining about debug format
[11:24] sustrik	has nothing to do with the failure itself
[11:27] mikko	/opt/sunstudio12.1/bin/dbx and http://blogs.sun.com/dbx/entry/gdb_vs_dbx_commands_mapping
[11:27] mikko	maybe?
[11:28] sustrik	nice
[11:28] sustrik	i've used dbx before
[11:28] sustrik	completely forgot about it in the meantime :)
[11:35] sustrik	mikko: got the problem, it's caused by different STL implementation
[11:35] sustrik	thanks for the help
[11:37] mikko	sustrik: nice!
[11:51] CIA-14	zeromq2: 03Martin Sustrik 07maint * r21b0c0b 10/ src/object.cpp :
[11:51] CIA-14	zeromq2: SunStudio fixed.
[11:51] CIA-14	zeromq2: With SunStudio's implementation of STL basic_string constructor
[11:51] CIA-14	zeromq2: doesn't accept NULL as a parameter even though size of string
[11:51] CIA-14	zeromq2: is set to zero. Fixed.
[11:51] CIA-14	zeromq2: Signed-off-by: Martin Sustrik <sustrik@250bpm.com> - http://bit.ly/bU6OuE
[11:52] CIA-14	zeromq2: 03Martin Sustrik 07master * r21b0c0b 10/ src/object.cpp :
[11:52] CIA-14	zeromq2: SunStudio fixed.
[11:52] CIA-14	zeromq2: With SunStudio's implementation of STL basic_string constructor
[11:52] CIA-14	zeromq2: doesn't accept NULL as a parameter even though size of string
[11:52] CIA-14	zeromq2: is set to zero. Fixed.
[11:52] CIA-14	zeromq2: Signed-off-by: Martin Sustrik <sustrik@250bpm.com> - http://bit.ly/bU6OuE
[11:52] CIA-14	zeromq2: 03Martin Sustrik 07master * rda59f8d 10/ src/object.cpp :
[11:52] CIA-14	zeromq2: Merge branch 'maint'
[11:52] CIA-14	zeromq2: * maint:
[11:52] CIA-14	zeromq2: SunStudio fixed. - http://bit.ly/c7vBnk
[12:43] CIA-14	zeromq2: 03Steven McCoy 07master * r8d69799 10/ (src/pgm_socket.cpp src/pgm_socket.hpp src/zmq.cpp):
[12:43] CIA-14	zeromq2: Changes for MSVC OpenPGM build.
[12:43] CIA-14	zeromq2: Signed-off-by: Steven McCoy <steven.mccoy@miru.hk> - http://bit.ly/bBiye2
[14:43] Sirupsen	I'm simply trying to make the first example from the guide compile in C, I run `gcc hwserver.c` and get a good bunch of "undefined reference to `zmq_*`" errors.
[14:46] Sirupsen	nvm
[14:48] sustrik	you have to include the header file
[14:54] Sirupsen	I
[14:55] Sirupsen	I try to run "./build all" from the zguides, however I get "gcc *.o: No such file or directory" on each file
[14:55] Sirupsen	Shouldn't that handle the "header file" you are talking about?
[14:57] sustrik	you should complain about zquide build system not working on the mailing list
[14:57] Sirupsen	I will
[15:44] DerGuteMoritz	can you guys explain to me wht the purpose of zmq_msg_copy?
[15:44] DerGuteMoritz	+is
[15:45] oscar	sirupsen, I met the same problem, and I'm debuging.....
[15:48] oscar	<sustrik>, I have the same problem with sirupsen, and I tried to include the zmq.h file, but it still can't find zmq_*....
[16:09] oscar	hi all......I'm trying to compile the hwserver.c file, but get "undefined reference to zmq_*" errors...Any help is appreciate.
[16:10] oscar	I've include the zmq.h file
[16:10] oscar	and zmq.h is exist.
[17:04] sustrik	DerGuteMoritz: It creates a copy of the message
[17:05] sustrik	oscar: can you paste the whole error text?
[17:06] oscar	ok
[17:06] DerGuteMoritz	sustrik: hm, according to the docs that is implementation dependent and that one should not modify a message after copying
[17:06] sustrik	not the whole log, just the line in question
[17:06] DerGuteMoritz	so I wonder what one could use read-only copies of messages for
[17:07] sustrik	send them to multiple destinations
[17:07] sustrik	zmq_send nullifies the message after it's sent
[17:07] DerGuteMoritz	ah I can't re-use the same message?
[17:07] DerGuteMoritz	alright
[17:07] oscar	s.c:(.text+0x23): undefined reference to `zmq_init'
[17:07] oscar	s.c:(.text+0x63): undefined reference to `zmq_socket'
[17:07] sustrik	and the command line?
[17:08] oscar	gcc s.c -o s
[17:08] sustrik	you have to link it with libzmq
[17:08] oscar	ohhh...I'll have a try
[17:08] oscar	./s: error while loading shared libraries: libzmq.so.0: cannot open shared object file: No such file or directory
[17:10] oscar	it compiled successful with libzmq, but after run it, it give this error
[17:10] sustrik	you have to have the paths set accordingly
[17:13] oscar	I installed 0mq as default path, why it give this error...
[17:14] DerGuteMoritz	oscar: why don't you use another language? the examples are given in different languages AFAIR
[17:15] oscar	<DerGuteMoritz>, I'm use c for now, and later will use php...
[17:19] kylezoa	oscar: have you tried 'export LD_LIBRARY_PATH=<path to zmq lib dir>'
[17:20] oscar	<kylezoa>thanks. I'm working in linux, I think I should to export that lib dir
[17:23] DerGuteMoritz	oscar: how do you call gcc
[17:24] DerGuteMoritz	?
[17:24] DerGuteMoritz	I mean now that you are linking to zmq
[17:25] oscar	<DerGuteMoritz> just call gcc directly
[17:25] DerGuteMoritz	what are the exact arguments?
[17:25] oscar	gcc sc.c -o s -lzmq
[17:26] DerGuteMoritz	that exact command line works for me here
[17:26] DerGuteMoritz	there must be something wrong with your path
[17:26] DerGuteMoritz	or your zmq installation
[17:27] oscar	I checked the file are in /usr/local/lib/ and /usr/local/lib/ folders. I think it should be right.
[17:28] oscar	I configure, make & make install in default
[17:28] DerGuteMoritz	well try adding -L/usr/local/lib/
[17:29] DerGuteMoritz	if that works, something is not set up as you think it is ;-)
[17:30] oscar	I added -L/usr/local/lib/, it still give this error:error while loading shared libraries: libzmq.so.0: cannot open shared object file: No such file or directory
[17:30] oscar	T_T
[17:30] sustrik	it's the issue or runtime path to shared libraries
[17:31] sustrik	some systems don't have /usr/local/lib on the path by default
[17:31] sustrik	set your LD_LIBRARY_PATH accordingly
[17:31] oscar	I type: whereis libzmq.so.0. it shows: libzmq.so: /usr/local/lib/libzmq.so.0 /usr/local/lib/libzmq.so
[17:32] sustrik	export LD_LIBRARY_PATH=/usr/local/lib
[17:33] oscar	ok...it works!! thank you very much ;-)
[17:33] sustrik	np
[17:35] oscar	will 0mq keep a message in memory until it be got?
[17:36] oscar	or a message wll be sent out immediately when it arrives 0mq server