ZeroMq IRC Log

Sunday May 22, 2011

[Time] Name	Message
[05:08] sneak	hi
[05:10] sneak	does 0mq support ipv6?
[05:22] eimantas	hello people!
[05:23] sneak	hi
[05:23] sneak	it's you
[05:24] eimantas	<o>
[05:24] eimantas	still angry on me? .(
[05:24] sneak	wasn't angry before
[05:51] johnm1234	Re: ipv6...
[05:51] johnm1234	Looks like the answer is basicallyâ¦ no.
[05:52] johnm1234	There seems to be some support for ipv6 in pgm_socket.cpp but nowhere else afaict.
[06:09] guido_g	it has been removed due to dual-stack problems
[06:15] johnm1234	Can you explain a bit of the details?
[06:17] guido_g	nope
[06:17] johnm1234	:-)
[06:17] guido_g	wasn't involved
[06:18] guido_g	try hte mailing list archives
[06:19] sneak	ugh
[07:59] uiuiui132	Hi guys. Would zeromq be a good fit to fire and monitor a process?
[13:09] fredix	hi
[13:10] fredix	is zeromq works through the Internet ? for example with pubsub, without subscribers limit
[14:13] BoukeVersteegh	Good day
[14:13] BoukeVersteegh	Anyone here?
[14:14] sustrik	hi
[14:14] sustrik	fredix: in theory
[14:14] sustrik	the problem with internet is if it sends junk data to 0mq
[14:15] sustrik	0mq it not 100% resistent to that
[14:15] sustrik	we are fixing it slowly
[14:15] sustrik	but not quite there yet
[14:15] fredix	ok
[14:15] BoukeVersteegh	hi
[14:15] fredix	so zeromq is only for backendl only ?
[14:15] BoukeVersteegh	is there anyone who could help me on the PHP lib for ZMQ?
[14:16] BoukeVersteegh	I have attended the presentation at the Dutch PHP Conference on ZMQ, and I really want to use it
[14:16] BoukeVersteegh	but the extension throws an error: php: symbol lookup error: /usr/lib/php5/20090626+lfs/zmq.so: undefined symbol: zmq_version
[14:16] sustrik	fredix: well, you can use it for a front end, if there's a problem, report it, we'll fix it
[14:17] sustrik	BoukeVersteegh: sorry, no experience with PHP binding
[14:17] BoukeVersteegh	where can I get help?
[14:17] sustrik	ask on the maling list
[14:18] BoukeVersteegh	ok
[14:18] fredix	sustrik, ok thanks
[14:20] BoukeVersteegh	are the version numbers of the language-specific bindings in sync with those of the main ZMQ code?
[14:20] BoukeVersteegh	on the front page it says ZMQ version 2.1, but the PHP lib in PECL is version 0.7
[14:21] sustrik	not in sync, i presume
[14:22] sustrik	anyway, ask on list
[14:22] Toba	fredix: I would not.
[15:05] pieter_hintjens	BoukeVersteegh: sounds like it can't find the zmq.so library at all...
[15:16] pieter_hintjens	sustrik: you around?
[15:22] mikko	BoukeVersteegh: which version of libzmq are you using?
[15:32] CIA-31	libzmq: 03Martin Sustrik 07bidi-pipes * racf0b0e 10/ (34 files): Introduces bi-directional pipes ...
[15:44] sustrik	pieter_hintjens: hi
[15:45] pieter_hintjens	hi, just wondering about framing for udp
[15:45] pieter_hintjens	do you have any preferences?
[15:45] sustrik	i think there's no single solution
[15:45] sustrik	depends on what you want to do with udp
[15:46] pieter_hintjens	just use it as udp...
[15:47] pieter_hintjens	I'm thinking, limit messages to 64k, serialize multiple parts in one buffer
[15:47] sustrik	udp what?
[15:47] sustrik	unicast?
[15:47] sustrik	multicast?
[15:47] pieter_hintjens	any of that, it's really all quite similar
[15:48] pieter_hintjens	let's assume unicast, broadcast, and multicast
[15:48] pieter_hintjens	I have a virtual transport (very simple) more or less working
[15:50] sustrik	is there an initial handshake?
[15:50] pieter_hintjens	might add that, depends on the pattern
[15:50] pieter_hintjens	I'm still figuring out how much of 0MQ I want to replicate :-)
[15:50] sustrik	:)
[15:50] sustrik	well, for now i would say keep it as simple as possible
[15:51] pieter_hintjens	at least for basic UDP integration, it's pretty simple
[15:51] sustrik	no mutlipart messages
[15:51] pieter_hintjens	indeed
[15:51] sustrik	1 packet = 1 message
[15:51] sustrik	that's it
[15:51] pieter_hintjens	ok, that's what I have, it'll do...
[15:51] pieter_hintjens	I am aiming for a generic virtual transport layer into which we can plug drivers
[15:51] sustrik	yep, i know
[15:52] pieter_hintjens	btw I'm going to be in the US for two weeks
[15:52] pieter_hintjens	if you need me, add 9 hours... :-)
[15:53] sustrik	west coast, nice
[15:53] sustrik	have a nice time there
[15:53] pieter_hintjens	yeah, west coast is always nice, but not as cool as BA, obviously...
[17:00] michelp	pieter_hintjens, out of curiosity, where on the WC? We have a budding 0mq community here in Portland, OR
[17:00] michelp	i can strike up a quick BOF if you're headed our way :)
[17:00] pieter_hintjens	michelp: Seattle, and then SF
[17:01] michelp	it's pretty much right between those two points :)
[17:01] pieter_hintjens	a lot closer to Seattle, I see
[17:01] pieter_hintjens	but still a long walk
[17:01] michelp	yeah it sure is!
[17:01] pieter_hintjens	Google maps says 2 days, 12 hours
[17:02] michelp	well unlike much of the US we have a good train schedule between here and there
[17:02] pieter_hintjens	michelp: would you like to try a meetup in Seattle or is that too far away?
[17:02] michelp	i think there's 3 or 4 trains a day
[17:02] michelp	sure, i know a few python folks up there that would be interested, and i can bring a crew with me
[17:02] michelp	are you doing some kind of meetup already?
[17:02] pieter_hintjens	I'd be free next Friday
[17:02] pieter_hintjens	nothing planned for Seattle yet
[17:03] michelp	just vacationing?
[17:03] pieter_hintjens	work
[17:03] pieter_hintjens	what is that 'vacation' you speak of?
[17:03] michelp	ah nice, yeah i think it would be cool to get some like minds together
[17:03] michelp	it's a strange concept at first, but you should try it sometime, it'll grow on you :)
[17:03] pieter_hintjens	well, I could come to Portland tbh
[17:04] michelp	either way, you would find Portland to be very european
[17:04] michelp	in fact i'd say it's the most european city in the US
[17:05] pieter_hintjens	lol, I suspect we have different ideas of what a "European" city is
[17:05] pieter_hintjens	but ok, let's try to make that happen
[17:05] michelp	true, i was thinking in terms of density, urban planning, and mass transit
[17:05] pieter_hintjens	friday evening then?
[17:05] pieter_hintjens	I'll take the train down from Seattle
[17:06] pieter_hintjens	and got to SF on Saturday
[17:06] pieter_hintjens	*go
[17:06] michelp	ah i see i misunderstood you, i thought you were arriving friday, but thats' your free day then?
[17:06] pieter_hintjens	yup
[17:06] michelp	that would work for me, I'll start putting the word out immediately
[17:06] pieter_hintjens	ok, great
[17:07] michelp	i can 90% likely get a really great meeting space downtown
[17:07] michelp	unless they have something else planned it should be no problem
[17:07] pieter_hintjens	nice... if you think an early afternoon start would work, I can be there earlier, say 2pm
[17:08] michelp	i'd have to look into it, can you give me a couple hours to send some emails?
[17:08] pieter_hintjens	np
[17:08] pieter_hintjens	when you find a place, let me know so I can book a hotel near by
[17:08] pieter_hintjens	do announce on list, and add to wiki...
[17:08] pieter_hintjens	excellent :-)
[17:10] michelp	alright i'm on it. hotels should be no problem as the location is right downtown and also adjacent to the train stop that goes straight to the airport
[17:12] pieter_hintjens	how European :-)
[17:12] pieter_hintjens	I like it
[17:12] michelp	yeah the train from seattle is right there too so you won't needs cabs or anything
[17:12] michelp	all easy walking distance
[17:13] michelp	do you have some prepared material or were you expecting just a discussion session?
[17:13] michelp	and just to be specific when you say next friday you mean the 27th right?
[17:15] pieter_hintjens	so yes, 27th, and you can choose any time that works
[17:15] pieter_hintjens	prepared material is so boring but depending on the people and location and time, we can do different styles
[17:15] pieter_hintjens	mix of rant, unconf and beerfest is my usual preference
[17:16] michelp	well there is a keg :)
[17:16] michelp	one of the great features of this particular space :)
[17:16] pieter_hintjens	in portland?
[17:16] pieter_hintjens	ah, in that space... ok :-)
[17:17] michelp	there's also a beer hall across the street with 20 rotating taps. all high quality beers, none of that mass produced crap we are infamous for
[17:18] pieter_hintjens	ok, when you have a place & time, would you update the wiki and let the list know?
[17:18] pieter_hintjens	I'
[17:18] pieter_hintjens	I'll make sure I'm there in time
[17:18] michelp	yep chatting with the guy now, should have details shortly
[17:21] michelp	so it looks like 5pm is best for them
[17:22] michelp	does that work for you pieter_hintjens ?
[17:22] pieter_hintjens	michelp: sure, that works fine
[17:23] michelp	the location is on this page: http://urbanairship.com/company/contact/
[17:24] michelp	here's the walk from the train station http://maps.google.com/maps?f=d&source=s_d&saddr=union+station,+portland,+or&daddr=1227+Northwest+Davis+Street,+Portland,+Oregon+97209-4119+(Urban+Airship)&hl=en&geocode=Fd-2tgIdCxiw-CnvNBLg_wmVVDEyh8GJnvHB0g%3BFY-qtgIdHgWw-CHkdTCpKM5d_imDMuRoAgqVVDELnVu6Ab1YVw&mra=ls&sll=45.525647,-122.682082&sspn=0.009275,0.022724&ie=UTF8&z=17
[17:30] michelp	kdj, you in?
[17:34] klokane	hi there, I've question about zeromq and fork
[17:34] pieter_hintjens	michelp: would you stick the relevant info on a wiki page?
[17:34] pieter_hintjens	zeromq.org/event:portland-2011-05-27 would do it
[17:35] pieter_hintjens	you can then link to that from the main community page, and people can self-register
[17:35] pieter_hintjens	did that for http://www.zeromq.org/event:brussels-2011-05-10
[17:36] michelp	pieter_hintjens, yep no problem. just signing in and figuring it out
[17:36] pieter_hintjens	klokane: shoot
[17:36] klokane	I've process "A" with REQ-REP and PUB-SUB, R-R is for console, P-S is monitoring childs. Via console you may add new childs.
[17:37] pieter_hintjens	ok
[17:37] klokane	but childs make different work and just reporting to parent
[17:38] klokane	So make it by fork() && exec() and child fall to daemon
[17:38] pieter_hintjens	ok
[17:38] klokane	but after fork() it still holds sockets from parent
[17:39] klokane	so, when parent will exit, child are sitting on their socket
[17:39] pieter_hintjens	the fork is a new process, with its own memory, right?
[17:40] klokane	pieter: it's correct
[17:40] pieter_hintjens	if you open a socket and then fork, the socket will be unusable from the child process
[17:40] klokane	yes
[17:40] pieter_hintjens	well, it'll be usable but do weird things, since it's using the same identity, etc.
[17:40] klokane	but when I exit from parent
[17:41] pieter_hintjens	right, you can safely close the sockets in the children
[17:41] pieter_hintjens	but this is probably a dangerous model to use
[17:41] klokane	is there correct way how to do it?\
[17:42] pieter_hintjens	hmm, starting a process properly, not via forking, I'd say
[17:42] pieter_hintjens	hmm
[17:42] pieter_hintjens	good question klokane
[17:42] klokane	where i start working proces assync from console it's ok
[17:43] pieter_hintjens	why do you want processes, instead of threads?
[17:43] klokane	I need functionality with async work
[17:43] pieter_hintjens	sure, but threads will do that
[17:44] pieter_hintjens	what language are you working in?>
[17:44] klokane	c++
[17:44] pieter_hintjens	ok, so you can use the czmq binding, it gives you a portable thread API
[17:44] klokane	but same problems are there with other languages
[17:45] klokane	I dont want to make it throught threads
[17:45] michelp	pieter_hintjens, the wiki won't let me create a page in the event category
[17:45] pieter_hintjens	michelp: permissions issue, let me fix that
[17:45] michelp	sweet
[17:46] pieter_hintjens	michelp: ok, try again now
[17:46] pieter_hintjens	klokane: I don't know anyone using fork() successfully
[17:46] klokane	worker is grabbing video from multicasting stream, so there is relative high posibility to false
[17:46] pieter_hintjens	only way I can think of is to fork from a main process that doesn't do any 0MQ work at all
[17:46] pieter_hintjens	so you fork the server, and fork the clients
[17:46] klokane	failure
[17:47] pieter_hintjens	yeah, I know
[17:47] pieter_hintjens	but if you open a socket, then fork your process, failure afaics
[17:47] klokane	yess that's trouble which i get :)
[17:47] pieter_hintjens	can you make a minimal test case, send to the list?
[17:48] michelp	sweet thanks
[17:48] klokane	well I'll try it
[17:48] pieter_hintjens	See http://www.zeromq.org/docs:issue-tracking
[17:48] pieter_hintjens	with a minimal issue, we can think of how to solve this
[17:48] pieter_hintjens	I'm sure it's doable
[17:49] klokane	thx
[17:49] pieter_hintjens	k
[18:17] mikko	evenin'
[18:18] michelp	it's on: http://www.zeromq.org/event:portland-2011-05-27
[19:25] sneak	hi guys
[19:26] sneak	so i've decided that i want to build a queueserver for my application (a 'stable' part in zmq lingo) but i want there to be two or four
[19:26] sneak	i'm wondering if there's some existing design pattern for writing the clients for this "device"
[19:27] sneak	will connect() block if it can't connect? should i iterate through them?
[19:30] neopallium	sneak: connect() is async. it will not block.
[19:31] sneak	i can plod if that's what's necessary
[19:31] sneak	what happens if i try to send to a socket that can't connect to the tcp port (e.g. server isn't running)
[19:32] sneak	is there any way of making connect block to ensure i am talking to a working endpoint?
[19:32] sneak	is there any failover mechanism?
[19:33] pieter_away	sneak: how much of the Guide have you read?
[19:34] sneak	apparently not enough? :P
[19:35] sneak	scanning it now, i read the page on github or wherever that ended up trailing off into just headers
[19:35] sneak	i thought that was the guide, didn't realize there was more
[19:42] pieter_away	you should find what you need in there, around ch3 and ch4
[19:42] pieter_away	http://zguide.zeromq.org has the full text
[19:51] michelp	there is much, much more :)
[19:51] michelp	i have to keep picking up around ch3 due to brain melt.
[19:51] michelp	i had a total eureka moment today when i combined the notion of consistent hashing with 0mq
[19:52] michelp	i was trying to hard to communicate in a distributed fashion with centralized data, distributing the data consistently is making my 0mq connection patterns way simpler and more powerful
[19:58] michelp	hey zedas, just read about fmlr, what language were you looking to implement it in?
[20:03] michelp	whoa tnetstrings
[20:56] fabien1	Hi all.
[20:57] fabien1	I'm trying to put my mind around the socket_base_t implementations and can't figure out how the ticks member works.
[20:58] fabien1	It seems to be set to 0 all the time, and only increment in the condition of a loop where, incidently, it is reset to zero again.
[20:59] fabien1	Sorry, misread the code.
[20:59] fabien1	Start to be tired I think.
[22:27] sneak	if i am subscribed using a ZMQ::SUB, does the filtering happen at the other end or are the messages transferred and then discarded?