ZeroMq IRC Log

Tuesday April 19, 2011

[Time] Name	Message
[08:42] djc	pieter_hintjens: you have "probabably" in the guide
[08:47] djc	I was wondering, are subscription filters applied on the publisher, on the subscriber, or is that behavior undefined?
[08:50] pieter_hintjens	djc: hi
[08:50] pieter_hintjens	they're applied on the subscriber at present
[08:51] djc	that's what I thought, perhaps it should be in the docs somewhere (possibly with caveat about future changes)
[08:51] pieterh	where does the guide say 'probably'? I can't find that
[08:51] djc	http://zguide.zeromq.org/page:all#toc40
[08:53] pieterh	that points to a section on zero copy... ??
[08:53] djc	yeah, and in the second line it has "probabably"
[08:53] pieterh	heh
[08:54] pieterh	djc: thanks for catching that, fixing it now
[09:14] djc	pieterh: so can you add something about the filtering behavior, too?
[09:14] djc	either to the guide or to the reference
[09:15] pieterh	I don't have write access to the reference
[09:15] pieterh	but I'll add this to the guide, yes
[09:15] djc	nice
[09:16] guido_g	pieterh: and while you're at it: https://github.com/imatix/zguide/issues/50 :)
[09:16] djc	final question for the day: is there any intended ETA for 2.1.5? as the gentoo maintainer, I'm kind of looking forward to 2.1.5 :)
[09:16] guido_g	howdy all, btw
[09:16] pieterh	hi guido_g
[09:16] pieterh	djc: there are no real issues with 2.1.4 in fact
[09:16] drbobbeaty	pieterh: I need to talk to David still about the support contract. I'm sorry it's taking so long, but I'm in the middle of a near-impossible time-frame.
[09:17] pieterh	drbobbeaty: np
[09:17] drbobbeaty	pieterh: the only issue I know of with 2.1.4 is the one Martin patched just today with the message bit flags.
[09:17] djc	pieterh: sure, I just want --with-system-pgm
[09:17] drbobbeaty	I'm going to try it today
[09:17] pieterh	djc, ah, ok
[09:17] pieterh	drbobbeaty: that was message validation afaik
[09:17] pieterh	i.e. runtime validation that message objects are sane
[09:17] drbobbeaty	yes indeed.
[09:18] pieterh	djc: I'll push the 2.1.5 release up for you then
[09:18] djc	awesome
[09:20] pieterh	guido_g: would a link to the git repository & explanation be OK?
[09:20] guido_g	pieterh: i think so
[09:20] pieterh	ok, making that now
[09:21] guido_g	the issue came up yesterday where one looked for something but wasn't aware of the Guides repo and the examples
[09:22] djc	pieterh: also, in the "Getting the Message Out" section, it would be nice if "In Chapter Two I'll explain how to" came with a more concrete reference to a section in chapter 2
[09:23] pieterh	djc: I don't like making concrete references because they're a pain to maintain
[09:23] pieterh	lacking tools to do it properly, for now
[09:23] pieterh	will think about improving this...
[09:24] djc	what tech are you using for the guide?
[09:25] pieterh	djc: well, it's in the repo bin directory, a perl script that mangles text into wikidot format
[09:25] djc	it feels kind of silly that you only have a kind of abstract reference and I have to go hunting for the section if I want it, particularly for html docs
[09:25] pieterh	yeah, I know
[09:25] djc	perhaps you should learn sphinx?
[09:25] djc	it's pretty easy and very powerful
[09:25] pieterh	djc: won't help
[09:26] pieterh	the tool chain is very specific
[09:26] djc	what's very specific about it?
[09:26] pieterh	well, it turns text diagrams into images, extracts code blocks and colorizes them
[09:26] pieterh	builds all the links in the text
[09:26] djc	sphinx comes with a graphviz extension, so you can still do the graphs
[09:26] djc	and it also has code blocks and syntax highlighting
[09:27] djc	all built in
[09:27] pieterh	djc: forget it :-) srsly
[09:27] djc	mkay
[09:27] pieterh	unless you're willing to rewrite the whole guide to fit...
[09:28] djc	I could take a stab at it, if you're willing to use sphinx after that :)
[09:28] pieterh	however, if you want to collect any weak references in the text, I'll turn them into hyperlinks
[09:28] pieterh	djc: you're welcome to play with it, the text is all open source
[09:28] pieterh	but seriously, it's not going to work, there's a reason I made this from scratch
[11:04] drbobbeaty	pieterh: Are you planning on a 2.1.5? And if so, will the patch Martin sent this morning about the Seg Fault on zmq_msg_size() make it in? And when would you be cutting that 2.1.5 release?
[11:10] sustrik	drbobbeaty: hi
[11:10] sustrik	what version are you using today?
[11:11] drbobbeaty	2.1.4, and I can patch it with your patch, but I wondered if Pieter was going to cut another release sometime soon. I thought I saw him say something about it earlier this morning
[11:11] sustrik	not sure whether the patch would apply cleanly
[11:12] sustrik	i guess, i should commit it to the master
[11:12] sustrik	and move it to pieter for backporting
[11:12] drbobbeaty	That would be great.
[11:12] sustrik	ok
[11:13] sustrik	done
[11:13] drbobbeaty	Wow... exceptionally fast. Thanks.
[12:18] NikolaVeber	mikko, I can't find the php-zmq package in PECL
[12:18] NikolaVeber	is that a feature or a bug? :)
[12:24] mikko	NikolaVeber: feature
[12:24] mikko	http://pear.zero.mq/
[12:24] NikolaVeber	then there is a bug in the installation docs ;)
[12:25] mikko	php docgen autogenerates those
[12:25] NikolaVeber	but pear works even better :)
[12:25] mikko	i'll update them at some point
[12:25] NikolaVeber	great, thanks!
[12:25] NikolaVeber	maybe just update README
[12:26] NikolaVeber	thats the first place I looked
[12:27] mikko	updated
[12:50] NikolaVeber	thanks!
[14:01] NikolaVeber	mikko, I'm getting 'Failed to bind the ZMQ: Address already in use'
[14:01] NikolaVeber	on what I believe should be a persistent socket
[14:02] NikolaVeber	I have set $context = new ZMQContext(1, true);
[14:03] NikolaVeber	and $queue = new ZMQSocket($context, ZMQ::SOCKET_PUSH, "MySock1");
[14:03] NikolaVeber	then bind to tcp://*:5555
[14:03] mikko	you bind persistent socket only once
[14:03] mikko	you might have socket in the background that's been bound
[14:03] mikko	the persistent sockets work a lot better with connecting sockets
[14:04] NikolaVeber	so I should check in each call if the persistent socket is up and running
[14:04] NikolaVeber	and if not, bind it?
[14:05] guido_g	it's not a matter of the Ã¸mq socket, it's like that the port is already used
[14:06] guido_g	given that you bind to every available interface this is not surprising
[14:07] NikolaVeber	I'm testing this isolated, after restarting the apache, I can bind again
[14:07] NikolaVeber	but I'll try with connecting, not binding
[14:08] NikolaVeber	that I need to change anyhow.. :)
[14:30] mikko	NikolaVeber: with connecting use the on_new callback
[14:30] mikko	that is called only when new underlying socket is created
[14:38] neale1	My introduction to 0MQ article was published in the April/May z/Journal (a web/paper magazine for IBM mainframe users). http://www.mainframezone.com/it-management/lightweight-messaging-middleware/P1
[14:52] mikko	neale1: have you had any follow-ups / reactions?
[14:54] neale1	It only came out a few days ago. It looks like I'll be presenting on it in Orlando in August at the IBM user group meeting "SHARE"
[15:09] NikolaVeber	mikko, I followed this example
[15:09] NikolaVeber	http://php.zero.mq/zmqsocket.connect.html
[15:10] NikolaVeber	can you point me to the on_new references in the docs?
[15:10] NikolaVeber	sorry
[15:10] NikolaVeber	got it
[15:22] ianbarber	neale1: very nice article!
[15:25] neale1	Tks
[15:43] jfs	anybody know if any problems building pyzmq (via easy_install pyzmq) on osx against zeromq 2.1.4? I'm getting the error "zmq/core/constants.c:2574: fatal error: error writing to -: Broken pipe"
[17:39] ketralnis	How does setsockopt(ZMQ_SUBSCRIBE, filter) behave with multipart messages? Does it match only the first body?
[18:16] cremes	ketralnis: it matches the bytes in the first message part only
[18:16] cremes	so you should always prepend your topic to the first thing you send
[18:21] ketralnis	cremes: thanks :)
[18:21] cremes	you are welcome
[18:49] CudaDeveloper	How do I get push/pull not to do fair sheduling? When one worker is much slower than the rest, fair scheduling means it holds everything up.
[19:42] cremes	CudaDeveloper: fair scheduling is the only kind available for those sockets; if you need a different algo, you will need to roll
[19:42] cremes	your own and (likely) build it on top of xreq/xrep
[19:56] crodas	hi guys, I have little doubt about pubsub
[19:56] crodas	is this the right place to ask?
[19:56] crodas	or mailing list is better?
[20:01] crodas	I'm building a chat server using pubsub. I'm wondering which is better, subscribe my peers to many channels, or if they listen to their account ID and I send one message to each one (message goes to channel)
[20:05] cremes	crodas: i would start with one pub socket for all channels
[20:06] cremes	then each chat user would subscribe to the channels they care about
[20:06] crodas	cremes: so the peers are subscribing to their channel ?
[20:06] crodas	great
[20:06] crodas	thanks
[20:06] cremes	all chat messages go to a single pub socket
[20:06] cremes	so, yes
[20:06] crodas	btw, I'm going to give a talk about ZeroMQ in Jun :-)
[20:07] crodas	it is so awesome that I have to tell the people about it
[20:07] cremes	great enws
[20:07] crodas	(I'm using it with PHP and NodeJS)
[20:07] cremes	nodejs scales nicely so it will pair up with 0mq quite well
[20:07] crodas	indeed
[20:08] crodas	but mongrel2 with any other language (such as PHP) is awesome
[20:12] mikko	crodas: where is the talk?
[20:12] crodas	Rio de Janeiro, Brazil
[20:12] crodas	it is 100% confirmed yet
[20:12] crodas	but almost
[20:13] mikko	which conference is that?
[20:17] crodas	I don't recall, looking no
[20:17] crodas	now
[20:17] crodas	FSLDC (FÃ³rum de Software Livre de Duque de Caxias)
[20:18] crodas	http://forumsoftwarelivre.com.br/2011/
[20:18] crodas	perhaps someone could record the talk
[20:18] sustrik	nice
[20:18] crodas	(It'd be in English, I don't speak Portuguese, just Spanish and English)
[20:19] sustrik	once you have the talk confirmed, place a link to zero.mq page
[20:19] crodas	how do I do that?
[20:19] sustrik	it's wiki
[20:19] crodas	cool, I'll do it
[20:20] sustrik	great
[20:21] crodas	I'll upload my slides next week
[20:21] crodas	so I can have feedback
[20:21] crodas	I'm kinda new with ZeroMQ (~2 months) but I'm using it already on various projects
[20:25] ianbarber	to be honest, i think with 0mq you spend a few weeks learning everything the library can do, and then months understanding good messaging architectures :) that's part of the fun
[20:27] crodas	ianbarber: actually Derick Rethans (I don't know how to spell it) showed me your video
[20:27] crodas	I became a fun since then :-)
[20:27] crodas	fanatic
[20:27] ianbarber	:)
[20:27] crodas	kudos, I owe lots of beers
[20:28] ianbarber	giving further talks is the best payback :) i'll have to thank derick next time i see him
[20:28] crodas	I'll spread the word here in South America