From v.velox at vvelox.net  Fri Feb 12 23:53:03 2010
From: v.velox at vvelox.net (Zane C.B.)
Date: Sat, 13 Feb 2010 01:53:03 -0600
Subject: [Chicago-talk] threading Question
In-Reply-To: <4B5DCB10.6040804@gmail.com>
References: <4B5DCB10.6040804@gmail.com>
Message-ID: <20100213015303.792b06d0@vixen42.vulpes.vvelox.net>

On Mon, 25 Jan 2010 10:47:12 -0600
packet <fasteliteprogrammer at gmail.com> wrote:

> Does it matter if you have 1 cpu or 4 cpu for programming threads
> in perl and why?
> 
> 
> I got 1 cpu on the laptop and 4 cpu on my desktop.Just want to know
> this been bugging me for  abit.:)

I love forking, when it comes to writing things like daemons. When it
comes to stuff like that, even on a single core system, it offers a
massive improvement.

The only issue I've ever run into, is that it is a bitch, passing
information between between each instance.
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From jon-chicagotalk at jrock.us  Sun Feb 14 00:27:15 2010
From: jon-chicagotalk at jrock.us (Jonathan Rockway)
Date: Sun, 14 Feb 2010 02:27:15 -0600
Subject: [Chicago-talk] threading Question
In-Reply-To: <20100213015303.792b06d0@vixen42.vulpes.vvelox.net> (Zane C. B.'s
	message of "Sat, 13 Feb 2010 01:53:03 -0600")
References: <4B5DCB10.6040804@gmail.com>
	<20100213015303.792b06d0@vixen42.vulpes.vvelox.net>
Message-ID: <87hbpknrx8.fsf@snowball2.jrock.us>

* On Sat, Feb 13 2010, Zane C.B. wrote:
> The only issue I've ever run into, is that it is a bitch, passing
> information between between each instance.

Hence threads.

(But not ithreads, which is just fork without copy and write.)

I really recommend using Coro for network daemons.  It will easily
handle 30,000+ open and idle connections.  (And only that few because
that's when my machine runs out of file descriptors.)  If you need to
use all 4 CPUs, run four copies of your daemon.

Regards,
Jonathan Rockway

--
print just => another => perl => hacker => if $,=$"

From lembark at wrkhors.com  Sun Feb 14 12:45:22 2010
From: lembark at wrkhors.com (Steven Lembark)
Date: Sun, 14 Feb 2010 15:45:22 -0500
Subject: [Chicago-talk] threading Question
In-Reply-To: <87hbpknrx8.fsf@snowball2.jrock.us>
References: <4B5DCB10.6040804@gmail.com>
	<20100213015303.792b06d0@vixen42.vulpes.vvelox.net>
	<87hbpknrx8.fsf@snowball2.jrock.us>
Message-ID: <20100214154522.01d865cdlembark@wrkhors.com@wrkhors.com>

On Sun, 14 Feb 2010 02:27:15 -0600
Jonathan Rockway <jon-chicagotalk at jrock.us> wrote:

> * On Sat, Feb 13 2010, Zane C.B. wrote:
> > The only issue I've ever run into, is that it is a bitch, passing
> > information between between each instance.
> 
> Hence threads.
> 
> (But not ithreads, which is just fork without copy and write.)
> 
> I really recommend using Coro for network daemons.  It will easily
> handle 30,000+ open and idle connections.  (And only that few because
> that's when my machine runs out of file descriptors.)  If you need to
> use all 4 CPUs, run four copies of your daemon.

Under all but the fewest of cases, threading 
offers so much more pain that data passing that 
forking will usually be a better approach -- at 
least on *NIX [VMS spawn's have their own problems
and Windawg doesn't support real forks].

The amount of data that has to be moved is usually
small, and success/failure or a set of pre-defined
choices can easily be handled by exit codes.

If you have to move more data, there are standard
approaches for socket interfaces -- POE being the
most adaptable and thus complicated, simple listen+
select being the easiest also well supported by 
perly modules.

Shared memory is quite simple to manage with Perl
and has generally less overhead than threading.

An attitude of first verifying that forks will
accomplish your needs reasonably before trying
threads will pay off handsomly in reduced pain
over the long term.

enjoi

-- 
Steven Lembark                                            85-09 90th St.
Workhorse Computing                                 Woodhaven, NY, 11421
lembark at wrkhors.com                                      +1 888 359 3508

From jeremy at marzhillstudios.com  Tue Feb 16 09:21:51 2010
From: jeremy at marzhillstudios.com (Jeremy Wall)
Date: Tue, 16 Feb 2010 11:21:51 -0600
Subject: [Chicago-talk] threading Question
In-Reply-To: <87hbpknrx8.fsf@snowball2.jrock.us>
References: <4B5DCB10.6040804@gmail.com>
	<20100213015303.792b06d0@vixen42.vulpes.vvelox.net>
	<87hbpknrx8.fsf@snowball2.jrock.us>
Message-ID: <69d143cd1002160921j57030ad1m1f7134b55e03999c@mail.gmail.com>

First I've heard of Coro. I'm going to check it out now since I have an
upcoming application for just that sort of thing. And continuation style is
just what the doctor ordered.

On Sun, Feb 14, 2010 at 2:27 AM, Jonathan Rockway
<jon-chicagotalk at jrock.us>wrote:

> * On Sat, Feb 13 2010, Zane C.B. wrote:
> > The only issue I've ever run into, is that it is a bitch, passing
> > information between between each instance.
>
> Hence threads.
>
> (But not ithreads, which is just fork without copy and write.)
>
> I really recommend using Coro for network daemons.  It will easily
> handle 30,000+ open and idle connections.  (And only that few because
> that's when my machine runs out of file descriptors.)  If you need to
> use all 4 CPUs, run four copies of your daemon.
>
> Regards,
> Jonathan Rockway
>
> --
> print just => another => perl => hacker => if $,=$"
> _______________________________________________
> Chicago-talk mailing list
> Chicago-talk at pm.org
> http://mail.pm.org/mailman/listinfo/chicago-talk
>



-- 
Jeremy Wall
http://jeremy.marzhillstudios.com
Jeremy at marzhillstudios.com
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From pcmantz at gmail.com  Thu Feb 25 18:23:52 2010
From: pcmantz at gmail.com (Paul Mantz)
Date: Thu, 25 Feb 2010 20:23:52 -0600
Subject: [Chicago-talk] Fwd: Hackathon: Quiet Riot this Saturday!
In-Reply-To: <42f28fe1002251755s2551ebadwc4b6018ae620fdbc@mail.gmail.com>
References: <42f28fe1002251755s2551ebadwc4b6018ae620fdbc@mail.gmail.com>
Message-ID: <42f28fe1002251823h58fdd593q8300560089724ac9@mail.gmail.com>

Hey guys,

If you have time you'll come to the hackathon this Saturday.  Also, if
anyone's looking for help with any CPAN project, I'd be more than
happy to donate a couple hours.

---------- Forwarded message ----------
From: Paul Mantz <pcmantz at gmail.com>
Date: Thu, Feb 25, 2010 at 7:55 PM
Subject: Hackathon: Quiet Riot this Saturday!
To: pumping-station-one at googlegroups.com,
pumping-station-one-public at googlegroups.com


Hello everyone,

Sorry for the late call-out, but we're having our monthly coding
hackathon this Saturday, February 27, at 8pm; or whenever you want to
show up. ?We've had a lot of good projects come out of this, and we
always want to see more. ?We're going to shut of the power tools,
ingest a lot of caffeine, and crank out some code.

Everyone's welcome to attend. ?Bring a laptop (or other project!) and
come code, reverse engineer, architect, and/or solder the night away.

Name: Hackathon: Quiet Riot Edition
Location: Pumping Station: One, 3354 N. Elston, Chicago, IL
Date: Saturday, February 27, 2010. Repeats every 4th Saturday.
Time: 8:00PM to Noon (Sunday)


Happy hacking!

--
Paul Mantz
http://www.mcpantz.org
Zmanda - Open source backup and recovery http://www.zmanda.com/

PS. Forward widely!

From richard at rushlogistics.com  Sun Feb 28 16:16:43 2010
From: richard at rushlogistics.com (Richard Reina)
Date: Sun, 28 Feb 2010 19:16:43 -0500 (EST)
Subject: [Chicago-talk] =?utf-8?q?capturing_the_pts/=3F?=
Message-ID: <20100301001643.42BE7600@captain.xo.com>

Does anyone know if there is a perl function that in linux captures the terminal number (pts/0, pts/1, pts/3, etc.) that the script is being run in?

Thanks,

Richard

From andrew at cleverdomain.org  Sun Feb 28 17:01:01 2010
From: andrew at cleverdomain.org (Andrew Rodland)
Date: Sun, 28 Feb 2010 19:01:01 -0600
Subject: [Chicago-talk] capturing the pts/?
In-Reply-To: <20100301001643.42BE7600@captain.xo.com>
References: <20100301001643.42BE7600@captain.xo.com>
Message-ID: <201002281901.01533.andrew@cleverdomain.org>

On Sunday 28 February 2010 06:16:43 pm Richard Reina wrote:
> Does anyone know if there is a perl function that in linux captures the
> terminal number (pts/0, pts/1, pts/3, etc.) that the script is being run
> in?

POSIX::ttyname. Call it as ttyname(0), or if you want to be a bit more 
persistent, do:

sub get_tty {
  for (0 .. 2) {
    if (my $ttyname = POSIX::ttyname($_)) {
      return $ttyname;
    }
  }
  return;
}

which works as long as one of stdin, stdout, or stderr is connected to a 
terminal (often, like when running in a pipeline, stdin and stdout will both 
be opened to a pipe or a file, but stdout will still be pointing to the 
terminal, so this is a good trick.)

Andrew