[26523] in Perl-Users-Digest
Perl-Users Digest, Issue: 8673 Volume: 10
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Wed Nov 16 14:05:23 2005
Date: Wed, 16 Nov 2005 11:05:05 -0800 (PST)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Wed, 16 Nov 2005 Volume: 10 Number: 8673
Today's topics:
Re: "Killed" Message On Linux (Running From BASH) <hal@thresholddigital.com>
Re: "Killed" Message On Linux (Running From BASH) <hal@thresholddigital.com>
Re: LOESS (aka LOWESS) xhoster@gmail.com
Re: LOESS (aka LOWESS) <no_given_address@landofthelost.net>
Re: LOESS (aka LOWESS) <no_given_address@landofthelost.net>
Re: strange problem with system() and backtick operator <tadmc@augustmail.com>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Wed, 16 Nov 2005 11:20:48 -0500
From: Hal Vaughan <hal@thresholddigital.com>
Subject: Re: "Killed" Message On Linux (Running From BASH)
Message-Id: <MO6dncJQnsrCwebeRVn-gg@comcast.com>
Gregory Toomey wrote:
> Hal Vaughan wrote:
>
>> I've tried Googling this and get a high noise-to-signal ratio.
>>
>> I'm running Perl scripts on Linux (Debian, Sarge), from the command line
>> (in
>> bash), and I get a "Killed" message. I can't find enough to verify this
>> is
>> coming from Perl or bash or where.
>
> Large process running out of virtual memory?
>
> gtoomey
That was my first thought, but it's one Perl program, on 1.5 GB of memory,
that had run before, a number of times, on a system with 1/2 that amount
(and this system has fewer daemons and such running). I would also think
if that were the case, running it under the same conditions every time
would produce the same results. It doesn't.
Hal
------------------------------
Date: Wed, 16 Nov 2005 11:22:25 -0500
From: Hal Vaughan <hal@thresholddigital.com>
Subject: Re: "Killed" Message On Linux (Running From BASH)
Message-Id: <MO6dnf1QnspdwebeRVn-gg@comcast.com>
Lars Kellogg-Stedman wrote:
>> At the least, I'd like to know what is issuing this "Killed" message (is
>> this what happens when another program kills a Perl script?), or what
>> could be causing this.
>
> Some shells (e.g., bash) print this message if a process dies due to
> receiving a SIGKILL. Try this:
>
> In xterm 1, run:
>
> sleep 30
>
> In xterm 2, run:
>
> killall -9 sleep
>
> You'll probably see the message "Killed" in xterm 1. I'm not sure what
> would be causing this -- it is unlikely that something is sending
> spontaneous KILL signals to your processes, unless (a) you're running
> extremely low on memory and (b) the Linux OOM killer kills processes in
> this fashion.
>
> -- Lars
>
Aha!
That's it. With that info, I tracked down a program that wasn't supposed to
be running (I'm not finished testing it yet), that tracks down and kills
certain programs if they don't register in a database first. Somehow a
stray instance was still in memory, killing other programs.
Thanks!
Hal
------------------------------
Date: 16 Nov 2005 17:14:38 GMT
From: xhoster@gmail.com
Subject: Re: LOESS (aka LOWESS)
Message-Id: <20051116121438.261$FA@newsreader.com>
"Mr. No Address" <no_given_address@landofthelost.net> wrote:
> Been some time since I was here and now I'm almost fearful to post.
> Have I googled enough? Have I searched CPAN enough? Did I read all the
> books? Have I done everything reasonable to try and answer my question
> before posting here? Ah, what the hell...
>
> Locally Weighted Robust Regression (LOWESS or LOESS). Boss says it's
> the thing to use for a particular job that needs to be done. Is there a
> Perl module out there that does this?
Did the boss say you had to do it in Perl? I'd seriously consider using R
for this, perhaps interfaced to Perl.
Xho
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------------------------------
Date: Wed, 16 Nov 2005 10:17:43 -0700
From: "Mr. No Address" <no_given_address@landofthelost.net>
Subject: Re: LOESS (aka LOWESS)
Message-Id: <dlfr0s$b70$1@news.nems.noaa.gov>
A. Sinan Unur wrote:
> "Mr. No Address" <no_given_address@landofthelost.net> wrote in news:dldq1l$tkt$1@news.nems.noaa.gov:
>>Locally Weighted Robust Regression (LOWESS or LOESS). Boss says it's
>>the thing to use for a particular job that needs to be done. Is there a
>>Perl module out there that does this?
>
>
> I am not sure why one would use Perl for this task. There is a regression
> module which I have used in the past, and could be used to compute the
> local weighted regressions at each point.
>
> http://www.mathworks.com/access/helpdesk/help/toolbox/curvefit/ch_data7.html
> http://www.itl.nist.gov/div898/handbook/pmd/section1/pmd144.htm
>
> I would be much more inclined to use a numeric computation package for
> this, say, S-Plus (or R), MatLab (or Octave), Mathematica, Gauss, SAS, or
> even use some Fortran code from netlib:
>
> See also:
>
> http://cm.bell-labs.com/cm/ms/departments/sia/wsc/smoothsoft.html
I'm sure Perl isn't the best choice from a programming sense, but it is
what I know so I was curious if a solution existed. I'm aware that R
includes this so I'll probably end up going with that, though I don't
know R so there will be an additional hurdle to get past.
------------------------------
Date: Wed, 16 Nov 2005 11:00:42 -0700
From: "Mr. No Address" <no_given_address@landofthelost.net>
Subject: Re: LOESS (aka LOWESS)
Message-Id: <dlfthe$ea1$1@news.nems.noaa.gov>
xhoster@gmail.com wrote:
> "Mr. No Address" <no_given_address@landofthelost.net> wrote:
>
>>Locally Weighted Robust Regression (LOWESS or LOESS). Boss says it's
>>the thing to use for a particular job that needs to be done. Is there a
>>Perl module out there that does this?
>
>
> Did the boss say you had to do it in Perl? I'd seriously consider using R
> for this, perhaps interfaced to Perl.
Thanks for your comment. That is the direction I'm heading.
------------------------------
Date: Wed, 16 Nov 2005 11:03:08 -0600
From: Tad McClellan <tadmc@augustmail.com>
Subject: Re: strange problem with system() and backtick operator
Message-Id: <slrndnmpic.4v8.tadmc@magna.augustmail.com>
Martin Kissner <news@chaos-net.de> wrote:
> A. Sinan Unur wrote :
>>
>> perldoc -f oct
>>
>> oct EXPR
>> oct Interprets EXPR as an octal string and returns the
^^^^^^
^^^^^^
>> corresponding value.
>>
>> Notice the "octal string".
^^^^^^
^^^^^^
>> A number is just a number, that is it.
> Thank you for your help.
> This clarifies a lot.
But you don't "have it" yet, so let's keep trying...
There is an abstract concept called a "number".
There are many _representations_ for any particular "number".
Let's use the number "ten" for example:
1010 ( 2)
12 ( 8)
10 (10)
0A (16)
8 + 2
11 - 1
All of those representations correspond to the *same number*, they
are just different ways of writing the same thing.
> If I understand right, I should use "chmod oct($mode), 'file'" (like I
> did ;-)) if $mode is the result of an addition
No!
You should use "chmod oct($mode) when $mode is a *string*
(not when it is a number).
> (and not an octal value).
There is no such thing as an "octal value".
There could be a number that is represented in octal (base 8) though.
I don't think you understand Perl's data types well enough yet,
have a look at the "Scalar values" section in:
perldoc perldata
A scalar may contain one single value in any of three
different flavors: a number, a string, or a reference.
You need to be able to understand which one you've got if you
hope to process it correctly (sans DWIMery).
--
Tad McClellan SGML consulting
tadmc@augustmail.com Perl programming
Fort Worth, Texas
------------------------------
Date: 6 Apr 2001 21:33:47 GMT (Last modified)
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End of Perl-Users Digest V10 Issue 8673
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