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Re: query: how many use PHP for linux scripts [message #185974 is a reply to message #185968]

Fri, 16 May 2014 07:12

crankypuss
Messages: 147
Registered: March 2011

Karma:

Senior Member

On 05/15/2014 10:48 AM, The Natural Philosopher wrote:
> On 15/05/14 17:13, crankypuss wrote:
>> On 05/15/2014 07:52 AM, The Natural Philosopher wrote:
>>> On 15/05/14 13:34, Jasen Betts wrote:
>>>> including files with lines larger than RAM + swap.
>>>
>>> THAT is challenge!
>>>
>>> Have to use temporary files..
>>>
>>>
>>
>> Whatever for? You need enough "disk" space to contain the input file
>> and the output file, you need enough memory to contain the two largest
>> contiguous records
>
> but in the case specified, you dont have that space.
>
>
> and the code to read-2-(swap-2)-write-2. Whether the
>> swap involves actual data movement or not is a nit, it boils down to a
>> file-copy 2 lines at a time. (Wouldn't surprise me if the "cp" command
>> has some option for this kind of thing along with the rest of the
>> kitchen sink... or is that "tar" that I'm thinking of...)
>>
>> Unless of course I'm missing something, I'm feeling stupider with each
>> post about this exercise that I read. <g>
>
> "*lines* larger than RAM + swap" is the key.

Ah, now I see. If you want to make up a difficult problem, that's
swell. Throw in the additional requirement that there are so many
records that there isn't enough "RAM + swap" to contain all the record
offsets. Add an architectural requirement that it support bytes of
infinite and variable length if that makes it more fun.

PHP has access to the same stream-io routines in stdlib that a C
application would use. I have little interest in unsolvable theoretical
problems when so many practical problems remain poorly solved.

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[Message index]

		query: how many use PHP for linux scripts By: crankypuss on Tue, 13 May 2014 08:17
		Re: query: how many use PHP for linux scripts By: Arno Welzel on Tue, 13 May 2014 08:37
		Re: query: how many use PHP for linux scripts By: Tim Streater on Tue, 13 May 2014 10:52
		Re: query: how many use PHP for linux scripts By: Auric__ on Tue, 13 May 2014 13:28
		Re: query: how many use PHP for linux scripts By: Jonathan N. Little on Tue, 13 May 2014 14:29
		Re: query: how many use PHP for linux scripts By: Collin Pruitt on Tue, 13 May 2014 15:00
		Re: query: how many use PHP for linux scripts By: crankypuss on Tue, 13 May 2014 16:05
		Re: query: how many use PHP for linux scripts By: Johnny on Tue, 13 May 2014 16:32
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Tue, 13 May 2014 18:09
		Re: query: how many use PHP for linux scripts By: Tim Streater on Tue, 13 May 2014 20:35
		Re: query: how many use PHP for linux scripts By: JEDIDIAH on Tue, 13 May 2014 21:10
		Re: query: how many use PHP for linux scripts By: Tim Streater on Tue, 13 May 2014 22:03
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Tue, 13 May 2014 23:55
		Re: query: how many use PHP for linux scripts By: Chris Ahlstrom on Wed, 14 May 2014 00:26
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Wed, 14 May 2014 00:37
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:18
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Wed, 14 May 2014 12:20
		PHP Gui Toolkits (was: query: how many use PHP for linux scripts) By: Christoph Michael Bec on Wed, 14 May 2014 12:58
		Re: PHP Gui Toolkits By: crankypuss on Thu, 15 May 2014 08:04
		Re: PHP Gui Toolkits By: Christoph Michael Bec on Thu, 15 May 2014 12:38
		Re: PHP Gui Toolkits By: The Natural Philosoph on Thu, 15 May 2014 12:59
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 08:01
		Re: query: how many use PHP for linux scripts By: Chris Ahlstrom on Wed, 14 May 2014 10:40
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Wed, 14 May 2014 12:23
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:00
		Re: query: how many use PHP for linux scripts By: JEDIDIAH on Wed, 14 May 2014 19:49
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 08:44
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 09:17
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:39
		Re: query: how many use PHP for linux scripts By: Tim Streater on Wed, 14 May 2014 11:29
		Re: query: how many use PHP for linux scripts By: JEDIDIAH on Wed, 14 May 2014 19:54
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 20:50
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Thu, 15 May 2014 02:49
		Re: query: how many use PHP for linux scripts By: JEDIDIAH on Thu, 15 May 2014 14:45
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Thu, 15 May 2014 16:35
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 08:07
		Re: query: how many use PHP for linux scripts By: Jonathan N. Little on Thu, 15 May 2014 11:58
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 15:55
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Thu, 15 May 2014 12:08
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 16:04
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 03:42
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:21
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 11:32
		Re: query: how many use PHP for linux scripts By: Ben Bacarisse on Wed, 14 May 2014 12:39
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 14:23
		Re: query: how many use PHP for linux scripts By: Christoph Michael Bec on Wed, 14 May 2014 18:00
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 20:48
		Re: query: how many use PHP for linux scripts By: Ben Bacarisse on Wed, 14 May 2014 21:18
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 22:10
		Re: query: how many use PHP for linux scripts By: Ben Bacarisse on Wed, 14 May 2014 21:05
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 22:07
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Thu, 15 May 2014 02:51
		Re: query: how many use PHP for linux scripts By: Jasen Betts on Thu, 15 May 2014 12:34
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Thu, 15 May 2014 13:52
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 16:13
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Thu, 15 May 2014 16:48
		Re: query: how many use PHP for linux scripts By: crankypuss on Fri, 16 May 2014 07:12
		Re: query: how many use PHP for linux scripts By: Jasen Betts on Fri, 16 May 2014 11:29
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Fri, 16 May 2014 12:03
		PHP integers (was: query: how many use PHP for linux scripts) By: Christoph Michael Bec on Fri, 16 May 2014 12:16
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Thu, 15 May 2014 14:03
		Re: query: how many use PHP for linux scripts By: Ben Bacarisse on Thu, 15 May 2014 15:26
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 16:07
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Thu, 15 May 2014 16:37
		Re: query: how many use PHP for linux scripts By: Christoph Michael Bec on Thu, 15 May 2014 17:14
		Re: query: how many use PHP for linux scripts By: Ben Bacarisse on Fri, 16 May 2014 01:45
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Fri, 16 May 2014 08:25
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Fri, 16 May 2014 13:14
		Re: query: how many use PHP for linux scripts By: crankypuss on Fri, 16 May 2014 07:17
		Re: query: how many use PHP for linux scripts By: Thomas 'PointedEars' on Thu, 15 May 2014 17:33
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 08:36
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Wed, 14 May 2014 09:09
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:58
		Re: query: how many use PHP for linux scripts By: Allodoxaphobia on Tue, 13 May 2014 21:23
		Re: query: how many use PHP for linux scripts By: Mike Yetto on Tue, 13 May 2014 23:02
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:24
		Re: query: how many use PHP for linux scripts By: Mike Yetto on Wed, 14 May 2014 21:23
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Thu, 15 May 2014 02:53
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 08:13
		Re: query: how many use PHP for linux scripts By: Chris Ahlstrom on Thu, 15 May 2014 10:09
		Re: query: how many use PHP for linux scripts By: crankypuss on Thu, 15 May 2014 16:16
		Re: query: how many use PHP for linux scripts By: Thomas 'PointedEars' on Thu, 15 May 2014 16:49
		Re: query: how many use PHP for linux scripts By: Jasen Betts on Fri, 16 May 2014 12:02
		Re: query: how many use PHP for linux scripts By: crankypuss on Fri, 16 May 2014 14:17
		init-system, bash, etc. (was: query: how many use PHP for linux scripts) By: Christoph Michael Bec on Fri, 16 May 2014 16:48
		Re: query: how many use PHP for linux scripts By: Mike Yetto on Thu, 15 May 2014 12:02
		Re: query: how many use PHP for linux scripts By: Aragorn on Thu, 15 May 2014 01:16
		Re: query: how many use PHP for linux scripts By: crankypuss on Tue, 13 May 2014 18:20
		Re: query: how many use PHP for linux scripts By: Johnny on Tue, 13 May 2014 18:35
		Re: query: how many use PHP for linux scripts By: Mike Yetto on Tue, 13 May 2014 23:04
		Re: query: how many use PHP for linux scripts By: crankypuss on Wed, 14 May 2014 09:26
		Re: query: how many use PHP for linux scripts By: Jerry Stuckle on Wed, 14 May 2014 12:28
		Re: query: how many use PHP for linux scripts By: The Natural Philosoph on Tue, 13 May 2014 16:26

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