Path: ...!eternal-september.org!feeder2.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Rich <rich@example.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: Are We Back to the "Wars" Now ?
Date: Sun, 24 Nov 2024 19:36:57 -0000 (UTC)
Organization: A noiseless patient Spider
Lines: 30
Message-ID: <vhvv8p$2c45s$1@dont-email.me>
References: <Sp-cnSz8UupYQaf6nZ2dnZfqnPednZ2d@earthlink.com>   <lIqcnTlkpf_Jtd36nZ2dnZfqn_udnZ2d@earthlink.com> <vhp9hs$12qaa$2@dont-email.me> <v4adnSK1nItcwNz6nZ2dnZfqnPWdnZ2d@earthlink.com> <vhrolu$1jata$1@dont-email.me> <Oo6dnZb3z-NT6Nz6nZ2dnZfqnPednZ2d@earthlink.com> <vhsdbi$1m6qu$1@dont-email.me> <vhth7o$1s5d5$4@dont-email.me> <heednZLHO-zE69_6nZ2dnZfqn_idnZ2d@earthlink.com> <vhvd06$2900d$1@dont-email.me> <vhvht1$28nn4$1@dont-email.me> <wwvldx8qw98.fsf@LkoBDZeT.terraraq.uk>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Date: Sun, 24 Nov 2024 20:36:57 +0100 (CET)
Injection-Info: dont-email.me; posting-host="f9f41132f628b1fe2d858245900693aa";
	logging-data="2494652"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1/QHuzMUiYSmfVbq20RxNSV"
User-Agent: tin/2.6.1-20211226 ("Convalmore") (Linux/5.15.139 (x86_64))
Cancel-Lock: sha1:7NlJH/RikqAtc7hBoyfCgR+E+hE=
Bytes: 2603

Richard Kettlewell <invalid@invalid.invalid> wrote:
> Lew Pitcher <lew.pitcher@digitalfreehold.ca> writes:
>> On Sun, 24 Nov 2024 14:25:10 +0000, Rich wrote:
>>> 186282@ud0s4.net <186283@ud0s4.net> wrote:
>>>> On 11/23/24 4:25 PM, Lawrence D'Oliveiro wrote:
>>>>> That’s irrelevant.  Pipes originated on the earliest Unix machine, 
>>>>> which was a PDP-11 with only a 64kiB address space.  They work great 
>>>>> for pumping around gigabytes of data, but you don’t need 
>>>>> gigabyte-sized memory buffers to do that.
>>>> 
>>>>   It all has to be SOMEWHERE ... if not in RAM then
>>>>   on a mass storage device.
>>> 
>>> Nope, at least not with pipes.
>>
>> Hold on a sec.... pipes are /buffered/ in RAM, so there's at least
>> a small bit of ram set aside for each open pipe.
> 
> The word ‘all’ isn’t just decoration.  The claim was ‘it all has to be
> somewhere’, and Rich’s point (as I understand it) is that it does not
> all have to be somewhere.
> 
> For example,
> 
>   head -c $((1024*1024*1024)) /dev/urandom | sha256sum
> 
> puts a gigabyte of data through a pipe, but at no point does anything
> allocate anywhere close to a gigabyte of storage of any kind.

Exactly.