Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Rich Newsgroups: comp.os.linux.misc Subject: Re: Are We Back to the "Wars" Now ? Date: Wed, 18 Dec 2024 14:03:53 -0000 (UTC) Organization: A noiseless patient Spider Lines: 46 Message-ID: References: <68b83l-jtd.ln1@ID-313840.user.individual.net> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Wed, 18 Dec 2024 15:03:53 +0100 (CET) Injection-Info: dont-email.me; posting-host="0a4897d36eecd2c0c7c91823a39c9faf"; logging-data="2449881"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18wQwscBuQEVAvkcxP+YTcr" User-Agent: tin/2.6.1-20211226 ("Convalmore") (Linux/5.15.139 (x86_64)) Cancel-Lock: sha1:82N+K91zNsUOb8Cym5tArZiBNzo= Bytes: 3411 Robert Riches wrote: > On 2024-12-18, Rich wrote: >> 186282@ud0s4.net <186283@ud0s4.net> wrote: >>> On 12/17/24 8:23 PM, Lawrence D'Oliveiro wrote: >>>> On Tue, 17 Dec 2024 13:34:30 +0000, Geoff Clare wrote: >>>> >>>>> With a pipe or FIFO, you just use simple read and write operations >>>>> and the system handles all the messy stuff for you. If the pipe >>>>> reaches capacity, write blocks until there is room to write some >>>>> more; if the pipe becomes empty, read blocks until there is more >>>>> data available; when read returns EOF that's the end of the data. >>>> >>>> Yup. Furthermore: >>>> >>>> * When the last writer closes its end, any remaining read attempts >>>> get EOF. >>>> * When the last reader closes its end, any remaining write attempts >>>> get “broken pipe”. >>> >>> But you're still limited to the amount of RAM the system can >>> access. >> >> Not with a pipe or FIFO, which is what is being discussed above. >> >> The amount of data you can transfer over a pipe is not in any way >> limited by system memory size or any other system imposed limits. >> >>> These days that's probably a LOT - but might NOT be, >>> esp for 'embedded' type boards like the older PIs, >>> BBBs and such. Never assume the user has essentially >>> infinite RAM. >> >> The system will not have infinite RAM. You can transfer infinite data >> over a pipe (although it will take a while to reach infinity). > > A pipe is _NOT_ limited to system RAM! > > Using a named pipe on a Raspberry Pi model 1 with a _half_ GB of > total RAM, I would routinely transfer _several_ GB in a single > stream from an mplayer process to a netcat process. The only > reason that's not currently happening every night these days is > the amplified TV antenna lost too much gain due to age, attic > heat, etc. While you are correct, you responded to the wrong post. I pointed out to the nymshift troll the exact statement you made to me.