From: Peter Jeremy <peter@rulingia.com>
To: David Arnold <davida@pobox.com>
Cc: The Eunuchs Hysterical Society <tuhs@tuhs.org>
Subject: Re: [TUHS] core
Date: Wed, 20 Jun 2018 15:04:54 +1000 [thread overview]
Message-ID: <20180620050454.GC91748@server.rulingia.com> (raw)
In-Reply-To: <F1BC14F5-0E4A-4A18-914D-BB273753912B@pobox.com>
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On 2018-Jun-20 08:55:05 +1000, David Arnold <davida@pobox.com> wrote:
>Does the screen count as I/O?
I was thinking about that as well. 1080p30 video is around 2MBps as H.264 or
about 140MBps as 6bpp raw. The former is negligible, the latter is still shy
of the disparity in CPU power, especially if you take into account the GPU
power needed to do the decoding.
>I’d suggest that it’s just that the balance is (intentionally) quite different. If you squint right, a GPU could look like a channelized I/O controller.
I agree. Even back then, there was a difference between commercial-oriented
mainframes (the 1401 and 360/50 lineage - which stressed lots of I/O) and the
scientific mainframes (709x, 360/85 - which stressed arithmetic capabilities).
One, not too inaccurate, description of the BCM2835 (RPi SoC) is that it's a
GPU and the sole job of the CPU is to push data into the GPU.
--
Peter Jeremy
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next prev parent reply other threads:[~2018-06-20 5:05 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-15 15:25 Noel Chiappa
2018-06-15 23:05 ` Dave Horsfall
2018-06-15 23:22 ` Lyndon Nerenberg
2018-06-16 6:36 ` Dave Horsfall
2018-06-16 19:07 ` Clem Cole
2018-06-18 9:25 ` Tim Bradshaw
2018-06-19 20:45 ` Peter Jeremy
2018-06-19 22:55 ` David Arnold
2018-06-20 5:04 ` Peter Jeremy [this message]
2018-06-20 5:41 ` Warner Losh
2018-06-20 8:10 ` [TUHS] Old mainframe I/O speed (was: core) Greg 'groggy' Lehey
2018-06-20 16:33 ` Paul Winalski
2018-06-21 3:05 ` Peter Jeremy
2018-06-21 14:00 ` Paul Winalski
2018-06-21 14:49 ` Arrigo Triulzi
2018-06-21 20:39 ` Paul Winalski
2018-06-22 5:32 ` Erik E. Fair
2018-06-22 13:32 ` Clem Cole
2018-06-23 6:08 ` Dave Horsfall
2018-06-23 17:02 ` ron minnich
-- strict thread matches above, loose matches on Subject: below --
2018-06-21 22:44 [TUHS] core Nelson H. F. Beebe
2018-06-21 23:07 ` Grant Taylor via TUHS
2018-06-21 23:38 ` Toby Thain
2018-06-21 17:40 Noel Chiappa
2018-06-21 17:07 Nelson H. F. Beebe
2018-06-21 13:46 Doug McIlroy
2018-06-21 16:13 ` Tim Bradshaw
2018-06-20 20:11 Doug McIlroy
2018-06-20 23:53 ` Tim Bradshaw
2018-06-19 12:23 Noel Chiappa
2018-06-19 12:58 ` Clem Cole
2018-06-19 13:53 ` John P. Linderman
2018-06-21 14:09 ` Paul Winalski
2018-06-19 11:50 Doug McIlroy
[not found] <20180618121738.98BD118C087@mercury.lcs.mit.edu>
2018-06-18 21:13 ` Johnny Billquist
2018-06-18 17:56 Noel Chiappa
2018-06-18 18:51 ` Clem Cole
2018-06-18 14:51 Noel Chiappa
2018-06-18 14:58 ` Warner Losh
[not found] <mailman.1.1529287201.13697.tuhs@minnie.tuhs.org>
2018-06-18 5:58 ` Johnny Billquist
2018-06-18 12:39 ` Ronald Natalie
2018-06-17 21:18 Noel Chiappa
2018-06-17 17:58 Noel Chiappa
2018-06-18 9:16 ` Tim Bradshaw
2018-06-18 15:33 ` Tim Bradshaw
2018-06-17 14:36 Noel Chiappa
2018-06-17 15:58 ` Derek Fawcus
2018-06-16 22:57 Noel Chiappa
[not found] <mailman.1.1529175600.3826.tuhs@minnie.tuhs.org>
2018-06-16 22:14 ` Johnny Billquist
2018-06-16 22:38 ` Arthur Krewat
2018-06-17 0:15 ` Clem cole
2018-06-17 1:50 ` Johnny Billquist
2018-06-17 10:33 ` Ronald Natalie
2018-06-20 16:55 ` Paul Winalski
2018-06-20 21:35 ` Johnny Billquist
2018-06-20 22:24 ` Paul Winalski
2018-06-16 13:49 Noel Chiappa
2018-06-16 14:10 ` Clem Cole
2018-06-16 14:34 ` Lawrence Stewart
2018-06-16 15:28 ` Larry McVoy
2018-06-16 14:10 ` Steve Nickolas
2018-06-16 14:13 ` William Pechter
2018-06-16 13:37 Noel Chiappa
2018-06-16 18:59 ` Clem Cole
2018-06-17 12:15 ` Derek Fawcus
2018-06-17 17:33 ` Theodore Y. Ts'o
2018-06-17 19:50 ` Jon Forrest
2018-06-18 14:56 ` Clem Cole
2018-06-18 12:36 ` Tony Finch
2018-06-16 12:58 Doug McIlroy
2018-06-20 11:10 ` Dave Horsfall
2018-06-16 12:51 Noel Chiappa
2018-06-16 13:11 ` Clem cole
2018-06-15 11:19 A. P. Garcia
2018-06-15 13:50 ` Steffen Nurpmeso
2018-06-15 14:21 ` Clem Cole
2018-06-15 15:11 ` John P. Linderman
2018-06-15 15:21 ` Larry McVoy
2018-06-16 1:08 ` Greg 'groggy' Lehey
2018-06-16 2:00 ` Nemo Nusquam
2018-06-16 2:17 ` John P. Linderman
2018-06-16 3:06 ` Clem cole
2018-06-20 10:06 ` Dave Horsfall
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