Re: Making Lemonade (Floating-point format changes)

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Sujet : Re: Making Lemonade (Floating-point format changes)
De : gneuner2 (at) *nospam* comcast.net (George Neuner)
Groupes : comp.arch
Date : 26. May 2024, 21:51:31
Autres entêtes
Organisation : i2pn2 (i2pn.org)
Message-ID : <eg675jp3q4uvnjtuei6eno0dirn9jb1hp6@4ax.com>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14
User-Agent : ForteAgent/8.00.32.1272
On Fri, 24 May 2024 09:43:19 -0400, EricP
<ThatWouldBeTelling@thevillage.com> wrote:

Chris M. Thomasson wrote:
On 5/20/2024 8:44 AM, EricP wrote:

Thanks. I have never used the thread-per-client model in my servers.
I have been using async I/O and Asynchronous Procedure Calls (APC)
for I/O completion on Windows for 30+ years. IO Completion Ports (IOCP),
which were added to Windows later, have similar functionality
(perhaps IOCP might have slightly better scaling with many cores).
 
I never tried APC wrt IO and a socket server on windows before! I have
created several types wrt the book I finally found on the wayback
machine. IOCP was the thing to use.
>
APC's are I/O completion callback subroutines with 1 to 3 arguments.
I use them to a build callback driven state machines for each network
I/O channel, similar to device drivers. Each network channel requires
only a small amount of user mode memory, and all server network connections
can be serviced by a single thread or a small fixed pool of comms threads.
This keeps the cost for each new connection to mostly just the kernel's
network memory.
>
WinNT originally only had APC's. It inherited the concept from
VMS's Asynchronous System Trap (AST), which inherited the concept
from RSX-11 on PDP-11.

I can't speak to "originally" as I never used NT3.x, but NT4.x allowed
asynchronous I/O calls to signal events on completion (or failure).  I
used events with WaitForMultipleObjects [*] to mix file and socket
operations in single-thread servers.

[*] like select() or poll() in Unix.  For a long time the Windows
"WaitFor..." calls could NOT directly monitor sockets (sockets were
not files), but they could could monitor user events, and both the
file and socket APIs supported using completion events.


APCs might have been more efficient, but I only ever used them in
conjunction with threads - I never tried to write a single-thread
server that performed operations on multiple files or sockets using
only APC.


The difference between Windows APC and RSX/VMS AST is how they are delivered.
Despite the name, Windows user mode APC's are NOT delivered to the thread
asynchronously as interrupts but only at specified delivery points,
which means user mode APC's are essentially a synchronous polled delivery.
whereas VMS AST's are delivered at any time using interrupts semantics.
(Windows does have real asynchronous-delivery APC's but inside the kernel
where they are used to interrupt or wake up a thread for I/O completion
and various other things.)

User mode APC's are simpler from a user mode programming point of view than
VMS's AST's but because APC's have a polled delivery you can't use user mode
APC's to interrupt and force a thread to do something, as AST's can.

Date Sujet#  Auteur
12 May 24 * Making Lemonade (Floating-point format changes)101John Savard
12 May 24 +* Re: Making Lemonade (Floating-point format changes)3wolfgang kern
15 May 24 i`* Re: Making Lemonade (Floating-point format changes)2Michael S
15 May 24 i `- Re: Making Lemonade (Floating-point format changes)1BGB
12 May 24 +* Re: Making Lemonade (Floating-point format changes)6Thomas Koenig
12 May 24 i`* Re: Making Lemonade (Floating-point format changes)5John Savard
12 May 24 i +- Re: Making Lemonade (Floating-point format changes)1John Savard
12 May 24 i `* Re: Making Lemonade (Floating-point format changes)3MitchAlsup1
13 May 24 i  `* Re: Making Lemonade (Floating-point format changes)2John Savard
13 May 24 i   `- Re: Making Lemonade (Floating-point format changes)1BGB
12 May 24 `* Re: Making Lemonade (Floating-point format changes)91John Dallman
12 May 24  `* Re: Making Lemonade (Floating-point format changes)90Thomas Koenig
13 May 24   `* Re: Making Lemonade (Floating-point format changes)89Michael S
13 May 24    +* Re: Making Lemonade (Floating-point format changes)56Thomas Koenig
14 May 24    i`* Re: Making Lemonade (Floating-point format changes)55Michael S
15 May 24    i `* Re: Making Lemonade (Floating-point format changes)54Thomas Koenig
15 May 24    i  `* Re: Making Lemonade (Floating-point format changes)53Michael S
19 May 24    i   `* Re: Making Lemonade (Floating-point format changes)52Thomas Koenig
19 May 24    i    +* Re: Making Lemonade (Floating-point format changes)3Michael S
19 May 24    i    i+- Re: Making Lemonade (Floating-point format changes)1MitchAlsup1
20 May 24    i    i`- Re: Making Lemonade (Floating-point format changes)1Thomas Koenig
19 May 24    i    `* Re: Making Lemonade (Floating-point format changes)48Terje Mathisen
19 May 24    i     +* Re: Making Lemonade (Floating-point format changes)40Michael S
19 May 24    i     i+- Re: Making Lemonade (Floating-point format changes)1MitchAlsup1
20 May 24    i     i+* Re: Making Lemonade (Floating-point format changes)30Terje Mathisen
20 May 24    i     ii`* Re: Making Lemonade (Floating-point format changes)29Michael S
20 May 24    i     ii `* Re: Making Lemonade (Floating-point format changes)28Terje Mathisen
20 May 24    i     ii  `* Re: Making Lemonade (Floating-point format changes)27Michael S
20 May 24    i     ii   +* Re: Making Lemonade (Floating-point format changes)19BGB
20 May 24    i     ii   i`* Re: Making Lemonade (Floating-point format changes)18MitchAlsup1
20 May 24    i     ii   i +- Re: Making Lemonade (Floating-point format changes)1Chris M. Thomasson
20 May 24    i     ii   i +- Re: Making Lemonade (Floating-point format changes)1Thomas Koenig
21 May 24    i     ii   i `* Re: Making Lemonade (Floating-point format changes)15BGB
21 May 24    i     ii   i  +* Re: Making Lemonade (Floating-point format changes)12Thomas Koenig
21 May 24    i     ii   i  i+* Re: Making Lemonade (Floating-point format changes)7Michael S
21 May 24    i     ii   i  ii+* Re: Making Lemonade (Floating-point format changes)5Terje Mathisen
21 May 24    i     ii   i  iii+- Re: Making Lemonade (Floating-point format changes)1Michael S
21 May 24    i     ii   i  iii`* Re: Making Lemonade (Floating-point format changes)3BGB
22 May 24    i     ii   i  iii `* Re: Making Lemonade (Floating-point format changes)2MitchAlsup1
22 May 24    i     ii   i  iii  `- Re: Making Lemonade (Floating-point format changes)1BGB-Alt
21 May 24    i     ii   i  ii`- Re: Making Lemonade (Floating-point format changes)1Thomas Koenig
21 May 24    i     ii   i  i`* Re: Making Lemonade (Floating-point format changes)4BGB
21 May 24    i     ii   i  i `* Re: Making Lemonade (Floating-point format changes)3MitchAlsup1
21 May 24    i     ii   i  i  +- Re: Making Lemonade (Floating-point format changes)1BGB
22 May 24    i     ii   i  i  `- Re: Making Lemonade (Floating-point format changes)1Terje Mathisen
21 May 24    i     ii   i  `* Re: Making Lemonade (Floating-point format changes)2MitchAlsup1
21 May 24    i     ii   i   `- Re: Making Lemonade (Floating-point format changes)1BGB
20 May 24    i     ii   `* Re: Making Lemonade (Floating-point format changes)7Terje Mathisen
21 May 24    i     ii    `* Re: Making Lemonade (Floating-point format changes)6Michael S
21 May 24    i     ii     `* Re: Making Lemonade (Floating-point format changes)5MitchAlsup1
21 May 24    i     ii      +* Re: Making Lemonade (Floating-point format changes)2Stefan Monnier
22 May 24    i     ii      i`- Re: Making Lemonade (Floating-point format changes)1MitchAlsup1
22 May 24    i     ii      +- Re: Making Lemonade (Floating-point format changes)1Terje Mathisen
22 May 24    i     ii      `- Re: Making Lemonade (Floating-point format changes)1MitchAlsup1
20 May 24    i     i`* binary128 implementation (was: Making Lemonade (Floating-point format changes)8Anton Ertl
20 May 24    i     i `* Re: binary128 implementation7Terje Mathisen
23 May 24    i     i  `* Re: binary128 implementation6BGB-Alt
23 May 24    i     i   `* Re: binary128 implementation5MitchAlsup1
24 May 24    i     i    `* Re: binary128 implementation4Terje Mathisen
24 May 24    i     i     `* Re: binary128 implementation3BGB-Alt
25 May 24    i     i      `* Re: binary128 implementation2MitchAlsup1
25 May 24    i     i       `- Re: binary128 implementation1BGB
19 May 24    i     +* Re: Making Lemonade (Floating-point format changes)6BGB
19 May 24    i     i`* Re: Making Lemonade (Floating-point format changes)5MitchAlsup1
20 May 24    i     i `* Re: Making Lemonade (Floating-point format changes)4BGB
20 May 24    i     i  `* Re: Making Lemonade (Floating-point format changes)3MitchAlsup1
20 May 24    i     i   `* Re: Making Lemonade (Floating-point format changes)2BGB
20 May 24    i     i    `- Re: Making Lemonade (Floating-point format changes)1MitchAlsup1
19 May 24    i     `- Re: Making Lemonade (Floating-point format changes)1MitchAlsup1
13 May 24    `* Re: Making Lemonade (Floating-point format changes)32BGB
13 May 24     `* Re: Making Lemonade (Floating-point format changes)31MitchAlsup1
14 May 24      +* Re: Making Lemonade (Floating-point format changes)22BGB
14 May 24      i`* Re: Making Lemonade (Floating-point format changes)21MitchAlsup1
14 May 24      i `* Re: Making Lemonade (Floating-point format changes)20BGB
14 May 24      i  `* Re: Making Lemonade (Floating-point format changes)19MitchAlsup1
14 May 24      i   +* Re: Making Lemonade (Floating-point format changes)2Michael S
15 May 24      i   i`- Re: Making Lemonade (Floating-point format changes)1Michael S
14 May 24      i   +- Re: Making Lemonade (Floating-point format changes)1BGB
16 May 24      i   `* Re: Making Lemonade (Floating-point format changes)15MitchAlsup1
17 May 24      i    `* Re: Making Lemonade (Floating-point format changes)14MitchAlsup1
17 May 24      i     +* Re: Making Lemonade (Floating-point format changes)2MitchAlsup1
18 May 24      i     i`- Re: Making Lemonade (Floating-point format changes)1MitchAlsup1
18 May 24      i     `* Re: Making Lemonade (Floating-point format changes)11Chris M. Thomasson
19 May 24      i      `* Re: Making Lemonade (Floating-point format changes)10Chris M. Thomasson
19 May 24      i       `* Re: Making Lemonade (Floating-point format changes)9Chris M. Thomasson
19 May 24      i        `* Re: Making Lemonade (Floating-point format changes)8Chris M. Thomasson
20 May 24      i         `* Re: Making Lemonade (Floating-point format changes)7Chris M. Thomasson
20 May 24      i          `* Re: Making Lemonade (Floating-point format changes)6Chris M. Thomasson
20 May 24      i           `* Re: Making Lemonade (Floating-point format changes)5Chris M. Thomasson
24 May 24      i            `* Re: Making Lemonade (Floating-point format changes)4Chris M. Thomasson
26 May 24      i             `* Re: Making Lemonade (Floating-point format changes)3George Neuner
27 May 24      i              +- Re: Making Lemonade (Floating-point format changes)1Chris M. Thomasson
1 Jun 24      i              `- Re: Making Lemonade (Floating-point format changes)1Chris M. Thomasson
14 May 24      +* Re: Making Lemonade (Floating-point format changes)4Anton Ertl
14 May 24      i`* Re: Making Lemonade (Floating-point format changes)3MitchAlsup1
14 May 24      i +- Re: Making Lemonade (Floating-point format changes)1MitchAlsup1
14 May 24      i `- Re: Making Lemonade (Floating-point format changes)1BGB
10 Jun 24      `* Re: Making Lemonade (Floating-point format changes)4Lawrence D'Oliveiro
10 Jun 24       `* Re: Making Lemonade (Floating-point format changes)3Terje Mathisen
10 Jun 24        `* Re: Making Lemonade (Floating-point format changes)2Niklas Holsti
11 Jun 24         `- Re: Making Lemonade (Floating-point format changes)1Lawrence D'Oliveiro

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