Re: Memory ordering

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Sujet : Re: Memory ordering
De : chris.m.thomasson.1 (at) *nospam* gmail.com (Chris M. Thomasson)
Groupes : comp.arch
Date : 15. Nov 2024, 21:42:15
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vh8bn7$3j6ql$1@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11
User-Agent : Mozilla Thunderbird
On 11/15/2024 5:24 AM, Michael S wrote:
On Fri, 15 Nov 2024 03:17:22 -0800
"Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> wrote:
 
On 11/14/2024 11:25 PM, Anton Ertl wrote:
aph@littlepinkcloud.invalid writes:
Yes. That Alpha behaviour was a historic error. No one wants to do
that again.
>
Was it an actual behaviour of any Alpha for public sale, or was it
just the Alpha specification?  I certainly think that Alpha's lack
of guarantees in memory ordering is a bad idea, and so is ARM's:
"It's only 32 pages" <YfxXO.384093$EEm7.56154@fx16.iad>.  Seriously?
Sequential consistency can be specified in one sentence: "The result
of any execution is the same as if the operations of all the
processors were executed in some sequential order, and the
operations of each individual processor appear in this sequence in
the order specified by its program."
[...]
>
>
Well, iirc, the Alpha is the only system that requires an explicit
membar for a RCU based algorithm. Even SPARC in RMO mode does not
need this. Iirc, akin to memory_order_consume in C++:
>
https://en.cppreference.com/w/cpp/atomic/memory_order
>
data dependent loads
>
 You response does not answer Anton's question.
 
I guess not. Shit happens. ;^o

Date Sujet#  Auteur
28 Oct 24 * Arm ldaxr / stxr loop question135jseigh
31 Oct 24 +- Re: Arm ldaxr / stxr loop question1MitchAlsup1
31 Oct 24 +- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
1 Nov 24 +* Re: Arm ldaxr / stxr loop question123aph
2 Nov 24 i`* Re: Arm ldaxr / stxr loop question122Chris M. Thomasson
8 Nov 24 i `* Re: Arm ldaxr / stxr loop question121Chris M. Thomasson
9 Nov 24 i  `* Re: Arm ldaxr / stxr loop question120Chris M. Thomasson
9 Nov 24 i   +* Re: Arm ldaxr / stxr loop question117Chris M. Thomasson
9 Nov 24 i   i+- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
11 Nov 24 i   i+* Re: Arm ldaxr / stxr loop question5MitchAlsup1
11 Nov 24 i   ii+- Re: Arm ldaxr / stxr loop question1Michael S
11 Nov 24 i   ii`* Re: Arm ldaxr / stxr loop question3jseigh
11 Nov 24 i   ii `* Re: Arm ldaxr / stxr loop question2Chris M. Thomasson
13 Nov 24 i   ii  `- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
11 Nov 24 i   i+- Re: Arm ldaxr / stxr loop question1Michael S
12 Nov 24 i   i+- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
12 Nov 24 i   i+* Re: Arm ldaxr / stxr loop question22aph
13 Nov 24 i   ii+* Re: Arm ldaxr / stxr loop question18Chris M. Thomasson
13 Nov 24 i   iii`* Re: Arm ldaxr / stxr loop question17aph
13 Nov 24 i   iii +* Re: Arm ldaxr / stxr loop question3jseigh
13 Nov 24 i   iii i`* Re: Arm ldaxr / stxr loop question2aph
13 Nov 24 i   iii i `- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
13 Nov 24 i   iii +- Re: Arm ldaxr / stxr loop question1MitchAlsup1
13 Nov 24 i   iii +* Re: Arm ldaxr / stxr loop question2Chris M. Thomasson
13 Nov 24 i   iii i`- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
13 Nov 24 i   iii +* Re: Arm ldaxr / stxr loop question2Chris M. Thomasson
13 Nov 24 i   iii i`- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
13 Nov 24 i   iii `* Re: Arm ldaxr / stxr loop question8Terje Mathisen
13 Nov 24 i   iii  +* Brilliance (was: Arm ldaxr / stxr loop question)4Anton Ertl
13 Nov 24 i   iii  i+- Re: Brilliance1BGB
14 Nov 24 i   iii  i`* Re: Brilliance2Terje Mathisen
17 Nov 24 i   iii  i `- Re: Brilliance1Thomas Koenig
13 Nov 24 i   iii  `* Re: Arm ldaxr / stxr loop question3aph
14 Nov 24 i   iii   `* Re: Arm ldaxr / stxr loop question2Terje Mathisen
15 Nov 24 i   iii    `- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
13 Nov 24 i   ii`* Re: Arm ldaxr / stxr loop question3BGB
13 Nov 24 i   ii `* Re: Arm ldaxr / stxr loop question2Chris M. Thomasson
13 Nov 24 i   ii  `- Re: Arm ldaxr / stxr loop question1Robert Finch
14 Nov 24 i   i`* Re: Arm ldaxr / stxr loop question86Kent Dickey
14 Nov 24 i   i `* Re: Arm ldaxr / stxr loop question85aph
15 Nov 24 i   i  +* Re: Arm ldaxr / stxr loop question81Chris M. Thomasson
15 Nov 24 i   i  i`* Re: Arm ldaxr / stxr loop question80aph
15 Nov 24 i   i  i +- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
15 Nov 24 i   i  i `* Memory ordering (was: Arm ldaxr / stxr loop question)78Anton Ertl
15 Nov 24 i   i  i  +* Re: Memory ordering44Chris M. Thomasson
15 Nov 24 i   i  i  i`* Re: Memory ordering43Michael S
15 Nov 24 i   i  i  i `* Re: Memory ordering42Chris M. Thomasson
16 Nov 24 i   i  i  i  `* Re: Memory ordering41Chris M. Thomasson
16 Nov 24 i   i  i  i   +- Re: Memory ordering1Chris M. Thomasson
17 Nov 24 i   i  i  i   `* Re: Memory ordering39jseigh
17 Nov 24 i   i  i  i    +* Re: Memory ordering33Anton Ertl
19 Nov 24 i   i  i  i    i`* Re: Memory ordering32Chris M. Thomasson
3 Dec 24 i   i  i  i    i `* Re: Memory ordering31Anton Ertl
3 Dec 24 i   i  i  i    i  `* Re: Memory ordering30jseigh
3 Dec 24 i   i  i  i    i   `* Re: Memory ordering29MitchAlsup1
4 Dec 24 i   i  i  i    i    +* Re: Memory ordering22Stefan Monnier
4 Dec 24 i   i  i  i    i    i+* Re: Memory ordering3MitchAlsup1
4 Dec 24 i   i  i  i    i    ii`* Re: Memory ordering2Stefan Monnier
4 Dec 24 i   i  i  i    i    ii `- Re: Memory ordering1MitchAlsup1
4 Dec 24 i   i  i  i    i    i`* Re: Memory ordering18jseigh
5 Dec 24 i   i  i  i    i    i `* Re: Memory ordering17Chris M. Thomasson
5 Dec 24 i   i  i  i    i    i  +* Re: Memory ordering8jseigh
16 Dec22:48 i   i  i  i    i    i  i`* Re: Memory ordering7Chris M. Thomasson
17 Dec13:33 i   i  i  i    i    i  i `* Re: Memory ordering6jseigh
17 Dec21:38 i   i  i  i    i    i  i  +- Re: Memory ordering1aph
17 Dec21:41 i   i  i  i    i    i  i  `* Re: Memory ordering4Chris M. Thomasson
17 Dec22:45 i   i  i  i    i    i  i   +- Re: Memory ordering1MitchAlsup1
18 Dec12:43 i   i  i  i    i    i  i   `* Re: Memory ordering2jseigh
19 Dec03:48 i   i  i  i    i    i  i    `- Re: Memory ordering1Chris M. Thomasson
19 Dec19:33 i   i  i  i    i    i  `* Re: Memory ordering8MitchAlsup1
19 Dec22:19 i   i  i  i    i    i   `* Re: Memory ordering7Chris M. Thomasson
20 Dec00:59 i   i  i  i    i    i    +* Re: Memory ordering5MitchAlsup1
20 Dec01:21 i   i  i  i    i    i    i+* Re: Memory ordering2Chris M. Thomasson
20 Dec01:25 i   i  i  i    i    i    ii`- Re: Memory ordering1Chris M. Thomasson
20 Dec01:48 i   i  i  i    i    i    i`* Re: Memory ordering2Chris M. Thomasson
20 Dec01:58 i   i  i  i    i    i    i `- Re: Memory ordering1Chris M. Thomasson
20 Dec21:17 i   i  i  i    i    i    `- Re: Memory ordering1Chris M. Thomasson
4 Dec 24 i   i  i  i    i    +- Re: Memory ordering1Chris M. Thomasson
4 Dec 24 i   i  i  i    i    +- Re: Memory ordering1MitchAlsup1
5 Dec 24 i   i  i  i    i    `* Re: Memory ordering4Tim Rentsch
6 Dec 24 i   i  i  i    i     +* Re: Memory ordering2Terje Mathisen
6 Dec 24 i   i  i  i    i     i`- Re: Memory ordering1Tim Rentsch
20 Dec06:08 i   i  i  i    i     `- Re: Memory ordering1Chris M. Thomasson
17 Nov 24 i   i  i  i    +* Re: Memory ordering2Chris M. Thomasson
19 Nov 24 i   i  i  i    i`- Re: Memory ordering1Chris M. Thomasson
18 Nov 24 i   i  i  i    +- Re: Memory ordering1aph
21 Nov 24 i   i  i  i    +- Re: Memory ordering1Chris M. Thomasson
21 Nov 24 i   i  i  i    `- Re: Memory ordering1Chris M. Thomasson
15 Nov 24 i   i  i  +* Re: Memory ordering (was: Arm ldaxr / stxr loop question)2Michael S
15 Nov 24 i   i  i  i`- Re: Memory ordering (was: Arm ldaxr / stxr loop question)1Anton Ertl
15 Nov 24 i   i  i  +* Re: Memory ordering28jseigh
15 Nov 24 i   i  i  i`* Re: Memory ordering27Anton Ertl
15 Nov 24 i   i  i  i +* Re: Memory ordering18Chris M. Thomasson
16 Nov 24 i   i  i  i i`* Re: Memory ordering17Anton Ertl
17 Nov 24 i   i  i  i i `* Re: Memory ordering16Chris M. Thomasson
17 Nov 24 i   i  i  i i  `* Re: Memory ordering15Anton Ertl
18 Nov 24 i   i  i  i i   `* Re: Memory ordering14Chris M. Thomasson
18 Nov 24 i   i  i  i i    `* Re: Memory ordering13Anton Ertl
19 Nov 24 i   i  i  i i     `* Re: Memory ordering12Chris M. Thomasson
19 Nov 24 i   i  i  i i      `* Re: Memory ordering11Chris M. Thomasson
26 Nov 24 i   i  i  i i       +* Re: Memory ordering4Chris M. Thomasson
3 Dec 24 i   i  i  i i       `* Re: Memory ordering6Anton Ertl
15 Nov 24 i   i  i  i +* Re: Memory ordering7BGB
17 Nov 24 i   i  i  i `- Re: Memory ordering1Tim Rentsch
16 Nov 24 i   i  i  +- Re: Memory ordering (was: Arm ldaxr / stxr loop question)1Anton Ertl
16 Nov 24 i   i  i  +- Re: Memory ordering (was: Arm ldaxr / stxr loop question)1Lawrence D'Oliveiro
18 Nov 24 i   i  i  `- Re: Memory ordering1aph
21 Nov 24 i   i  `* Re: Arm ldaxr / stxr loop question3Kent Dickey
9 Nov 24 i   `* Re: Arm ldaxr / stxr loop question2jseigh
8 Nov 24 +* Re: Arm ldaxr / stxr loop question8Lawrence D'Oliveiro
20 Dec10:11 `- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson

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