Hi,
FYI, people interested in this thread might be interested in
pgsql-bugs #18610. There are two related issues here:
1. Some people want to use LSE on modern ARM servers so they want to
use -moutline-atomics, which IIUC adds auto-detection logic with
fallback code so it can still run on the f
Hi!
On Mon, Sep 7, 2020 at 1:12 AM Zidenberg, Tsahi wrote:
> First, I apologize for taking so long to answer. This e-mail regretfully got
> lost in my inbox.
>
> On 24/07/2020, 4:17, "Andres Freund" wrote:
>
> > What does "not significantly affected" exactly mean? Could you post the
>
"Zidenberg, Tsahi" writes:
> On 29/09/2020, 10:21, "Heikki Linnakangas" wrote:
>> If it's a good idea to use -moutline-atomics, I would expect the
>> compiler or distribution to enable it by default. And as you pointed
>> out, many have.
> -moutline-atomics is only enabled by defaul
On 30/09/2020 19:04, Zidenberg, Tsahi wrote:
Ubuntu 20.04 even turned it off by default for gcc-10, which seems
like a compatibility step with the main gcc-9 compiler.
Ok, I definitely don't want to override that decision.
I'm marking this as Rejected in the commitfest. But thanks for the
benc
On 29/09/2020, 10:21, "Heikki Linnakangas" wrote:
> If it's a good idea to use -moutline-atomics, I would expect the
> compiler or distribution to enable it by default. And as you pointed
> out, many have.
-moutline-atomics is only enabled by default on the gcc-10 branch where
it w
On 10/09/2020 09:37, Zidenberg, Tsahi wrote:
On 08/09/2020, 1:01, "Tom Lane" wrote:
> I wonder what version of gcc you intend this for. AFAICS, older
> gcc versions lack this flag at all, while newer ones have it on
> by default.
(previously sent private reply, sorry)
The mou
On 08/09/2020, 1:01, "Tom Lane" wrote:
> I wonder what version of gcc you intend this for. AFAICS, older
> gcc versions lack this flag at all, while newer ones have it on
> by default.
(previously sent private reply, sorry)
The moutline-atomics flag showed substantial enough impro
"Zidenberg, Tsahi" writes:
> Outline-atomics is a gcc compilation flag that adds runtime detection of
> weather or not the cpu supports atomic instructions. CPUs that don't support
> atomic instructions will use the old load-exclusive/store-exclusive
> instructions. If a different compilation f
On Sun, Sep 06, 2020 at 09:00:02PM +, Zidenberg, Tsahi wrote:
> These results show only about 6% performance increase in simple-update, and
> very close
> performance in other results, most of which could be attributed to benchmark
> result jitter.
> These results from "well behaved" benchmar
Hello!
First, I apologize for taking so long to answer. This e-mail regretfully got
lost in my inbox.
On 24/07/2020, 4:17, "Andres Freund" wrote:
> What does "not significantly affected" exactly mean? Could you post the
> raw numbers?
The following tests show benchmark behavior on m6
Hi,
On 2020-07-01 15:40:38 +, Zidenberg, Tsahi wrote:
> Outline-atomics is a gcc compilation flag that adds runtime detection
> of weather or not the cpu supports atomic instructions. CPUs that
> don't support atomic instructions will use the old
> load-exclusive/store-exclusive instructions.
On 01/07/2020, 18:40, "Zidenberg, Tsahi" wrote:
> Outline-atomics is a gcc compilation flag that adds runtime detection of
> weather or not the cpu
> supports atomic instructions. CPUs that don't support atomic instructions
> will use the old
> load-exclusive/store-exclusive instructions. If a
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