Re: optimize atomic exchanges
От
Nathan Bossart
Тема
Re: optimize atomic exchanges
Дата
Msg-id
20231201043522.GB1577008@nathanxps13
Ответ на
Re: optimize atomic exchanges (Andres Freund)
Список
Дерево обсуждения
optimize atomic exchanges Nathan Bossart <nathandbossart@gmail.com>
Re: optimize atomic exchanges Nathan Bossart <nathandbossart@gmail.com>
Re: optimize atomic exchanges Andres Freund <andres@anarazel.de>
Re: optimize atomic exchanges Nathan Bossart <nathandbossart@gmail.com>
Re: optimize atomic exchanges Nathan Bossart <nathandbossart@gmail.com>
Re: optimize atomic exchanges Nathan Bossart <nathandbossart@gmail.com>
Re: optimize atomic exchanges Andres Freund <andres@anarazel.de>
Re: optimize atomic exchanges Nathan Bossart <nathandbossart@gmail.com>
On Thu, Nov 30, 2023 at 07:56:27PM -0800, Andres Freund wrote: > On 2023-11-30 21:18:15 -0600, Nathan Bossart wrote: >> Some rudimentary tests show a >40% speedup with this patch on x86_64. > > On bigger machines, with contention, the wins are likely much higher. I see > two orders of magnitude higher throughput in a test program that I had around, > on a two socket cascade lake machine. Of course it's also much less > powerfull... Nice. Thanks for trying it out. One thing on my mind is whether we should bother with the inline assembly versions. It looks like gcc has had __atomic since 4.7.0 (2012), so I'm not sure we gain much from them. OTOH they are pretty simple and seem unlikely to cause too much trouble. -- Nathan Bossart Amazon Web Services: https://aws.amazon.com
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