| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Greg Stark <stark(at)mit(dot)edu> |
| Cc: | Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Let's make PostgreSQL multi-threaded |
| Date: | 2023-06-08 15:54:01 |
| Message-ID: | 20230608155401.f4bi2e3ravbffwu3@awork3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2023-06-08 10:33:26 -0400, Greg Stark wrote:
> On Wed, 7 Jun 2023 at 18:09, Andres Freund <andres(at)anarazel(dot)de> wrote:
> > Having the same memory mapping between threads makes allows the
> > hardware to share the TLB (on x86 via process context identifiers), which
> > isn't realistically possible with different processes.
>
> As a matter of historical interest Solaris actually did implement this
> across different processes. It was called by the somewhat unfortunate
> name "Intimate Shared Memory". I don't think Linux ever implemented
> anything like it but I'm not sure.
I don't think it shared the TLB - it did share page tables though.
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