RE: Shared Memory: How to use SYSV rather than MMAP ? - Mailing list pgsql-hackers
| From | REIX, Tony |
|---|---|
| Subject | RE: Shared Memory: How to use SYSV rather than MMAP ? |
| Date | |
| Msg-id | DB7PR02MB4663CD1EE49D97BB8278AE1D868E0@DB7PR02MB4663.eurprd02.prod.outlook.com Whole thread Raw |
| In response to | Re: Shared Memory: How to use SYSV rather than MMAP ? (Thomas Munro <thomas.munro@enterprisedb.com>) |
| Responses |
Re: Shared Memory: How to use SYSV rather than MMAP ?
(Thomas Munro <thomas.munro@enterprisedb.com>)
|
| List | pgsql-hackers |
Hi Thomas,
I'm back from vacations.
Thanks for the 2 patches!
I've seen also the discussion around this subject. Very interesting. Should I wait for a decision been taken? or should I study and experiment your patches before?
I'm now in the process of studying with gprof what Postgres does on AIX compared to Linux/Power, in order to understand where time goes.
Regards,
Cordialement,
Tony Reix
tony.reix@atos.net
ATOS / Bull SAS
ATOS Expert
IBM Coop Architect & Technical Leader
Tony Reix
tony.reix@atos.net
ATOS / Bull SAS
ATOS Expert
IBM Coop Architect & Technical Leader
Office : +33 (0) 4 76 29 72 67
1 rue de Provence - 38432 Échirolles - France
De : Thomas Munro <thomas.munro@enterprisedb.com>
Envoyé : mercredi 26 décembre 2018 00:28:54
À : REIX, Tony
Cc : Andres Freund; Robert Haas; Pg Hackers; EMPEREUR-MOT, SYLVIE
Objet : Re: Shared Memory: How to use SYSV rather than MMAP ?
Envoyé : mercredi 26 décembre 2018 00:28:54
À : REIX, Tony
Cc : Andres Freund; Robert Haas; Pg Hackers; EMPEREUR-MOT, SYLVIE
Objet : Re: Shared Memory: How to use SYSV rather than MMAP ?
On Wed, Dec 19, 2018 at 4:17 AM REIX, Tony <tony.reix@atos.net> wrote:
> Here is the patch we are using now on AIX for enabling SysV shm for AIX, which improves greatly the performance on AIX.
>
> It is compile time.
>
> It seems to me that you'd like this to become a shared_memory_type GUC. Correct? However, I do not know how to do.
>
>
> Even as-is, this patch would greatly improve the performance of PostgreSQL v11.1 in the field on AIX machines. So, we'd like this change to be available for AIX asap.
>
>
> What are the next steps to get this patch accepted? or What are your suggestions for improving it?
Hi Tony,
Since it's not fixing a bug, we wouldn't back-patch that into existing
releases. But I agree that we should do something like this for
PostgreSQL 12, and I think we should make it user configurable.
Here is a quick rebase of Andres's shared_memory_type patch for
master, so that you can put shared_memory_type=sysv in postgresql.conf
to get the old pre-9.3 behaviour (this may also be useful for other
operating systems). Here also is a "blind" patch that makes it
respect huge_pages=try/on on AIX (or at least, I think it does; I
don't have an AIX to try it, it almost certainly needs some
adjustments). Thoughts?
--
Thomas Munro
https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.enterprisedb.com&data=02%7C01%7Ctony.reix%40atos.net%7C554c8fd9266d4fc3674808d66ac0d8cc%7C33440fc6b7c7412cbb730e70b0198d5a%7C0%7C0%7C636813773841365546&sdata=lpXwVIYe5lE2P6lC1fhgqcxsuQG6sVdb5FZ9k3d590U%3D&reserved=0
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> Here is the patch we are using now on AIX for enabling SysV shm for AIX, which improves greatly the performance on AIX.
>
> It is compile time.
>
> It seems to me that you'd like this to become a shared_memory_type GUC. Correct? However, I do not know how to do.
>
>
> Even as-is, this patch would greatly improve the performance of PostgreSQL v11.1 in the field on AIX machines. So, we'd like this change to be available for AIX asap.
>
>
> What are the next steps to get this patch accepted? or What are your suggestions for improving it?
Hi Tony,
Since it's not fixing a bug, we wouldn't back-patch that into existing
releases. But I agree that we should do something like this for
PostgreSQL 12, and I think we should make it user configurable.
Here is a quick rebase of Andres's shared_memory_type patch for
master, so that you can put shared_memory_type=sysv in postgresql.conf
to get the old pre-9.3 behaviour (this may also be useful for other
operating systems). Here also is a "blind" patch that makes it
respect huge_pages=try/on on AIX (or at least, I think it does; I
don't have an AIX to try it, it almost certainly needs some
adjustments). Thoughts?
--
Thomas Munro
https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.enterprisedb.com&data=02%7C01%7Ctony.reix%40atos.net%7C554c8fd9266d4fc3674808d66ac0d8cc%7C33440fc6b7c7412cbb730e70b0198d5a%7C0%7C0%7C636813773841365546&sdata=lpXwVIYe5lE2P6lC1fhgqcxsuQG6sVdb5FZ9k3d590U%3D&reserved=0
ATOS WARNING !
This message contains attachments that could potentially harm your computer.
Please make sure you open ONLY attachments from senders you know, trust and is in an e-mail that you are expecting.
AVERTISSEMENT ATOS !
Ce message contient des pièces jointes qui peuvent potentiellement endommager votre ordinateur.
Merci de vous assurer que vous ouvrez uniquement les pièces jointes provenant d’emails que vous attendez et dont vous connaissez les expéditeurs et leur faites confiance.
AVISO DE ATOS !
Este mensaje contiene datos adjuntos que pudiera ser que dañaran su ordenador.
Asegúrese de abrir SOLO datos adjuntos enviados desde remitentes de confianza y que procedan de un correo esperado.
ATOS WARNUNG !
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Bitte beachten Sie, daß Sie NUR Anlagen öffnen, von einem Absender den Sie kennen, vertrauen und vom dem Sie vor allem auch E-Mails mit Anlagen erwarten.
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