| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Alexey Klyukin <alexk(at)commandprompt(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Estimating total amount of shared memory required by postmaster |
| Date: | 2011-06-03 04:15:49 |
| Message-ID: | 1307074462-sup-635@alvh.no-ip.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Excerpts from Tom Lane's message of jue jun 02 15:49:53 -0400 2011:
> The results of such a test wouldn't be worth the electrons they're
> written on anyway: you're ignoring the likelihood that two instances of
> shared memory would overrun the kernel's SHMALL limit, when a single
> instance would be fine.
Well, overrunning SHMALL sets a different errno than overrunning SHMMAX,
so at least it's possible to notice the problem.
> Given that you can't do it in the context of a live installation, just
> trying to start the postmaster and seeing if it works (same as initdb
> does) seems as good as anything else.
That's precisely what this is trying to avoid.
--
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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