From: Justin Pryzby <pryzby@telsasoft.com>
To: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Cc: pgsql-hackers@lists.postgresql.org, Alvaro Herrera <alvherre@alvh.no-ip.org>
Subject: Re: What are exactly bootstrap processes, auxiliary processes, standalone backends, normal backends(user sessions)?
Date: Thu, 15 Jul 2021 09:47:37 -0500
Message-ID: <20210715144737.GG20208@telsasoft.com> (raw)
In-Reply-To: <CALj2ACVpYCT0M+k8zqrAa4ZQZV+ce5s6G=yajwoS1m=h-jj8NQ@mail.gmail.com>
References: <CALj2ACVpYCT0M+k8zqrAa4ZQZV+ce5s6G=yajwoS1m=h-jj8NQ@mail.gmail.com>
On Fri, Jul 09, 2021 at 09:24:19PM +0530, Bharath Rupireddy wrote:
> I've always had a hard time distinguishing various types of
> processes/terms used in postgres. I look at the source code every time
> to understand them, yet I don't feel satisfied with my understanding.
> I request any hacker (having a better idea than me) to help me with
> what each different process does and how they are different from each
> other? Of course, I'm clear with normal backends (user sessions), bg
> workers, but the others need a bit more understanding.
It sounds like something that should be in the glossary, which currently refers
to but doesn't define "auxiliary processes".
* Background writer, checkpointer, WAL writer and archiver run during normal
* operation. Startup process and WAL receiver also consume 2 slots, but WAL
* writer is launched only after startup has exited, so we only need 5 slots.
*/
#define NUM_AUXILIARY_PROCS 5
Bootstrap is run by initdb:
src/bin/initdb/initdb.c: "\"%s\" --boot -x0 %s %s "
Standalone backend is run by --single, right ?
--
Justin
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To: pgsql-hackers@postgresql.org
Cc: pryzby@telsasoft.com, bharath.rupireddyforpostgres@gmail.com, alvherre@alvh.no-ip.org
Subject: Re: What are exactly bootstrap processes, auxiliary processes, standalone backends, normal backends(user sessions)?
In-Reply-To: <20210715144737.GG20208@telsasoft.com>
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