Who has any documentation about the PostgreSQL background process?

Does anyone have any documentation about the PostgreSQL background process?

I want to learn more about these background processes:

> postgres: recorder process
> postgres: writer process
> postgres: Walmart writer
> postgres: autovacuum startup program
> postgres: archiving process
> postgres: statistics collection program

A quick Internet search found these files, and I found the first one very interesting:

> http://raghavt.blogspot.com/2011/04 /postgresql-90-architecture.html
> http://cisc322.files.wordpress.com/2010/10/conceptual_architecture_of_postgresql.pdf
> http://vibhork.blogspot.com/2011/04/postgresqlpostgres -plus-advanced-server.html
> http://www.interdb.jp/pg/pgsql02.html
> https://www.slideshare.net/EnterpriseDB/overviewutilityprocesses-finalaug222013

Who has any documentation on PostgreSQL background processes?

I want to learn more about these background processes:

> postgres: recorder process
> postgres: writer process
> postgres: Walmart writer
> postgres: autovacuum startup program
> postgres: archiving process
> postgres: statistics collection program

a quick Internet search found these files, I found the first one very interesting:

> http://raghavt.blogspot.com/2011/04/postgresql-90-architecture.html
> http://cisc322.files.wordpress.com/2010/10/conceptual_architecture_of_postgresql.pdf
> http://vibhork.blogspot.com/2011/04/postgresqlpostgres-plus-advanced-server.html
> http://www.interdb.jp/pg/pgsql02.html
> https://www.slideshare.net/EnterpriseDB/overviewutilityprocesses-finalaug222013

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