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Updated FSM display for VACUUM VERBOSE

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: PostgreSQL-patches <pgsql-patches(at)postgresql(dot)org>
Subject: Updated FSM display for VACUUM VERBOSE
Date: 2005-04-23 04:23:40
Message-ID: 200504230423.j3N4Ner13480@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-patches
I have trouble understanding the current output of VACUUM VERBOSE when
it displays FSM information.

The current output is:
	
	INFO:  free space map: 49 relations, 17266 pages stored; 18768 total
	pages used
	DETAIL:  FSM size: 1000 relations + 18000 pages = 171 kB shared memory.
	NOTICE:  the number of page slots needed (18768) exceeds max_fsm_pages
	(18000)
	HINT:  Consider increasing the configuration parameter "max_fsm_relations"
	to a value over 18768.

The problem I have is that the relations part is mixed with the pages
part, and the numbers aren't easily comparable.  I have attached a patch
which makes the information easier to understand.  Here is one where the
FSM is large enough:
	
	INFO:  free space map: 48 relations with free space, maximum of 1000 relations trackable
	INFO:  35 pages stored, 768 pages used (with overhead)
	INFO:  768 pages required to store all freespace, maximum of 18000 pages allocatable (171 kB)
	
and one that is too small:

	INFO:  free space map: 49 relations with free space, maximum of 1000 relations trackable
	INFO:  17266 pages stored, 18000 pages used (with overhead)
	INFO:  18768 pages required to store all freespace, maximum of 18000 pages allocatable (171 kB)
	NOTICE:  the number of page slots needed (18768) exceeds max_fsm_pages (18000)
	HINT:  Consider increasing the configuration parameter "max_fsm_relations"
	to a value over 18768.

I find this output cleaner and easier to understand.  The "pages used"
value will match either the "required" or "maximum" value on the line
below.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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Next:From: Bruce MomjianDate: 2005-04-23 04:42:29
Subject: Re: Updated FSM display for VACUUM VERBOSE
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Subject: Re: Minor Comment updates

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