Re: size of emacs executable after unicode merge

[YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>]

>>>>> On Sat, 17 May 2008 09:56:58 +0900, Kenichi Handa <handa@m17n.org> said:

> They are surely loaded on demand.  And, at the end of the dumping
> process, by calling clear-charset-maps, all loaded maps are set to
> nil, and then garbage-collect is called.  So I think they are not
> included in the dumped Emacs.  Perhaps some other char-table is the
> culprit.  Maybe Vchar_unify_table.  I must re-read src/charset.c.

I tried taking some heap statistics during loadup on Mac OS X.  It
would be interesting to focus on the changes in the numbers of
1024-byte blocks and 48-byte blocks as they are major factors of the
increase/decrease.

The major increases in the used heap size are observed at the load of
international/mule-conf (564KB -> 8897KB) and
international/characters (9627KB -> 14685KB).

  Before loading international/mule-conf:
  Overall size: 9359KB; 1512 nodes malloced for 564KB (6% of capacity); largest unused: [0x1855e00-7848KB]
  # of 1024-byte blocks: 193	# of 48-byte blocks: 959

  After loading international/mule-conf:
  Overall size: 9623KB; 18028 nodes malloced for 8897KB (92% of capacity); largest unused: [0xe89920-473KB]
  # of 1024-byte blocks: 7858	# of 48-byte blocks: 9035


  Before loading international/characters:
  Overall size: 18123KB; 19500 nodes malloced for 9627KB (53% of capacity); largest unused: [0x2041e00-7928KB]
  # of 1024-byte blocks: 8106	# of 48-byte blocks: 9969

  After loading international/characters:
  Overall size: 23243KB; 102539 nodes malloced for 14685KB (63% of capacity); largest unused: [0x2155800-6825KB]
  # of 1024-byte blocks: 9358	# of 48-byte blocks: 91721

The clear-charset-maps call followed by garbage-collect surely reduces
the size of the used area (15958KB -> 9188KB), but the unused area is
not returned to the system at least on Mac OS X (i.e., "Overall size"
does not change).

  Before clear-charset-maps:
  Overall size: 23703KB; 105317 nodes malloced for 15958KB (67% of capacity); largest unused: [0x222c000-5967KB]
  # of 1024-byte blocks: 9865	# of 48-byte blocks: 92577

  After clear-charset-maps with garbage-collect:
  Overall size: 23703KB; 91717 nodes malloced for 9188KB (38% of capacity); largest unused: [0x222c000-5967KB]
  # of 1024-byte blocks: 3484	# of 48-byte blocks: 85777


FYI, below is the final result of Emacs 22.2.50.

  Overall size: 10023KB; 18828 nodes malloced for 3319KB (33% of capacity); largest unused: [0x19ae000-6471KB]
  # of 1024-byte blocks: 1245	# of 48-byte blocks: 15510

				     YAMAMOTO Mitsuharu
				mituharu@math.s.chiba-u.ac.jp