From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rainer Stengele <rainer.stengele@online.de>
Subject: question about performance when having multiple todo blocks from the
 same org files ..
Date: Mon, 13 Jan 2014 14:02:54 +0100
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To: emacs-orgmode@gnu.org

Hi.

I have a complex agenda function as can be seen below.
Beside an agenda call I do want to show todos separated in blocks, grouped by priority or tags.
I want to show my prio A todos as one block before showing the rest of the todos sorted by prio.
I was wondering if Org does run through all the org files again and again in order to collect the data wanted
or if there is something like a cache is being filled when running through all buffers, collects all todos and then groups, sorts
and is availble for printing out whats wanted.

Thank you for a reply from someone who knows the internals.

Rainer

Org-mode version 8.2.2 (release_8.2.2-193-gf10166)

...
	("01" "agenda - prio A,B todos - sorted prio up - today"  ;;
	 (

	  ;; show ONGOING todos first, but only if unscheduled, skip if scheduled
	  (tags-todo "ONGOING"
		     ((org-agenda-skip-function '(org-agenda-skip-entry-if 'scheduled))
		      (org-agenda-overriding-header "ONGOING todos: ")))
	  (agenda "todays agenda"
		  (
		   ;; (org-agenda-skip-function
		   ;; (lambda nil
		   ;;   (org-agenda-skip-entry-if 'regexp ":ONGOING:")))
		   ;; (org-agenda-skip-entry-if 'regexp ":ONGOING:")))
		   (org-agenda-span 'day)
		   (org-agenda-start-with-log-mode t)
		   (org-agenda-start-with-clockreport-mode t)

		   (org-agenda-overriding-header "Today's Agenda")))

	  (alltodo "!!! TODOs Prio A - skip ONGOING todos!!!"
		   (
		    (org-agenda-skip-function (lambda nil
						(or (org-agenda-skip-entry-if (quote notregexp) "\\=.*\\[#A\\]")
						    (org-agenda-skip-entry-if 'regexp ":ONGOING:")
						    (org-agenda-skip-entry-if 'scheduled 'deadline ))))
		    (org-agenda-overriding-header "!!! TODOs prio A - skip ONGOING todos: !!!")
		    ))
	  (alltodo "todos Prio B til D - skip ONGOING todos"
		   (
		    (org-agenda-skip-function (lambda nil
						(or (org-agenda-skip-entry-if (quote notregexp) "\\=.*\\[#B\\|#C\\|#D\\]")
						    (org-agenda-skip-entry-if 'regexp ":ONGOING:")
						    (org-agenda-skip-entry-if 'scheduled 'deadline ))))
		    (org-agenda-overriding-header "All todos prio B til D - skip ONGOING todos: ")
		    ))
	  )
	 ((org-agenda-sorting-strategy '(time-up priority-down todo-state-up))))
...