[Evolution-hackers] shutdown performance ...

[Michael Meeks <michael ximian com>]

Hi there,

	I was just shutting down evo. on my machine under some considerable
load and since I've been wondering about performance (particularly on my
slow-disk'd system) for some time I did an strace:

	http://primates.ximian.com/~michael/evo-shutdown-log.txt

	I'll try and get a better one in a minute ( this only caught the end of
the thrash, and only part of that with -ttt ).

	Either way; it seems there is a per folder loop:

open("/home/michael/evolution/config/.#et-expanded-file:_home_michael_evolution_local_Mail_subfolders_bonobo", O_WRONLY|O_CREAT|O_TRUNC, 0600) = 42
write(42, "<?xml version=\"1.0\"?>\n<expanded_"..., 64) = 64
fsync(42)                               = 0
close(42)                               = 0
rename("/home/michael/evolution/config/.#et-expanded-file:_home_michael_evolution_local_Mail_subfolders_bonobo", "/home/michael/evolution/config/et-expan
ded-file:_home_michael_evolution_local_Mail_subfolders_bonobo") = 0
unlink("/home/michael/evolution/config/hidestate-file:_home_michael_evolution_local_Mail_subfolders_bonobo") = -1 ENOENT (No such file or directory)
write(3, "\231\7\2\0}\10\343\0006\7\2\0|\10\343\0\231\7\2\0\342\27"...,
2044) = 2044
open("/home/michael/evolution/.#searches.xml", O_WRONLY|O_CREAT|O_TRUNC,
0600) = 42
write(42, "<?xml version=\"1.0\"?>\n<filteropt"..., 2780) = 2780
fsync(42)                               = 0
close(42)                               = 0
rename("/home/michael/evolution/.#searches.xml",
"/home/michael/evolution/searches.xml") = 0

	It re-writes searches.xml each time around the loop; and does an fsync
- causing some nice head movement ;-) is it easy to make at least that
part of the write-out atomic over the whole set of folders - currently
it seems to do it once per folder; and/or is that worth doing?

	Also; given that it's always going to be painful seek-wise to store the
expanded state (which I assume is what it is) in a separate file per
folder; is it possible to minimise / UI-tie the update ? ie. can the
state be serialised when we switch away from a folder view (and thus
stop expanding/contracting nodes) ?

	Obviously I guess this may all be much improved in the evo. development
stuff; I'm only using 1.4.5.

	Thanks,

		Michael.

-- 
 michael ximian com  <><, Pseudo Engineer, itinerant idiot