[comp.sys.mac.system] System file modified after reboot and MMfix

yee@osf.org (Michael K. Yee) (01/25/91)

	I just noticed last night that my System 6.0.7 file appears to be
	modified everytime I reboot (i.e. the modification time in Get Info
	changes).  I started checking because I installed the MMfix (memory
	management fix INIT), and then later read in mac.digest that the
	MMfix INIT may cause system troubles.  So has anyone seen this
	behavior??  Thanks in advance for any enlighment on this.

	BTW: MMfix did not seem to increase performance - at least, not
	according to Speedometer 2.5.

	Mac LC running -
	System 6.0.7, Suitcase 1.2.8, Init CDev 3.0, Gatekeeper, ...


	=Mike
 
--
= Michael K. Yee		-- yee@osf.org or uunet!osf.org!yee --
= OSF/Motif Development
= "I can't give you brains, but I can give you a diploma." -- The Wizard of OZ

fwb@pollux.tmc.edu (Fred Brehm) (01/25/91)

Michael K. Yee writes:
>
>	I just noticed last night that my System 6.0.7 file appears to be
>	modified everytime I reboot (i.e. the modification time in Get Info
>	changes).  I started checking because I installed the MMfix (memory
>	management fix INIT), and then later read in mac.digest that the
>	MMfix INIT may cause system troubles.  So has anyone seen this
>	behavior??  Thanks in advance for any enlighment on this.

This (Modified date changed) is normal behavior.  It has nothing to do with
MMinit.  I don't know what gets changed, or why, though.  This behavior is
the cause of the "Skip System files" option in many disk backup applications.

I also saw the report in the info-mac digest.  Sometimes these kinds of reports
are followed a few days later with a "sorry, it was (hardware, another init,
cockpit error, ...)" message, so I don't panic with the first report of a
problem.

I do, however, pay attention when I add something new to a system.  MMinit is
installed on several IIfx and IIci (I think) around here.  Nobody has had
any problem yet, and there are lots of different combinations of init's,
cdev's, da's, and applications on those machines.

>	BTW: MMfix did not seem to increase performance - at least, not
>	according to Speedometer 2.5.

You have to watch out for benchmarks. They don't always measure the right
thing.  I don't know what Speedometer measures, but it probably isn't memory
manager performance.

The people who installed MMinit around here did not notice anything until
they ran some image processing or graphics intensive application.  Then,
their reaction was something like "Wow! That's really a lot faster."

Fred
-- 
Frederic W. Brehm	Siemens Corporate Research	Princeton, NJ
fwb@demon.siemens.com	-or-	...!princeton!siemens!demon!fwb