Memory compactification runs drive??

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3 total messages Started by david fry Fri, 03 Oct 1986 18:27

#7468

Author: david fry
Date: Fri, 03 Oct 1986 18:27

15 lines
1263 bytes

I've noticed that calls to the Toolbox routine MaxMem (which does heap
compactification) cause my WhisperDrive(tm) hard drive to seek the 
System file.  This is happening in an application I'm writing and with
the Diskinfo DA if you select "Compact memory" (although that may
call the CompactMem toolbox routine).  It also happens from a floppy
(startup) disk, but with my hard drive still connected.

It doesn't seem to me as though this happened before.  Why does the
function call cause the program to access the System file?

David Fry				fry@huma1.harvard.EDU
Department of Mathematics		fry@harvma1.bitnet
Harvard University			fry%huma1@harvsc4.bitnet
Cambridge, MA  02138			...!harvard!huma1!fry

Re: Memory compactification runs drive??

#7546

Author: scott douglass
Date: Thu, 09 Oct 1986 18:47

9 lines
1076 bytes

The _MaxMem trap compacts the heap and purges all purgable blocks.  Most
resources (including fonts) are (or should be) purgable.  The next time
one of these resources is needed (to draw text, for instance) it will
have to be read in from disk.  It's very likely that the disk access you
mention is in response to some _GetResource trap.
-- 
				--scott douglass, Apple Computer
CSNet:  scott@Apple.CSNet	UUCP:  {nsc, voder, well, dual}!apple!scott
			"Laugh while you can, monkey boy!"

Re: Memory compactification runs drive??

#7547

Author: scott douglass
Date: Thu, 09 Oct 1986 18:53

14 lines
1310 bytes

In article <310@husc6.HARVARD.EDU> fry_b@husc4.UUCP (david fry) writes:
>I've noticed that calls to the Toolbox routine MaxMem (which does heap
>compactification) cause my WhisperDrive(tm) hard drive to seek the 
>System file.

The _MaxMem trap compacts the heap and purges all purgable blocks.  Most
resources (including fonts) are (or should be) purgable.  The next time
one of these resources is needed (to draw text, for instance) it will
have to be read in from disk.  It's very likely that the disk access you
mention is in response to some _GetResource trap.
-- 
				--scott douglass, Apple Computer
CSNet:  scott@Apple.CSNet	UUCP:  {nsc, voder, well, dual}!apple!scott
			"Laugh while you can, monkey boy!"

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