The history of macOS, Apple's current Mac operating system originally named Mac OS X until 2012 and then OS X until 2016, began with the company's project to replace its 'classic' Mac OS.That system, up to and including its final release Mac OS 9, was a direct descendant of the operating system Apple had used in its Macintosh computers since their introduction in 1984. https://newys757.weebly.com/blog/user-manual-for-mac-os-x. This document is a Mac OS X manual page. Manual pages are a command-line technology for providing documentation. You can view these manual pages locally using the man(1) command. These manual pages come from many different sources, and thus, have a variety of writing styles.
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I have Macbook Pro running Mac OS X Leopard (10.5) with 4GB RAM. I use some applications (Parallels for Windows (1GB RAM), Firefox, mail, freemind, iTunes, Finder, Terminal and that's it), and I can observe that after some time memory is completely full and system's performance decreases. I wonder
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2 Answers
how can I know the real use of my programs in memory. I use activity monitor but if I add up all the individual contributions I never get 4GB RAM
It is a good thing that you never get 4GB RAM. Mac 3214 chainsaw manual. It would be very bad for your system if all your applications used all your real memory. There must be some free memory at all times for the system to run smoothly and virtual memory paging to work properly. I would be worried if your free memory is under 50 MB.
Apple has a support document explaining memory usage shown in Activity Monitor.
I like iStat Menus for giving me a quick snapshot of my memory/CPU/Network usage.
Mac Os X Manual Free Memory Download
if there are some services that are wasting memory and which I do not need like google update, etc, and how can I deactivate them
You can see what processes are using a lot of memory with Activity Monitor and quit processes there.
Unless your Page outs value under the System Memory tab is very high compared to the Page ins value, or you get excessive disk thrashing, I wouldn't worry about it. I think the best way to limit memory usage, given the set of applications you are using, is simply to keep the number of tabs/windows you have open in Firefox to a minimum. 4 GB should be more than enough to run that set of applications in Mac OS X.
other advices for freeing memory
Frankly, in my opinion there's not much you can do besides limiting the number of applications/startup items you launch.
The most important thing is ensuring you have enough disk space for Virtual Memory paging. The X Lab has an excellent article explaining memory usage and how to determine if you have sufficient memory.
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Answer to question 3: Use the purge command in a terminal to forcefully free some disk caches from memory. It will increase the amount of 'Free' memory available.
Man page: Mac pages instruction manual.
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purge(8) BSD System Manager's Manual
NAME purge -- force disk cache to be purged (flushed and emptied)
SYNOPSIS purge
DESCRIPTION Purge can be used to approximate initial boot conditions with a cold disk buffer cache for performance analy- sis. It does not affect anonymous memory that has been allocated through malloc, vm_allocate, etc.
SEE ALSO sync(8), malloc(3)
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Mac Os Memory Management
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