Question regarding mbp's memory

[broken]

Hi, i'm a newbie to mac, and i have some questions regarding it's memory..

i have use it for about a month, and i started to notice something. Whenever i opened the Activity Monitor, i always saw that the laptop is gradually using memory, cause the Used Memory number is always increasing, slowly but sure. And also there's time when i'm running Torrent client and msn for mac and i leave it for about 3-4 hours or so, i checked at the activity monitor again, and there's only about <100mb memory left (shown in green), with most of the memory is Inactive.Is it normal? or is it because of the torrent client?
And also, is changing the Energy Saver also takes effect on taking the memory? cause i set the computer sleep timer to "never"

Sorry if it's a basic question, but i really want to know so i dont wreck this computer. Please tell me anything that can make me wreck this computer.

Thanks

 

[WildCowboy]

For the vast majority of users, just let OS X manage memory allocation...it does a terrific job of it for the most part. The most important thing to know is that Inactive RAM is essentially exactly the same thing as Free RAM...if an app needs RAM, it can take from Inactive. This is a good document to read...particularly the last section.

As long as Free+Inactive isn't getting very low, don't worry about it...you have plenty of RAM. If Free+Inactive gets low, Page Outs start to rise significantly compared to Page Ins, and you notice sluggishness in your system, then it's time to think about adding some RAM to your system.

 

[broken]

Gee, thanks a lot.. also, can i ask one more question?

i noticed that after i everytime done the software update, i took more time for my mac to start-up, but after a few days, it start-up speed back to normal. It is normal, right?

 

[Kaspers]

Well if you do a software update, and it updates some system specific files, like kernel extensions, the kernel extension cache (kext cache) is being removed, the next boot takes longer (because it doesn't have a kext cache anymore). Several boots afther this, the kextcache is up to date again, and your machine boots faster. So this is just normal, with these kind of updates.