Memory normally refers to RAM. Temporary, high-speed storage used to keep frequently accessed information available for use and helps keep the computer running smoothly

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53
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6answers
30k views

Isn't Inactive memory a waste of resources?

I'm looking for explanation of memory usage on my machine especially in light of the example in this screenshot below: I understand what is Free and Active means But what are the meanings of Wired ...
32
votes
3answers
16k views

What's the difference between Real, Virtual, Shared, and Private Memory?

The different columns in Activity Monitor are a little confusing
18
votes
5answers
10k views

What does it mean if I have lots of “Inactive” memory at the end of a work day?

After a day's of work at my MacBook Pro running Mac OS X 10.6.5, Activity Monitor shows that the majority of my computer's 8 GB of memory is "Inactive", and only a tiny sliver of the pie chart is ...
8
votes
2answers
1k views

Trouble Understanding Inactive Memory in MacOSX

I thought that I understood how MacOSX manages memory, but recently I’ve become baffled by its performance. Here is the situation: I have a brand new Core i7 system with 8GB of physical memory ...
25
votes
6answers
16k views

What is wired memory?

I'm trying to figure out what is using all of the memory in my Macbook Pro running OS X Lion. I have 8 GB of memory total. When I quit all active programs except Finder and Activity Monitor, then run ...
4
votes
2answers
10k views

Using memory with a higher MHz rating? [duplicate]

Can MacBook Pro's successfully support and fully exploit RAM of a higher MHz rating than that which they ship with? For example, take my 15" MacBook Pro (Late 2011) that ships with 4GB of 1333MHz ...
9
votes
1answer
3k views

Why is it that my Mac would rather swap than clear inactive memory?

Why is it that my Mac (running 10.8 Mountain Lion) would rather swap than clear inactive memory? I know people say that the Mac OS manages itself and whatever, but there is a serious performance dip ...
12
votes
2answers
4k views

Can I force my Mac to make better use of the inactive memory?

I use mysql and it takes up to 2.5 GB of my ram. I checked activity monitor and saw that I have 1GB of inactive memory but it never changes even if I have only 10MB active free memory. Is there any ...
7
votes
7answers
19k views

Can I use 16GB DDR3-1600MHz RAM in an early Macbook Pro 8.2?

I found Macs which had: 16GB RAM installed 8GB RAM installed, but running on 1600MHz instead of 1333MHz (link in dutch) Question Is it possible to put 16GB running at 1600MHz in my Mac? If ...
27
votes
3answers
18k views

What scale or measure does Mavericks' and Yosemite's “memory pressure” adhere to?

Mavericks' (and also Yosemite's) Activity Monitor shows a new diagram, the memory pressure. Sadly, its help text only vaguely explains what exactly it measures. How is memory pressure calculated? ...
12
votes
7answers
54k views

Mavericks unusually high RAM usage

I thought Mavericks was suppose to utilize RAM memory better, thus run smoother. Running ML on Mac mini 2012, with 16GB RAM...always running smoothly even with over a dozen apps running. Now, after ...
14
votes
2answers
4k views

Insanely high kernel RAM usage (over 9GB) in Mavericks

I upgraded to Mavericks yesterday, and everything seemed to go fine, but today I noticed that my computer was becoming a bit slow. I checked Activity Monitor, and CPU / disk were at normal levels so I ...
4
votes
6answers
7k views

Macbook Pro Upgrade - 16GB RAM or 128GB SSD

I am asking myself which constellation is better: should I stock up my RAM up to 16GB (from 8GB), or should I buy a SSD with 128GB?? I really dont know :/ Cheers! BTW: My macbook supports 16GB ...
9
votes
6answers
39k views

Can I upgrade my MacBook mid 2010 to 16GB of RAM? (2x8G)

I bought a MacBook mid 2010 which I have upgraded to 8GB of RAM. But now, 8GB is not enough for me. I need more RAM for my work. Can I upgrade my MacBook's RAM to 16GB? I know the new Macbook Pros ...
26
votes
2answers
11k views

kernel_task using *way* too much memory

I have a 2008 Mac Mini with 4 GB of RAM. Recently (post installation of Lion), it started to behave extremely sluggishly, so I used Activity Monitor to see what was using up the system resources. ...
6
votes
1answer
5k views

Testing a MacBook Pro's RAM upgrade

What are the best possible RAM tests that can be run on a MacBook Pro (Early 2011 running Mountain Lion) after upgrading RAM from 4 GB to 16 GB? I see there a quite a few tools out there and the ...
8
votes
1answer
3k views

Is integrated VRAM included under `kernel_task` RAM in Activity Monitor?

I was stunned to discover that Mac OS X kernel can consume 750MB of RAM. A few related questions: Is it a problem if kernel_task is routinely above 130MB on mid 2007 white MacBook? kernel_task using ...
4
votes
2answers
899 views

Why might more memory be wired in safe mode than in normal mode?

Maybe more noticeable in Lion and Mountain Lion, than in Snow Leopard and earlier versions of the operating system: in safe mode, an unexpectedly large amount of wired memory. Question Why ...
7
votes
2answers
791 views

How can virtual memory be greater than the total available space?

Why does my MBP sometimes report VM Size: 300+ GB in Activity Monitor under System Memory tab, when my hard disk size is only 250 GB (total) and RAM is 4GB? I know it can't magically get that extra ...
6
votes
3answers
3k views

Why does Finder use 59GB of swap space?

My new retina MacBook Pro(with 16GB RAM) keeps receiving this "Your Mac OS X startup disk has no more space available for application memory" message. I have 300 GB of free space on my hard drive, and ...
3
votes
1answer
725 views

How to prevent OSX from allocating as much virtual memory as there is space available on the hard drive?

I recently had data loss because the hard drive was completely used up by virtual memory and some programs couldn’t handle zero free space on the hard drive. How can I prevent this from happening ...
2
votes
2answers
2k views

Is it a problem if kernel_task is routinely above 130MB on mid 2007 white MacBook?

In trying to get the best performance possible out of this old guy, I've been looking into Activity Monitor more and more. kernel_task is usually above 130MB (142.9MB right now). Is this abnormal? If ...
6
votes
3answers
2k views

Apple-Certified RAM?

I'm planning to upgrade my RAM in my MacBook Pro (Late 2008) from the base 2GB to 4GB. I'm planning to buy RAM from Kingston. There's two types of Kingston 1066 2GB RAM here. (Laptop-sized RAM) ...
5
votes
1answer
2k views

How can I check to see if my Mac is running in dual channel mode?

I've just upgraded my iMac's memory with a new 2x8GB kit: Although I know this "should" be dual channel (as both banks have the same amount of RAM), I'd like to know for sure. How can I check?
3
votes
1answer
718 views

MacBook Pro Memory

This relates to my previous question regarding my MacBook Pro. http://apple.stackexchange.com/questions/1450/macbook-pro-will-not-start-or-quits I need to replace one of my 2G DIMMs and in shopping ...
2
votes
2answers
809 views

OS X Lion: 8GB of RAM, 20MB free

I have a Macbook Pro (early 2011) running OS X Lion and while running a few apps that only take up, say, 200 MBs of space each (Xcode, Spotify, and Photoshop), my wired memory shoots up to 1.4GB, my ...
1
vote
2answers
61 views

Others in Macintosh HD

How can I reduce the size of my HD folder? I have more than 22 GB in "others". It is actually using more memory than my documents and apps and does not show contents. I have deleted the main info in ...
1
vote
2answers
301 views

Can an 2009 iMac have an odd total amount of RAM?

I have an iMac 20-inch early 2009 model. There is 2 GB of RAM (2 x 1 GB sticks). Can I upgrade the amount of memory to 3 GB, replacing just one of the two RAM sticks?
0
votes
1answer
494 views

How much RAM can a 2007 iMac hold?

The box says I can add up to 3 GB (for a total of 4GB), but is this restriction hardware based, or because of the operating system? If I upgrade to OS X 10.6 or higher, can I increase the RAM to 8 GB ...
8
votes
1answer
3k views

vm_compressor_mode (vm.compressor_mode) values for enabled compressed memory in OS X

Background In Super user, with an accepted answer: Disable compressed memory in Mac OS 10.9 Mavericks? Also in Super User: how to get memory compress back in Mac OS 10.9 Mavericks? – and ...
6
votes
2answers
4k views

Disable inactive memory swapping

Background: OSX keeps some information in RAM that is no longer used, but was recently used. This is called inactive memory, and is intended to improve user experience by speeding up some actions: ...
9
votes
4answers
9k views

Safari is using too much RAM. How can I reduce its memory footprint?

I'm finding Safari (Latest - v5.0.2) to be even more of a memory hog than usual. (Currently using 465mb of RAM with only this tab open, but having been running for a while) Closing it and ...
4
votes
1answer
2k views

find what's producing inactive memory

First of all i'd like to ask politely for all of those who feel the need to explain it to me how perfect apple's memory management is to ignore this thread. A little background: The theory goes that ...
13
votes
2answers
8k views

Why do Apple's latest MacBook Pros cap the RAM limit at 8GB?

According to apple's latest documentation (at the time of writing), the cap on the newest MacBook Pros is 8GB RAM. The Mac Pros, however, can take up to 32GB RAM. So, why do the MacBooks have this ...
3
votes
2answers
14k views

How can I use automator to run “purge” command in Mavericks?

In Mountain Lion, I frequently used a simple automator app called "Purge Memory" which just ran "purge" in the command line. I really enjoyed cleaning the RAM, especially when buggy apps ran memory ...
4
votes
1answer
268 views

MacBook unusable due to kernel_task

I've disabled hibernation, and removed the sleep image file. I shutdown my Macbook Pro (15" retina), unticked the box to open windows on restart, and started my MacBook again. As soon as I'd logged on ...
29
votes
4answers
2k views

Is there a real benefit to removing applications from the iOS multitasking bar?

Sometimes, if my iOS device (ipad or ipod touch) is acting sketchy or slow, I will bring up the multitasking bar (double-press the home button) and then remove items from that multitasking bar (do a ...
26
votes
2answers
6k views

Does the new Macbook Pro with Retina display have user-upgradeable RAM?

I'm interested in purchasing the new MacBook Pro with Retina display, but it's not clear from the tech specs page whether the RAM is user-upgradeable or not. Do I need to take into account future RAM ...
9
votes
3answers
708 views

Why is my RAM nearly fully used?

I bought a Macbook Pro 15 inches 3 months ago. It's running on Mac OS X Snow Leopard and it has 4GB of RAM. I consider having a fair use of this computer : - surfing (Chrome) - developing (Fraise) - ...
7
votes
4answers
20k views

Startup disk has no more space available for application memory?

I purchased a new Macbook Pro (8,3) last April, and have been using it heavily for xcode development, and little else. This morning a message popped up: "Your Mac OS X startup disk has no more space ...
6
votes
2answers
2k views

Glitches in OS X - memory or ssd?

My laptop is Macbook pro 15', Early 2011, with an SSD drive - OCZ Agility 3 240GB. I changed my memory too to 16GB (Corsair from Amazon). I experience glitches: Also Skype refuses to launch. I ...
5
votes
1answer
1k views

Mixing memory sizes

I'm looking at upgrading the memory in my mid-2011 iMac. Is there any problem with sticking in 2 4GB modules alongside the existing 2GB modules?
3
votes
2answers
683 views

Why is my memory still inactive after purging?

I'm trying to understand how memory is allocated on my machine. I have read, and believe I understand, these posts and associated links: Trouble Understanding Inactive Memory in MacOSX, Inactive ...
3
votes
4answers
1k views

Where are good places to buy RAM (memory) for a Mac?

What reputable stores exist for purchasing RAM for a Mac?
2
votes
3answers
136 views

What does “Vector 0xdd(TMR)” do and how can I fix a problem that I'm having with it?

I am currently having problems with kernal_task using ~2GB of RAM and looking at what advice exists I ran sysdiagnose and in powermeterics.txt I found that Vector 0xdd(TMR) was doing ~20,000 ...
2
votes
2answers
3k views

Can the mid-2010 Macbook support more than 4GB of RAM?

I know of sites that sell 8GB sets for the MacBook. Apple states that they can have up to 4GB. One of my co-workers got her first gen MacBook to 6GB. Can anyone confirm that 8GB is recognized in last ...
1
vote
2answers
4k views

Can I use 16 GB RAM with my MacBook Pro 7,1?

I just picked up 16GB of RAM for my MacBook Pro, running the newest OS X. According to the NewEgg reviews, it should work in it. However, once I boot up, it shows the Apple logo and, after a few ...
7
votes
1answer
2k views

Can I put more than 8GB of Ram in a MacBook Pro 5.1

I have a 5.1 MacBook Pro (5.1 Model Late 2008) with 4GB of Ram. All the apple documentation I can find that the maximum supported for this model is 8GB of RAM (2 x 4GB). Has anyone tried to put bigger ...
5
votes
4answers
25k views

Can I use 1333 MHz RAM in a 1067 MHz MacBook Pro?

I've got a MacBook Pro from mid 2010 (6,2) and there is 2GB DDR3 RAM at 1067 MHz installed. I want to upgrade to 8GB but with 1333MHz as speed. Is this possible? Can my Mac support this kind of speed ...
5
votes
2answers
3k views

Way to limit how much RAM an arbitrary process can take up?

Lets say we have a OS X machine running with 4 GB of RAM. Is it possible to set it up so no single process can take up more than say, 3 GB, so no matter how memory hogging a process is, there's always ...