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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69
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16answers
56k views

Is there a Mac OS X Terminal version of the “free” command in Linux systems?

On Linux, I often use the free command to see the current amount of free and used memory in the system. For example: $ free total used free shared buffers cached ...
53
votes
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
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 ...
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? ...
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 ...
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. ...
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 ...
20
votes
2answers
6k views

Why ever does Parallels 8 recommend max 4 GB RAM for a VM?

I'm a VMware Fusion user and am trying out Parallels since VMware has some quirks that are annoying on Mountain Lion on a retina MacBook Pro (16 GB RAM). I'm wondering about the baffling Parallels ...
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 ...
17
votes
5answers
12k views

Is RAM upgrade worth it if I have an SSD already?

I recently purchased a Macbook Pro. I had an SSD from my last computer which I formatted, installed into my Mac, and used as my one and only HD (I don't need that much space so I didn't opt to do the ...
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 ...
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 ...
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 ...
12
votes
2answers
5k views

What does FreeMemory actually do?

There's a highly-rated app on the Mac App Store called FreeMemory. It claims to be able to "increase your free memory with a simple click." Although it's free right now, I believe it normally goes ...
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 ...
9
votes
3answers
7k views

How does memory management work in Mac OS X?

I am a university student who has been trying to write a compare and contrast paper between how Windows, Linux, and Mac OS X manage memory. For instance, with Windows, it's physical memory (RAM) and ...
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 ...
9
votes
3answers
709 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) - ...
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 ...
9
votes
2answers
17k views

What exactly does kernel_task do?

I'd just like to know what it is that kernel_task is responsible for. Also, what's an acceptable maximum RAM and CPU use for it?
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 ...
9
votes
2answers
493 views

Recover in-memory Pages data from failed hibernation wakeup

My girlfriend's Macbook crashed while attempting to restore from a hibernated file. The progress bar stopped at ~10%, after which we restarted the computer for a normal startup. This hibernated ...
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 ...
8
votes
2answers
5k views

UI Lag OSX Yosemite (10.10) on Retina MacBook Pro late 2013

I have a late 2013 rMBP, 13" with the following specs: Processor: 2.6 GHz Intel Core i5 RAM: 16 GB 1600 MHz DDR3 Video: Intel Iris 1536 MB (integrated) Before upgrading to Yosemite, Mavericks ...
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 ...
8
votes
2answers
1k views

Tool for determining performance bottleneck

I am using my early 2011 MacBook Pro for iOS development, Photoshop work, and the like, and it is at times quite sluggish. Is there a tool that I can just run for a day, and then look at the ...
8
votes
3answers
866 views

How do I automatically kill processes that leak memory?

I have problems with processes that leak memory. They cause my hard drive to be filled with swap files in /private/var/vm. I would like leaking processes to be killed at sight by the OS. I’m not ...
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 ...
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 ...
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 ...
7
votes
2answers
792 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 ...
7
votes
1answer
2k views

Memory terminology in Mavericks Activity Monitory

In Mavericks, the Activity Monitor has changed its memory terminology. The columns available when viewing processes in the memory tab now include "Memory", "Real Memory", "Real Private Memory", "Real ...
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
3answers
4k views

How do I check how many RAM slots I have in use?

I own a 2010 13" macbook, and I'd like to do a RAM update from 2gb to 4gb. Before I buy brand new 2x2gb ram, I'd like to make sure that my macbook has 2x1gb or 1x2gb ram slots. I mean, if both slots ...
6
votes
4answers
3k views

Can I install 16GB RAM on quad-core MacBook Pro?

I'm planning to buy a new MacBook Pro with quad-core. And I want to install 16GB on it. But there is only 8GB options on Apple's website. Is this possible?
6
votes
4answers
4k views

How much RAM can I add to my macbook

I have a 2008 macbook with a 2.1 GHz Intel Core 2 Duo. I am in the process of upgrading to Lion. I currently have 2GB 667 MHz DDR2 SDRAM What's the maximum amount of RAM I can put in and it have an ...
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) ...
6
votes
2answers
9k views

com.apple.iconServicesAgent using a lot of RAM in 10.9

I performed a fresh install of OS X 10.9 and now the process com.apple.iconServicesAgent is using >300MB of RAM, that is quite a lot. This process is using the second most amount of memory of all ...
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: ...
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 ...
6
votes
1answer
1k views

Why does OS X use virtual memory when I still have free RAM?

I have this awesome MacBook Pro with 8 GB of RAM. When I open up Activity Monitor it would seem that I have plenty of RAM available, but my computer seems to prefer to use virtual memory for many ...
6
votes
4answers
9k views

Will Early 2009 iMac accept faster-than-spec RAM?

I am looking to upgrade the RAM on my Early 2009 iMac from 4GB to 8GB. According to the memory specifications it accepts PC3-8500 204-pin SO-DIMMs. However, will the iMac accept faster RAM (e.g. ...
6
votes
3answers
6k views

MacOSX cpu/mem monitor in system tray (menu bar)

I would like to monitor cpu/mem usage realtime with charts in MacOSX system tray (menu bar). Is there any utility that provide such functionality?
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 ...
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 ...
6
votes
1answer
2k views

Does the iPhone support TRIM for flash memory?

I'm asking if TRIM is enabled on iOS because, ever since I ran out of memory on my iPhone (have since cleared a few GB back), it seems to be slower than it was before. My suspicion being that, with ...
6
votes
1answer
6k views

Why is mds using so much Real Memory?

I notice that mds is almost always on top for use of Real Memory. I wouldn't mind if this wouldn't be also the case when Free Memory runs out. Usually mds uses over 600MB on a system with 4GB (I ...
5
votes
3answers
10k views

Why can Mac OS X 32-bit access all 4GB of memory, while Windows 32-bit can't?

I don't understand why Mac OS X 32-bit kernel can access all 4GB of memory (and even more) while Windows 32-bit can only work with ~ 3,3 GB, and for using more than 4GB you need 64-bit Windows. Even ...
5
votes
6answers
11k views

How can I increase command line memory_limit for PHP with MAMP PRO?

I've edited every single php.ini on my Mac (at least all the ones found by "locate") and still can't seem to increase the memory_limit directive for PHP. I'm using MAMP PRO and running PHP scripts in ...