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Questions tagged [memory]

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

86
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7answers
46k 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 ...
127
votes
2answers
175k views

How to investigate high kernel task memory usage?

I was using my MBP (with 16GB of RAM) as usual and out of blue I've this popup that: Your system has run out of application memory. To avoid problems with your computer, quit any applications ...
52
votes
7answers
63k 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 ...
57
votes
3answers
36k 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? ...
61
votes
3answers
37k views

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

The different columns in Activity Monitor are a little confusing
8
votes
2answers
46k 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 ...
21
votes
5answers
16k 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
7answers
71k 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 ...
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 ...
20
votes
3answers
22k views

Solder new RAM in a 2015 Retina MacBook Pro [duplicate]

I know that the new rMBPs have no "user-serviceable" RAM. But is it possible to solder a new RAM chip onto a 2015 rMBP? Given that the technician doing this is able to install the new chip without ...
16
votes
2answers
13k 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 from ...
30
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3answers
56k 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?
8
votes
1answer
5k 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 ...
15
votes
7answers
274k views

“Your system has run out of application memory.” How is that possible?

(Translation it->en: Your system has run out of application memory. To avoid problems with your computer, quit any applications you are not using.) How is that possible if there are only few open ...
6
votes
6answers
11k 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 RAM,...
15
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2answers
5k 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
12answers
50k 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 you've ...
40
votes
6answers
276k 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 ...
21
votes
2answers
11k 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 ...
5
votes
2answers
1k 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 might ...
4
votes
0answers
811 views

Why does OS X use swap memory when memory pressure remains low?

My system (Yosemite / 10.10) has been paging out to swap memory despite my memory pressure reading less than 50% over the last 7 days (tracked with iStat Menus). How is this possible? It would be one ...
0
votes
2answers
691 views

MBP 13' (mid-2010; 7,1) 2.4 Core 2 Duo P8600 supporting 16 GB RAM under Win7?

I’ve got a MBP 13′ (mid-2010) 2.4 Core 2 Duo (full specs below) that I’m now operating solely under Win7 64Bit. It formerly run as well under OS X 10.6.8, relatively to which the firmware seems up to ...
188
votes
21answers
219k 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 ...
34
votes
2answers
15k 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. ...
11
votes
2answers
2k views

vm_compressor=VM_PAGER_DEFAULT in Yosemite caused freeze when physical memory was full

The memory compression caused frequently lag so I tried turning it off by using the command sudo nvram boot-args="vm_compressor=1" The lag was gone but I got crashing freeze when I opened some ...
9
votes
1answer
7k 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 ...
29
votes
6answers
4k views

Temporarily disabling RAM to mimic a lower spec machine?

I've got two 2009 Macbooks. One has 4 gigs of RAM and runs os 10.10; one has 2 gigs and runs os 10.5. I'm considering upgrading the latter machine to Yosemite (10.10), but I'm worried that it will ...
15
votes
2answers
7k views

What is memory pressure, and how do I relieve it?

I have had my machine for more than a year now, and I'm looking at Memory Pressure in the Activity Monitor. What is this memory pressure and How do I "relieve" this memory pressure from my system? ...
12
votes
3answers
18k 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 ...
30
votes
8answers
69k views

Can I solder more memory into my MacBook Air?

I love everything about my Macook Air except its very low maximum memory (and yes I bought it with the maximum available at the time). So I'm thinking "I know how to solder... how hard can it be?". ...
11
votes
1answer
5k 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 ...
11
votes
2answers
4k 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 ...
11
votes
4answers
17k views

icdd process consuming substantial memory on macOS

In the past week or so the process 'icdd' has been starting from time to time and when it does it consumes massive amount of RAM (upwards of 7 GB). When this happens, my MacBook Pro essentially ...
2
votes
1answer
1k views

MacOS 10.10 on 4 GB memory bloat: which launch daemons/agents/services can I disable? And how to discover the names of the culprits?

I recently did a Yosemite (10.10) clean install on my 4 GB 2010 MBP, but it now has so much memory bloat due to unnecessary launch daemons/agents /services that it causes frequent beachballing; ...
9
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 ...
8
votes
4answers
61k 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 ...
6
votes
5answers
37k views

Can a 2009 MacBook Pro use more memory than Apple's 'maximum RAM' figure of 8 GB?

I have a 2009 MBP with 8GB of RAM. I run Windows under Parallels pretty much all the time (I use Visual Studio for work). I recently installed an SSD to speed it up a bit and its running beautifully. ...
4
votes
1answer
2k 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 (...
3
votes
1answer
923 views

Crash with error “No more room to grow table”

For the past week or so my computer has been crashing at least once a day with the same error. *** Panic Report *** panic(cpu 2 caller 0xffffff8018318b7f): "No more room to grow table: ...
28
votes
2answers
7k 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
4answers
52k views

Is it ok to mix 2 GB and 4 GB DIMMS in an iMac (mid 2011)?

I've been told it is important to use matching DIMMs when installing memory to take advantage of the 128 bit throughput. I'm looking to buy a new 27" iMac (mid 2011) which has 4 memory slots. If I put ...
9
votes
2answers
3k 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 ...
8
votes
0answers
3k views

Can I turn off swap and/or memory compression on macOS 10.12, Sierra?

Is there a way with macOS 10.12, Sierra, to safely turn off compressed memory? And is there a way to turn off safely swap? This was possible on macOS 10.9 and macOS 10.10. Although it sometimes ...
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
3k 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
3answers
6k views

Why does speech recognition take up 1 GB or RAM suddenly? And Gmail in Safari 738 MB?

I did enable speech recognition just in case, but very rarely use it, and I did not remember even accidentally activating it since bootup. Now I simply have a few apps running under Mavericks, and I ...
3
votes
2answers
1k views

Is using mid 2012 MacBook Pro RAM in mid 2011 iMac 27" an option?

I recently came into possession of a 27 inch mid 2011 iMac. It only has 4GB RAM and I have been pricing compatible memory modules online. I then remembered I also have a 13 inch mid 2012 MacBook Pro ...
3
votes
1answer
2k views

New to Macbook Pro, need help upgrading

I was recently gifted an old Mid 2010 Macbook Pro with the following specs listed here: http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i7-2.66-aluminum-15-mid-2010-unibody-...
3
votes
1answer
823 views

MacBook Pro Memory

This relates to my previous question regarding my MacBook Pro. Why is my MacBook Pro quitting and/or failing to start up? I need to replace one of my 2G DIMMs and in shopping around at Crucial and ...
2
votes
2answers
942 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 ...