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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

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 ...
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 ...
86
votes
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 ...
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
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? ...
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 ...
43
votes
3answers
41k 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 ...
41
votes
1answer
2k views

How is the Y value for the Memory Pressure graph in Activity Monitor calculated?

How is vm.memory_pressure's value bounded / calculated on OS X 10.10.2 - Yosemite? I've researched several answers to this question and am trying a few things on the command line to get exact values ...
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 ...
34
votes
4answers
3k 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 ...
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. ...
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?". ...
30
votes
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?
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 ...
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 ...
26
votes
10answers
33k views

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

I would like to monitor CPU and memory usage in realtime with charts on a macOS system tray (menu bar). Is there a utility that provides such functionality?
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 "...
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 ...
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 ...
20
votes
2answers
7k 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 ...
19
votes
7answers
33k 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 ...
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 ...
17
votes
4answers
13k views

Why do Apple's 2012 MacBook Pros cap the RAM limit at 8GB?

According to apple's latest documentation (at the time of writing), the cap on the 2012 MacBook Pros is 8GB RAM. The Mac Pros, however, can take up to 32GB RAM. So, why do the MacBooks have this cap?...
16
votes
4answers
76k views

What is “secd” process?

I wonder what secd process does under OSX Yosemite. I am pretty sure I have seen this process running in earlier MacOS versions, but I don't remember it gobbling up all the available memory so boldly.....
16
votes
4answers
24k views

Why is my MacBook Pro already using swap memory?

I have a late 2013 MacBook Pro 13" with 8 GB of memory. Lately my MacBook Pro uses swap memory, when it has enough free memory. Is this normal and can I do something about it? Also when I only have ...
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 ...
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 ...
15
votes
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 ...
15
votes
1answer
56k views

How to identify CPU and memory usage per process on iPhone?

There are many common apps available to show total system RAM usage and free. However, my understanding is only a jailbroken phone has access to the APIs to access PER PROCESS memory usage on iOS. ...
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? ...
15
votes
2answers
67k views

Kernel_task using 300% CPU time, high fan speed and slow computer in MacBook Pro [duplicate]

My MacBook Pro has become slow lately. Activity monitor shows kernel task is using around 300% CPU. The fan is always on at high speed. Below are the details of my computer: Macbook Pro 13-inch, Mid ...
15
votes
3answers
32k views

Google Chrome Helper Using Up Too Much Memory

Google Chrome Helper is appearing in Activity Monitor a dozen times and overall using a ton of memory. How do I curtail this? Most advice columns say to go to my plugins and check "Play on click", ...
14
votes
4answers
14k views

When will Finder use large amount of memory?

Sometimes I see the iMac with 4GB of RAM having a few MB of swap file only, and after I left for a few hours and come back, the swap file is 2.7GB. Looking into the Activities Monitor, the Finder is ...
13
votes
2answers
6k 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
7answers
62k views

iMac with 8GB RAM — memory always almost full

I have a 27'' iMac (Late 2012, OS X 10.9.2) with 8GB RAM. The usage of memory is always above 7GB, even though I don't think I am running that much stuff. This leads to the occasional hanging of a ...
12
votes
2answers
119k views

Can I upgrade RAM on late 2013 retina Mac Book Pro?

Do the late 2013 models (13" - (ME864, ME865, ME866), 15" - (ME293, ME294)) support RAM upgrades?
12
votes
3answers
16k 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 ...
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 ...
12
votes
7answers
36k 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 ...
12
votes
4answers
21k 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 ...
12
votes
2answers
11k views

Safe to kill spindump? (Older/slower machines)

I have an old Mac, where if an App take some time to load (slow HD), the spindump kicks in, completely disabling the machine for close to 10 minutes. There is one post on the web warning that killing ...
12
votes
2answers
7k views

kernel_task filling up disk

Something weird just happened. I got a warning that my disk was running out of space. I knew that it had like 15GB free before and wondered where all the free space went. I checked Activity Monitor ...
11
votes
2answers
9k 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 ...
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
3k views

Why does leaked memory appear malloced to kernel_task, and why can't OS X therefore garbage collect it

I have previously been told that a sign that some application has a memory leak is that kernel_task has a large memory footprint, commonly on the order of gigabytes. If an awry kext was causing this ...
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 ...
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 ...
11
votes
3answers
19k views

MRT Process using large unbounded amount of memory

Today my machine ran out of memory. I went to Activity Monitor and it showed a process called MRT using lots of memory. I restarted my machine hoping it would help, but even after a restart I see the ...
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
1answer
4k views

How to free up a swap space manually without restart?

I'm on High Sierra on MacBook Pro with 16GB of RAM with SSD. Got 15G of swap files, is there any method of freeing swap space/files without restart? $ sysctl -a | grep swap vm.swapusage: total = ...