Mac os x mavericks memory management

To start the conversation again, simply ask a new question. Posted on Oct 23, 8: Page content loaded. Oct 23, 8: Mavericks uses memory smarter than previous OS's, not necessarily less memory.

Memory compression brings RAM Doubler to OS X Mavericks - CNET

Look at the swap memory if that is high then you have a problem. Also, if the mac is still running fast then there isn't a problem. I noticed that Mavericks is utilizing more memory than Mountian Lion did, I purchased a new iMac 27 inch with 8Gb of memory last weekend. When viewing the utilization of memory under Mountain Lion i noticed I had about 4Gb of free memory. Upon installing Mavericks I now show less than 1Gb of memory free. I do have to say I havent notice any preformance issues thus far but it has made me reconsider purchasing additional memory for my iMac. I agree, that sounds normal for Mavericks - unless 'Swap Used' is significant, there's no problem.

Oh, so thats normal with this new system. I must admit that at first i did think.

Oh my. This is not good.

And i'm still not sure but ofcause as more people who knows about this say its alright. I will feel much. Mavericks now has a memory compression feature that will compress the memory occupied by applications that aren't being actively used and give the freed up RAM to the application that needs it the most.

The result is a much more responsive system and less memory being dumped to a swap file to the HDD which is what reduces the performance of your Mac.

Super speedy, super efficient compression

If I were you, I would not look at the RAM used number but rather to the Memory Pressure graph that tells you how stressed is the system in terms of memory. Correct, checkout the MacRumors. Developers were discussing this issue and have better explanations than I could provide. Thats cool. Thanks a lot for clearing this. That makes sense at least. Oct 25, 9: Why is my Mac running slower then. I see the little wheel spinning more often. To turn on Activity Monitor or Terminal used to be quick. Now, Mavericks thinks RAM's about it too much. All this is after two days of Mavericks. Everything is Indexed.

Everything I start now takes longer. Now I cant last 24hrs with my PBX running without the application hanging and getting a message that reads Oct 26, I have a MacBook Pro mid , I bought it about 4 months ago, it came with Mt Lion and had no problems, now after installing Maverick it is running slow, tell the turth a snail moves faster.


  • amiga emulator mac os x 10.8.
  • macos - How does memory management work in Mac OS X? - Ask Different?
  • No longer an apex predator, OS X takes some time for introspection.;
  • buy mac os x 10.7 lion online;
  • sync iphone messages to mac.
  • Your Answer!
  • Share your voice!

What I have found out is Maverick is very heavy on RAM, if you have only 4GB like I have then you are going to be waiting a long time for anything to work. At the moment I have 4GB but only Oct 26, 6: I think increase your memory would solve that but I hope that memory compressing would get us free of increasing it. Oct 27, 3: With ML, I had no problem. The amount of free memory with apps opened was about 1.

Understanding Memory Pressure in OS X Mavericks

The OS is very slow with only one or two applications! If the application that created the cache needs that information again, it will just have to recompute it. You might think that no application developer would ever willingly mark any memory as purgeable. Why volunteer to have your memory reclaimed by the OS?

Memory compression brings RAM Doubler to OS X Mavericks

Purgeable memory regions allow developers to choose which memory gets reclaimed first from their applications. Memory-mapped files can go back to living only on the disk. In-memory caches of file system data and metadata can be expunged. In Mavericks, the OS has one more option before it has to resort to swapping: Mavericks will find the least-recently-used data in memory and compress it, usually to about half its original size.


  • mac tool box side cabinet for sale.
  • OS X, Mavericks: 5 steps to a faster Mac.
  • More resources, fewer drawbacks.

The compression and decompression process is extremely fast, using the WKdm compression algorithm , and it will run in parallel, taking advantage of multiple CPU cores. Intuitively, a multi-core CPU grinding away compressing data in RAM does not seem like a winning strategy to save energy. But our intuition is often wrong when it comes to real-world energy use on modern hardware.

It can be, and it is. In fact, Mavericks seems fairly terrified of the swap file. Ask for more RAM in this situation and Mavericks goes after its own file cache while still holding the line on swap. Ask for way more RAM—gigabytes more—and the memory compression starts.

Apple Footer

Eventually, the use of swap is unavoidable. But just look at how far Mavericks can go before it finally resorts to swapping to disk. Put Mountain Lion under the same kind of memory pressure and things go south quickly.

OSX mavericks - compressed memory

As soon as RAM is exhausted, Mountain Lion has no choice but to start swapping to disk, driving performance off a cliff.