Currently Being ModeratedNov 5, 2013 10:46 AM (in response to zany.ninja)
It's waking up. That's all. 200 MBs of swap space is very little for a system like yours. Why are you concerned when you don't know what any of this means?
About OS X Memory Management and Usage
Understanding top output in the Terminal
The amount of available RAM for applications is the sum of Free RAM and Inactive RAM. This will change as applications are opened and closed or change from active to inactive status. The Swap figure represents an estimate of the total amount of swap space required for VM if used, but does not necessarily indicate the actual size of the existing swap file. If you are really in need of more RAM that would be indicated by how frequently the system uses VM. If you open the Terminal and run the top command at the prompt you will find information reported on Pageins () and Pageouts (). Pageouts () is the important figure. If the value in the parentheses is 0 (zero) then OS X is not making instantaneous use of VM which means you have adequate physical RAM for the system with the applications you have loaded. If the figure in parentheses is running positive and your hard drive is constantly being used (thrashing) then you need more physical RAM.
Adding RAM only makes it possible to run more programs concurrently. It doesn't speed up the computer nor make games run faster. What it can do is prevent the system from having to use disk-based VM when it runs out of RAM because you are trying to run too many applications concurrently or using applications that are extremely RAM dependent. It will improve the performance of applications that run mostly in RAM or when loading programs.
Currently Being ModeratedNov 5, 2013 10:57 AM (in response to zany.ninja)
Mavericks 10.9 seems to handle and manage memory very well. I would not try to second guess or micro manage the memory.MacBook Pro (15-inch Mid 2012), OS X Mavericks (10.9), i7 500GB 16GB RAM iPhone5 iOS7.0.3
Currently Being ModeratedNov 5, 2013 11:10 AM (in response to leroydouglas)
But it isn't always intuitively obvious, right Leroy?
Currently Being ModeratedNov 5, 2013 11:19 AM (in response to Kappy)
Mavericks seems to be doing a good job with memory and I've had fewer issues than with mountain lion, but if I were to buy a new Macbook *** today, I'd be strongly tempted to get 8GB instead of 4 GB - particularly if I was looking two-three years ahead.
Currently Being ModeratedNov 5, 2013 11:30 AM (in response to Kappy)
True, I don't fully understand the inner workings of mavericks memory management. But I do know that a sudden spike in memory pressure is not ideal. I also know that the lower the memory pressure reading, the better. And also that ideally a computer shouldn't have to use virtual memory/swap files.
So yeah, Kappy, I may not know what any of it means, but I do know that my Air's performance seems to take a slight hit when waking from sleep. And I do know that that is undesirable. And also I never had this issue using mountain lion. So I was wondering if anything can be done about it.
Currently Being ModeratedNov 5, 2013 11:45 AM (in response to zany.ninja)
sudden spike in memory pressure is not ideal.
Why? What is memory pressure? It's simply a measure of memory usage efficiency. A momentary spike is hardly significant of anything. In your case the spike indicates the moment when the system awakes from sleep using resources it no longer needs after which those resources are released. The spike accordingly drops.
ideally a computer shouldn't have to use virtual memory/swap files.
That is absolutely incorrect. Swap is frequently used except, perhaps, when you have 16 GBs of memory and are only using 4 GBs, so the OS can just swap to RAM instead of to disk.
Currently Being ModeratedNov 5, 2013 9:14 PM (in response to Kappy)
Ok, maybe I wasn't very clear. When I said spike, I meant sudden and sharp increase but without a drop soon after. The memory pressure reading nearly doubles after waking up from sleep, and stays there, doesn't go back down to the way it was after a restart. It doesn't double every time I wake from sleep, just the first time, and from then on is pretty steady.
But the swap used figure keeps increasing on every sleep-wake cycle. I haven't restarted in about 2 days, have had about 5 sleep-wake cycles, and the swap used is at about 500MB, even though memory used is at 1.7GB (ie I have 2.3 GB RAM free).
I have just been using the AIr for some light net surfing btw.
Currently Being ModeratedNov 5, 2013 9:44 PM (in response to zany.ninja)
Now that your question regarding memory usage has been addressed, if you are still experiencing laggy performance at times then you ought to fix it. Mavericks should perform exceedingly well on your MacBook Air. I've tried and failed to make Mavericks run poorly on a nearly identical MBA, so you ought to expect identical performance from yours. RAM usage is not likely to be the problem.
Post EtreCheck's results. You can find instructions in a multiple of Discussions on this site. It may reveal some helpful information.MacBooks iMacs iPads AirPorts, OS X Mavericks (10.9), 28 years Apple!
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