This is true in theory, but in practice, this concern is generally overblown, and left over from the days when SSDs had far less longevity.
Modern SSDs should last a good long time, even with features like this enabled. Leave virtual memory be and allow your Mac to work as it was designed to. The Best Tech Newsletter Anywhere. Join , subscribers and get a daily digest of news, comics, trivia, reviews, and more. Windows Mac iPhone Android. Smarthome Office Security Linux. News Features Reviews. The Best Tech Newsletter Anywhere Join , subscribers and get a daily digest of news, geek trivia, and our feature articles.
Full open firmware protection will not protect your computer from this if the attacker has physical access to the computer it can be quickly bypassed. The Solution: For those of you that are paranoid or require a more secure system environment, the solution is turn swap off entirely. This will slow down your machine when doing processor-intensive tasks, but otherwise should be fine.
I haven't tested this one, and I think it may have an impact during memory -intensive tasks, not necessarily processor -intensive tasks as written above. Swap is an integral part of OS X, and I do not recommend disabling it. For instance, if you use up all available physical RAM, what happens when there's no swap available? Perhaps someone can chime in in the comments, but I believe your machine could lock up.
Once again, I don't recommend doing this, but if you'd like to know how, read the rest of the hint. Type the following, hitting Return after each command. Use the arrow keys to go down until you see one of these lines: In osx Type exit -- this logs you out of the Terminal session. Now delete the old swap files securely.
The swap files are named: You should see no files named: Original BugTraq posts 1 , 2 describing the security problems and how to exploit them.
Info on moving swap and how swap works Disclaimer: Turning your swap off may cause problems when trying to do functions that require large amounts of memory, resulting in your system freezing. The following comments are owned by whoever posted them.
This site is not responsible for what they say. Warning Authored by: Elian on Aug 12, '04 I really wouldn't do this unless you actually need to test what happens when the system runs out of memory like if you're stress-testing an application you're writing [ Reply to This ]. Auricchio on Aug 12, '04 Tempest is for NON-physical access Authored by: Authored by: GaelicWizard on Aug 12, '04 JP Pell [ Reply to This ]. This is why In the meantime you can use PGP disk Authored by: PGP disk works great but Arif on Aug 12, '04 Turning off the VM to enhancing performance?
OK - security issues asside, I'd like to know a little about VM performance. You do have backups, right? Steve [ Reply to This ]. Some research and testing into an encrypted swap set up is currently underway: Tiger's OS X So, no switching of the virtual memory system is needed anymore.
I haven't tried the encryption option yet, so I can't tell how much system performance degradation this introduced it sure must Antirty on Jan 18, '09 Search Advanced. From our Sponsor Latest Mountain Lion Hints Click here for complete coverage of Lion on Macworld. User Functions Username: What's New: Hints 1 new Hints in the last 24 hours Comments last 2 days No new comments Links last 2 weeks No recent new links. What's New in the Forums?
How to Disable Swapfile MacOs (Mac OS X) | Asylab | Home
Nano 7 - backgrounds This directly also contains your sleepimage file, which is essentially what your Mac has been storing in memory prior to system sleep. Anyway, back to swap files in the same directory: You can see them for yourself with the following command:. I would highly recommend against modifying how Mac OS X handles memory management and swap files. In the Terminal, enter the following command.
This will unload the dynamic pager from the Mac OS X kernel:. Again, this completely disables the Mac OS X paging ability, do not mess around with this for fun. Your next step would be to remove the swapfiles that are currently stored, they are generally pretty large it is your virtual memory after all and take up a fair amount of disk space.
Enjoy this tip? Subscribe to the OSXDaily newsletter to get more of our great Apple tips, tricks, and important news delivered to your inbox! Enter your email address below:. It will barely make a difference on the life of your SSD, and Mac OS does much better when you allow it to use swap space as it wishes. Thanks for the article. Can anyone tell me if we can delete previous swapfiles? Thus there is no way to explicitly — and also no need to — increase the amount of VRAM.
If you find you are in need of serious amounts of swap the best option for you will be to increase your amount of physical RAM. Or take a serious look at how many programs you have running. You can improve the performance in several ways: Very interesting post.
As the harddrive gets full, the sluggishness becomes more and more noticeable. Or there is a way to format it for swap? Next step: Will a symbolic or hard link suffice? More important: Size of physical memory in bytes plus swap files? And also: How does OS X keep track of the location of information in the swapfiles? Any help out there? Mac OS X and virtual memory. Anytime you can avoid using virtual memory your Mac will perform faster since it does not need to […].
Snow Leopard This will unload the dynamic pager from the Mac OS […]. How can we tell if this worked?
How To Disable Virtual Memory In OS X
I just read this article and the majority of posts and all I can say that it is extremely bad advice to turn off your swap space. To be blunt, this is a very stupid idea. The entire operating system is built around the idea of a backing store for RAM — that is basic Operating System Design Memory allocation and deallocation use some fairly complicated algorithms to provide low-latency response to having multiple applications loaded, run, and then deactivated.
Having a very small amount of RAM e. The more apps one runs, the worse the situation becomes. Your system will literally crawl or wedge. Disks are cheap and althought not as fast as RAM, it will not slow your system to a crawl. If you are worried about killing your SSD, you have two choices: To be honest, the likely hood of destroying your SSD is very slim.
Especially OS operations like browsing around in folders with hundreds or thousands of images in each.