Dunno what it is Go look at this. Advantages, in my case, are obvious, and, so far, with no issues at all.2006 Macbook. I don't recommend doing it in previous OSX versions, or if don't want to take risks. It involves disabling the dynamic pager daemon and stop using virtual memory at all in Snow Leopard. This hint is the result of an experience I tried in the last few days. While I am aware that you can still download and install Server Admin Tools 10.6.8, even on the client versions of Mac OS X 10.6 Snow Leopard, currently, my only Intel Mac is running a highly customized version of Mac OS X 10.6 Snow Leopard, and I am unable to check for myself (or I would) if the Mac OS X 10.6 Server Snow Leopard Server package is available for sale and download or not through.
Os X 10.6.8 Care For Upgrade To TheThis version of Apples OS also has a reduced footprint. This update does not have stacks of new features, rather overall improvements and efficiency upgrades. Now, I need 10.7.Mac OS X 10.6.8 Snow Leopard is an upgrade to the previous version of OS X Leopard.I suspected the paging activities of OSX to be responsible for the general system slowdown. But even with the MBP, some slowness seems to sometimes appear in everyday usage (Parallels 6/Windows7, Firefox, Photoshop, Mail, iTunes always opened), specifically related to the disk activity (a 5400 RPM 320 GB, Hitachi drive). Upgrading to Snow Leopard.My MacBook Pro, Core i5, 4 GB RAM, 320 GB HD, has been a real pleasure to use my previous machine was an old PowerBook G4, as slow as you can imagine.As soon as I disabled the dynamic pager daemon, I restarted and notice a huge difference on how fast any application opens, that Windows 7 (in Parallels) reacts almost natively, and how the whole system now feels so much more responsive. In Terminal, type this line and restart:Sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.dynamic_pager.plistTo re-enable it, just repeat above command with the 'load' option.The difference for me was quite impressive and immediately perceptible. To disable it, the solution is quite simple. Last week, I discovered this page at OSXDaily.com, where virtual memory is shown to be easy to disable in Snow Leopard. New Added full support for Mavericks tagging Implemented smart folders with auto update Improved.Meanwhile, I've been trying to minimize disk swap activity. So one move I planned was to buy a 7200 RPM drive, or even better, an SSD drive.Mac OS X 10.6.8 or later required Application Updates. There was still no panic, no issues. I tried running some PC game demos in Parallels/Win7 (with 2 GB RAM allocated). Win7 launches in about 20 secs, even Firefox opens and responds much faster than before.No swap files in Private/var/vm, 0% cache hits and about 800-900 MB RAM still free (3 GB used) during peak usage.I can testify that, after a week of tests, having opened as much as 30 simultaneous applications (in fact all the Apps folder), I have notice no slowdown, no bug, no kernel panics, no unusual log file error reporting. Active and inactive memory can be re-created from the files on disk (temporary store for the UI images, etc), so the system can purge the active and inactive pages, and reload from disk later.This is all find and dandy, until you start a virtual machine. It's data that can't be re-loaded from disk. Normally the "wired" memory is quite small, it holds things things like the contents of a text document, the current page in Safari and so on. The MBP is okay, except faster than before (and even faster when waking from sleep).So, if you have OSX 10.6 with as least 4 GB RAM, disable your virtual memory and rediscover your Mac.This is quite a 'dangerous' hint, in regards to system stability.If the system needs to increase the "wired" memory, and runs out of active, free and inactive memory, it WILL crash. ![]() I keep an eye on the memory usage (with iStat menus) so this doesn't happen.I was having a real speed problem with memory and parallels, specifically, when you exit a specific parallels VM, the memory is marked "inactive" and not "free". If you've only got 4gb, and the system uses it all for wired memory, it'll lock up. I wouldn't recommend disabling virtual memory with less than 6gb, as the system can quite easily swallow up 4gb of wired memory, especially with Photoshop and Win7 in a virtual machine. The system will lock up, and a hard reset will be the only option.I disabled virtual memory on my 2006 Mac Pro when I got a SSD, but it's got 8gb RAM so has plenty to play with. Not real sure.My solution was to monitor my memory in activity monitor, and when I was out of green/free, I would open up terminal, and run 'purge'. I "think" that when you are out of free memory, and open something new, the inactive memory is then paged. I dont care what everyone says about "free" being the same as inactive, it is NOT the same. It adds up very quickly.As soon as the system was out of "free" memory, EVERYTHING ran like dog crap. So the more virtual machines that you open and close, the more inactive memory you will have. Download visual studio for mac 71If you do not wish to do that monitoring, then you should not disable VM (as other commenters suggest as well). If one can monitor carefully his usage and keep it well under the amount of real memory, this hint is very rational. So, while it is less likely to crash due to running out of memory, it is FAR from impossible. This is certainly untrue as the real memory + swap can also run out depending on how much space you have on your disk. It is not ideal, use at your own risk, but I hate rebooting, so it worked for me very well.I know this is only half related to the post, but i am mentioning because if you are going to investigate turning off paging, you should know about inactive memory and purge as well.Many of the comments about how dangerous it is to disable virtual memory suggest that it is impossible to run out of memory with VM on. Actually I was expecting that (but I love to make experiments), so I shut off the macbook pro pressing the button for two seconds, and then I rebooted. That was a real bummer but long since fixed in modern linux look alikes such as MacOS.I think this trick could work if you are lucky enough.I did it: yesterday I disabled the virtual memory and checked the memory usage in real time with menumeters during an afternoon of work with xcode in iOS programming.The wired memory kept to fill up the total memory available (8GB), and I didn't notice any speed bump, but I have an SSD, so I'm not sure, because memory swapping with an SSD could be fast enough to make the system sufficiently snappy on its own.After some hours (3 or 4) the memory was completely full, and the system didn't crash: it simply stopped to work, I couldn't do anything, no kernel panic but the macbook pro was freezed. Note that on the old Solaris systems, you needed at least as much swap as real memory or you could not use the real memory. In fact we usually keep very little swap space because we do not really ever want to spill over into swap anyway. In my experience with linux this does not seem to be an issue. If the system is swapping when there is plenty of real memory it seems like there is a serious kernel bug. Also, mail asked me again for all the account and passwords.I don't know exactly what happened, but I suggest to NOT disable the virtual memory.
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