The latest OS X Yosemite update has a surprising fix. Now I don't run out of memory anymore.
I ran out of memory on my iMac with 32GB RAM everyday. I work with 7 virtual desktops and regularly have 26 apps running. The main memory hogs are though the three browsers I use with dozens of tabs open on each. Firefox and Google Chrome use up the most RAM, while Safari stays modest. Running out of memory became so annoying that I was looking for a solution and found a little tool called Memory Clean (You can find the free tool in the App Store).
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Memory Clean allows me to free up RAM with a click of a button. This way I don't have to close apps or even reboot. With the this memory management tool the reboot frequency dropped to lower than once every two weeks or so. Memory Clean is not a fix, but helps a lot dealing with memory loss. Now after installing OS X 10.10.4 and running it for several days I can say that the running out of memory on OS X problem is gone.
At all times I have about 2GB of free RAM. Apple did not mention any specific fix in the memory management area in the OS X 10.10.4 release notes. This is kind of surprising as I consider this a major bug and it has been around for at least a year or two. I was actually blaming Chrome and Firefox for the memory issue, but apparently it was Apple's bug.
While I don't need Memory Clean anymore, I still run it so I can enjoy seeing the huge amount of free RAM i have right now.
Apple will has already released OS X 10.11 El Capitan as public beta. El Capitan main promise ins improving performance. It is possible that some of the memory related improvements already made it into OS X 10.10.4.
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OS X 10.11 will be released this fall. Read the OS X El Capitan details.