The virtual memory sizes are in 1024 byte units. Which will display the virtual memory used sorted so the largest virtual memory consuming users are at the end. You can also issue the following command from Applications -> Utilities -> Terminal: ps ax -o vsz,pid,comm | sort -n If you look at Applications -> Utilties -> Activity Monitor -> View (menu) -> All Processes -> Memory (tab), you can see what processes are using lots of memory. Generally, if there is a memory leak (process asks for a virtual address range, uses the addresses, forgets to give them back, asks for another virtual address range, uses the addresses, forgets to give them back, wash, rinse, repeat), eventually there are so many virtual memory page table entries trying to keep track of the virtual addresses, that macOS no longer has memory available for applications, and you get the ' Your system has run out of application memory'. Virtual memory address space requires macOS to create Virtual Memory Page Tables in the kernel address space to keep track of the application virtual addresses given out. This is generally not the case, but I mention because if you do have very low free storage, it might apply.ī) A process (or set of processes) have asked macOS for excessive amounts of virtual memory address space. If you are getting ' Your system has run out of application memory' dialog boxes, and a list of most likely innocent apps listed, then here is the explanation.įor the record, there are 2 reasons for the ' Your system has run out of application memory' dialog box.Ī) Your boot disk has very low free storage, and macOS cannot create page/swap files to offload virtual memory contents to disk.

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