EXCEEDING MEMORY SPACE
As with any Linux* system, the operating system on the coprocessor will sometimes allow you to allocate more memory space than is physically available. On many systems this is taken care of by swapping some pages of memory out to disk. On those systems, if the amount of physical memory plus the amount of swap space is exceeded, the operating system will begin killing off jobs.
The situation on the Intel Xeon Phi coprocessor is complicated by the lack of directly attached disks. So: