I have a process that is reporting in 'top' that it has 6GB of resident memory and 70GB of virtual memory allocated. The strange thing is that this particular server only has 8GB physical and 35GB of swap space available.
From the 'top' manual:
o: VIRT -- Virtual Image (kb) The total amount of virtual memory used by the task. It includes all code, data and shared libraries plus pages that have been swapped out. (Note: you can define the STATSIZE=1 environment vari- able and the VIRT will be calculated from the /proc/#/state VmSize field.) VIRT = SWAP + RES.
Given this explanation, I would expect the virutal memory allocation for a process to be limited to my swap + physical memory available.
According to 'pmap', the code, shared library, and shared memory sections of this process are all minimal - no more than 300M or so.
Obviously, the machine and the process are still functioning correctly (albeit slowly), so what am I missing here?