Use the swap –l command to determine if your system needs more swap space.
For example, the following swap –l output shows that this system's swap space is almost entirely consumed or at 100% allocation.
$ swap -l swapfile dev swaplo blocks free /dev/zvol/dsk/rpool/swap 182,2 16 67108848 92
When a system's swap space is at 100% allocation, an application's memory pages become temporarily locked. Application errors might not occur, but system performance will likely suffer.