mem
goal
monitor the memory use (RAM and swap)
units
all is in percents of total memory (or swap)
parameters
programs
it is the percentage of memory used by programs
shared
it is the percentage of shared memory used (ipc)
buffers
it is the percentage of memory used by buffer
cached
it is the percentage of cached memory used
free
it is the percentage of available memory
swap
it is the percentage of swap used
more info