man page for ps:
Quote:
STAT
(s, u, and v flags) Contains the state of the process:
0
Nonexistent
A
Active
I
Intermediate
Z
Canceled
T
Stopped
K
Available kernel process
If the process has memory problems it would bounce to the limits for memory set by the ulimits for the user that started the process.
Nevertheless you could check with vmstat easily if your box has memory problems overall.