StressRobo is a tool for developers.
Run out of memory as much as possible of Android, StressRobo attempts cause Low Memory state only for a moment. Low Memory since it is recognized state, allocated memory is released immediately.
Comes less memory, Android OS, and kill unnecessary processes by certain logic.
Because the behavior is caused by StressRobo, available memory seems to have gained a moment.
That, even in a state Low Memory of Android, the goal is to make sure whether the intended behavior (service in particular) application you are developing.
Docomo Xperia is a test machine (Android2.1 update1).