profiling memory usage

[NOSHII]

> Hi,
>
> I am looking for a method to profile memory usage in my python program.
> The program provides web service and therefore is intended to run for a
> long time. However, the memory usage tends to increase all the time,
> until in a day or two the system cannot handle it any more and starts
> to do constant swapping. Is there a way to look at which objects or
> variables are taking the huge amount of memory space?
> 
> Thanks,
>