Fiinding size (or percent) of memory a thread occupies

Hello,

1)The top command  shows the memory of a process and all its threads as if 
they
were all using the same size of memory ; which is probably so;
I have a process with some (5) threads and I want to know how much memory
each thread occuupies; top is not good (it dispalys the same percentage of 
mem use to all)
Can it be done ?

2) Is there a goof tool for profiling cpu usage (to see where the 
application spents most of it's
time?)

regards,
sting

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