process memory consumption
 

from which command we can know that which process is eating how much of memory not in percentage but exactly in figures (kb,mb) cause ps command show in percentage

Look in /proc/PID/status. VMSize is the total mapped virtual memory. Generally, you should subtract VMLibs (library size) from this to find out how much memory it has consumed by itself. And in the future, please try to use complete single sentences... it makes it much easier for us to understand your questions.

ps -A u
Look at VSZ

pmap



Cheers,
Tink

Or that. Nice call, tink.

Or "top", check out this thread.