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Why is iftop using so much memory? Are there any tools that are powerful, but do not use so much memory?

pmap iftop_id b7fce000 4K rw--- /lib/ld-2.5.so bf9aa000 84K rw--- [ stack ] total 204940K The memory of the server is only 1GB, but iftop takes 204MB. It is crazy that iftop uses ...