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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 so much memory. So why does iftop use so much memory? Are there any tools that are powerful, but do not use so much memory?

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