Memory monitoring

Hi ,
in Milestone 1-On htop while the file is being transferred CPU% and MEM% change
but VIRT SHR & RES columns remain same .
So how should i monitor the memory change and which of VIRT SHR or RES , should i monitor? Also should i monitor vsftp or ftp ?
Please do help…stuck on this for a long time.

Thank You!

Anybody found an ans?

See memory change in RES

Monitor ftp process as it is doing the file transfer

My vsftpd server is running and I can check it using ps and netstat commands but in htop I am not able to see vsftpd process, what should I do ?