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(this will show you the running services with the amount of CPU and memory utilized)
it will show you services using maximum memory
it will show you services using maximum CPU
This will show you statistics of your CPU and memory
this will show your RAM size and swap memory both free and used
or if you want to download additional tool then look for "collectl"
I think sar is part of the sysstat package in centos and fedora. I use that to keep history on the servers. Keep in mind that it will only keep history from when you install it and it will only keep 7 days by default if I recall correctly.
SAR saves a month's worth of data in a continuously rolling set of files with the day of the month in their name. Only problem is by default it only samples once every 10 minutes which is pretty useless. At least change it to a minute or even less.