You can easily monitor your Linux server load using built-in bash commands like

w

free

top

However, many folks prefer sysstat package (can be downloaded here, or from your Linux distribution site) package that provides even further performance monitoring utilities:

iostat

sar

vmstat

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Login into your Linux server shell and execute the above commands. iostat, sar, vmstat can be run like

vmstat 1 10

where 1 is the time between monitoring load, 10 is the count  how many times the data need to be read.