Linux speed test and benchmarking commands are tools I use are these
For cpu:
sysbench --test=cpu --cpu-max-prime=20000 run
For network:
wget -O /dev/null http://speedtest.dal01.softlayer.com/downloads/test100.zip
wget -O /dev/null http://speedtest.sea01.softlayer.com/downloads/test100.zip
wget -O /dev/null http://speedtest.ams01.softlayer.com/downloads/test500.zip
For Disk write speed:
wget http://speedtest.ams01.softlayer.com/downloads/test500.zip