Memory, Performance, Throughput

Owned by Paul McCullough (Unlicensed)
Last updated: Jun 14, 2017 by Samuel Valdez (Unlicensed)

For memory and CPU

top
iostat
vmstat
There's also an iotop, but I'm sure you'll find that PG is using most of the IO on a loaded db server.

For data throughput

You'll need a baseline for context.
iperf linux to linux)
ttcp (windows to linux)
whichever tool works between the source and destination. We don't need a super precise number to figure out what's going on. The difference between 80mb/s and 82mb/s isn't going to kill you, but if it's 80mb/s vs 8mb/s then you've got a problem.