STREAM is a memory bandwidth testing program that came from testing high-performance systems for scientific research. The program is hosted at http://www.cs.virginia.edu/stream/, and the website includes a variety of sample reports from the program, too.
The STREAM project provides some binaries for several platforms, even Windows, although the available Linux binary hasn't worked out well in my own testing. In addition, STREAM aims only to track the maximum bandwidth the system is capable of. You can find some benchmarks at https://www.cs.virginia.edu/stream/peecee/Bandwidth.html.
One of the things that you should be interested in for PostgreSQL use is how much memory bandwidth a single process can reach. If you are ...
