bench: more system data

[bukzor]

openbenchmarking.org does a good job of recording system specs as benchmark metadata. http://openbenchmarking.org/result/1405134-PL-AIOLAPTOP47

I'd like to do the same for our benchmarks. Either transliterate their code to python (if it's simple enough) or vendor the php.
https://gitorious.org/phoronix/phoronix-test-suite/source/master:pts-core/objects/phodevi/components

Then we'd try to get benchmarks from a particular machine (type) into separate folders. They'd be named either by a hash of the system data, or some more human-readable subset of the system data. I'd really like to get to a place where we can detect regressions on travis, at least when we hit previously-seen hardware.

The long-long-term goal would be some kind of benchmarking-helper library that we could use both in cheetah and other performance-sensitive projects.

[bukzor]

These will be helpful:

• https://docs.python.org/2/library/platform.html
• https://code.google.com/p/psutil/

[bukzor]

See also:

• [Feature Request] Continuous Performance Testing in travis-ci travis-ci/travis-ci#352 (comment)
• https://www.dartlang.org/performance/
• http://openbenchmarking.org/opc/1405134-STEF-WINE17162