Add profiling to influxd

[benbjohnson]

Overview

This pull request adds -cpuprofile and -memprofile to influxd

Usage

To use profiling, run:

$ influxd -cpuprofile /tmp/cpu.prof

Then run stuff against InfluxDB and hit CTRL-C on your server to stop it. Then run pprof through the Go tool chain:

$ go tool pprof $GOBIN/influxd /tmp/cpu.prof
Entering interactive mode (type "help" for commands)
(pprof) 

I mostly use the web command which generates a call graph in SVG and pops it into your browser. There's a bunch of cool options though.

[toddboom]

👍