I'd like to analyze the CPU load history to measure the efficiency of our algorithms. What is the best way to track CPU load % on a SGE cluster in GCE? Google cloud console tracks it, but does not make it downloadable as far as I can tell. SGE tracks load internally but it seems rather basic. My guess is Ganglia will be the route to go.
Consider using Google Cloud Monitoring API which was recently released to track CPU load in your instances.