Google today launched PerfKit, an open-source cloud-benchmarking tool that, in Google’s words, is an “effort to define a canonical set of benchmarks to measure and compare cloud offerings.” The PerfKit tools currently support Google’s own Compute Engine, Amazon’s AWS and Microsoft’s Azure clouds. Google says it has worked on this project with over 30 researchers, companies and customers, including ARM, Canonical, Cisco, Intel, Microsoft, Rackspace and Red Hat. As Google points out in today’s announcement, evaluating the performance of different cloud services isn’t easy. There are a few companies like CloudHarmony that offer cloud-performance reports (and tools like New Relic obviously let you monitor your existing installs), but none of these take your specific needs into account, and it’s often unclear how those tests were performed. Once installed, PerfKit runs about 20 benchmark tests that look at everything from raw CPU performance to more complex database and network ben...