.NET Development Perf Testing in a Cloud VM (EC2)
If you haven't heard, Amazon's EC2 service provides cloud-hosted virtual machines. Initially, they just supported Linux machine images, but recently have allowed Windows machine images. This means that you can create on-demand hosted virtual machines accessible from anywhere.
I decided to do some simple, informal performance testing. To do development performance testing, I like to run a build process and time it, since compiling is typically the bottleneck on a development machine (other than the IDE and the developer).
I downloaded the source code for SharpDevelop, since I knew it would be a fairly large, yet automated build process. The only thing I needed to install was .NET 3.5 SP1. As a baseline, I ran the build on my personal laptop, with these specs: 2.0GHz Core 2 Duo, 3GB RAM, 250GB 5400RPM hard drive. To test the performance of the build, I ran it once, ran a "clean" operation, then ran the build a second time, timing it only on the second run.
- My laptop: 1 minute, 37 seconds
- EC2 Small Instance: 2 minutes
- EC2 Medium Instance: 41 seconds
As you can see, the EC2 "medium" instance, was over twice as fast as my local machine.
To continue my testing, I installed Visual Studio 2008 Professional, ReSharper, TortoiseSVN, and the Silverlight toolkit. My initial impression was very positive, and I could certainly see myself using it on a regular basis. From a professional standpoint, I would probably prefer a dedicated development machine. However, for an occasional hobby development environment, this might be a viable alternative.
- Can take snapshots of drives
- Doesn't use resources from your computer
- CPU can be upgraded/downgraded as needed
- Theoretically ultra-stable host
- Very fast Internet connection (I downloaded 800mb in less than 30s!)
- Theoretically updated virtual hardware as time goes on
- Potentially faster (especially if you use a laptop)
However, there are a few obvious disadvantages:
- Pay-per-hour can get expensive if you use it full-time
- Can't drag and drop in and out of the VM like desktop virtualization can
- Need to remote connect using something like remote desktop so graphics performance isn't the best
- Only available when you have access to the Internet
- Not necessarily great multi-monitor support
- Virtual machines take a while to start and snapshot
Right now, Windows based machines are priced starting at $.15/hr (medium for $.30/hr). For a machine that runs 24/7, this can get expensive compared to dedicated hosting. However, for a machine that's used for only a couple of hours each day, the pricing is very reasonable.
As an example, if you run a medium instance machine for 8 hours/day, 20 business days/month, you'll end up paying $48/month.
Having virtual, dedicated computers available on-demand for pennies per hour is very exciting. This is half of the cloud computing equation, and I believe it's going to be an important part of the future of the web.
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