Recently we benchmarked a dedicated GoDaddy server against an Amazon EC2
instance and $ for $ the GoDaddy server was about 30% faster. Here
are some stats:
Godaddy Dedicated Server
2 GB memory
Processor: Intel Core 2 Duo - 2.13 GHz
32-bit platform
Raid: None
$146 per month
UPDATETEXT ... - Took 116ms
SLIDEHANDLER3 ... - Took 2722ms
Amazon EC2: High-CPU Medium Instance
1.7 GB memory
5 EC2 Compute Units (2 virtual core with 2.5 EC2 Compute Unit each)
32-bit platform
I/O Performance: Moderate
Instance Type name: c1.medium (used in EC2 APIs)
Price: $0.20 per instance hour
$144 per month
UPDATETEXT ... - Took 144ms
SLIDEHANDLER3 ... - Took 3525ms
Conclusion: So unless you need proximity to Amazon S3, scalability, ...
you are better off with a dedicated server than an instance in the
cloud.
Digital Twin are an online representation of a real world object, a copy of its properties in the digital world and a way to send updated and commands to it. In effect I've been making them for years but now they have a trendy name.
Why automated learning is hard for a smart home. The perils of over-fitting, under-fitting and how the general unpredictable nature of life makes it hard to build a system that learns your behavior.
One way to reduce the volume of sensor data is to remove redundant points. In a system with timestamped data recorded on an irregular interval we can achieve this by removing co-linear points.
Home automation systems need to respond to events in the real world. Sometimes it's an analog value, sometimes it's binary, rarely is it clean and not susceptible to problems. Let's discuss some of the ways to convert these inputs into actions.
Another super useful function for handling sensor data and converting to probabilities is the logistic function 1/(1+e^-x). Using this you can easily map values onto a 0.0-1.0 probability range.
In a home automation system we often want to convert a measurement into a probability. The ATAN curve is one of my favorite curves for this as it's easy to map overything onto a 0.0-1.0 range.
Several years ago we did a major remodel. I did all of the finish electrical myself and supervised all of the rough-in electrical. I also put in all of the electrical system and water in our barn. I have opinions ...
