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14
1-4-scalability.md
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@ -70,6 +70,7 @@
- $$Efficiency = E = Speedup / n = 1 / ( \alpha \times n + 1 - \alpha )$$ - $$Efficiency = E = Speedup / n = 1 / ( \alpha \times n + 1 - \alpha )$$
- Efficiency is low, when load is large, because most nodes are idling (waiting - Efficiency is low, when load is large, because most nodes are idling (waiting
for serial computation to complete) for serial computation to complete)
- Also called **fixed workload efficiency**
### Gustafson’s Law ### Gustafson’s Law
@ -96,18 +97,23 @@
## Types of scaling ## Types of scaling
- Strong: How performances changes, by increasing **processors** for **fixed** problem - Strong: How performances changes, by increasing **processors** for **fixed**
- Weak: How the performance changes by increasing **processors** for **problem per processor** problem
- Weak: How the performance changes by increasing **processors** for **problem
per processor**
## Scalability in cloud computing ## Scalability in cloud computing
- Elasticity: resource can be altered - Elasticity: resource can be altered
- Virtualization scaling: adding existing system to cloud - Virtualization scaling: adding existing system to cloud
- Performance issues: Performance of virtualized components may be slower than bare metal - Performance issues: Performance of virtualized components may be slower
than bare metal
- Scale by migrating resources: Regions and Availaility Zones - Scale by migrating resources: Regions and Availaility Zones
- Region: physical geographical location, that consists of one or more zones - Region: physical geographical location, that consists of one or more zones
- Load balancing: AWS Elastic Load balancing, distributes incoming application - Load balancing: AWS Elastic Load balancing, distributes incoming application
traffic across multiple targets. traffic across multiple targets.
- Auto scaling: AWS EC2 auto scaling - Auto scaling: AWS EC2 auto scaling
- CDN: AWS CloudFront, use edge caching on edge location to serve content to anywhere closer to the vieweer, in order to achieve lower **latency** and higher **transfer speed** - CDN: AWS CloudFront, use edge caching on edge location to serve content to
anywhere closer to the vieweer, in order to achieve lower **latency** and
higher **transfer speed**
- TODO: work the questions - TODO: work the questions

1
2-4-aws-vpc.md
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@ -87,6 +87,7 @@
available available
- Possible EC **Instances**: Number of possible IP addresses minus **5** - Possible EC **Instances**: Number of possible IP addresses minus **5**
- AWS reserved the first 4 and last IP addresses (4+1=5) - AWS reserved the first 4 and last IP addresses (4+1=5)
- First and last: network address and broadcast address
- From the last example, there can be atmost $4096 - 5 = 4091$ instances in - From the last example, there can be atmost $4096 - 5 = 4091$ instances in
the network the network