Function-as-a-Service (FaaS) brings to programmers significant advantages. 

However, FaaS deployments can suffer from issues that lead to lower application performance (throughput), namely when scaling up.

What techniques can be employed to improve application throughput as soon as more resources are needed to execute functions?

(select all the correct options).

Function-as-a-Service (FaaS) aims to improve on the delivery model provided by Infrastructure-as-a-Service (IaaS). One such example is AWS Lambda.

Identify the key aspects that occur in AWS Lambda deployments.

(select all the correct options).

BigTable offers developers tabular storage with scalability and aimed for high throughput in data access.

What is the BigTable design decision that contributes the most to making clients access the data fast (high throughput), in the typical use cases?

(select the option that best fits the question).

When deploying an application on the Google App Engine (GAE) PaaS, the developer can configure the automatic scaling of the application with application-defined scaling policies.

What is the most relevant parameter that affects the ability to respond quickly to spikes in request load?

(select the option that best fits the question).

The Constant Pool is a component of class files as described in the Java VM specification. 

The Constant Pool brings a number of advantages, such as:

(select the option that best fits the question).

When deploying instances in AWS, users can request elastic IP addresses.

What do elastic IP addresses allow?

(select the option that best fits the question).

In the Java VM specification, switch/case instructions can be compiled/encoded into bytecodes in two alternative ways.

In the following example of Java code, what would be the most appropriate way to compile/encode the switch/case instruction into bytecodes.

switch (x) {

           case 999:  return 1;

           case 1000:  return 0;

           case 1001:  return 1;

           default: return -1;

}

(select the option that best fits the question).

Despite the many advantages Cloud Computing brings, it also entails some potential fragilities or challenges to users. Give examples of such potential fragilities or challenges identified.

(select all the correct options).

Nova sheduler is the component in OpenStack that is responsible for launching instances (virtual servers) and deciding in what physical machines (hosts, nodes) they should be launched.

The built-in scheduler is the Filter Scheduler. It is parametrizable and operates in phases: i) gathering state of all compute nodes; ii) finding suitable hosts; iii) choosing the best nodes.

Consider a scenario where the developer wants to launch a VM instance that requires that requires:

- 4 VCPUs and 

- 4 GB of memory 

Furthermore, he/she wants to employ a consolidation policy (i.e. attempt at making the new VM instance and any VMs already in execution fit into as few hosts as possible, regarding CPU and memory in a equally balanced way).

How can the custom filters and weights of this algorithm be parametrized/configured in order to achieve these goals ?

(select the option that best fits the question).

In the context of the conditions for ISA virtualizability, consider an hypotetical ISA including the following exemplificative instructions as described:

- Inst_A : this instruction can only be executed in system mode, otherwise traps.

- Inst_B : this instruction retrieves the global wide state of hardware resources.

- Inst_C : this instruction allows to take control of the CPU scheduling timer.

- Inst_D : this instruction performs arithmetic multiplication of two registers.

Considering only what you can infer from the presented information about instructions Inst_A, Inst_B, Inst_C, Inst_D, identify which of the following sentences is/are corrrect.

(select all the correct options).