DaD Quiz

How JMS- Jakarta/Java EE Messaging Service is different from RPC/RMI (Remote Procedure Call/Remote Method Invocation)?

• In RPC the method invoker waits for the method to finish execution and return the control back to the invoker. Thus it is completely asynchronous in nature. While in JMS the message sender just sends the message to the destination and continues its own processing. The sender does not wait for the receiver to respond. This is also synchronous behaviour.

• In RPC the method invoker waits for the method to finish execution and return the control back to the invoker. Thus it is completely asynchronous in nature. While in JMS the message sender just sends the message to the destination and continues its own processing. The sender does not wait for the receiver to respond. This is also asynchronous behaviour too.

• In RPC the method invoker waits for the method to finish execution and return the control back to the invoker. Thus is completely synchronous in nature. While in JMS the message sender just sends the message to the destination and continues its own processing. The sender does not wait for the receiver to respond. This is asynchronous behaviour.

• None of the existing answers

Which of the following statements/conclusions is NOT true in light of Amdahl's law used to measure parallel processing performance?

• Parallelizing 95% of the solution and using a number of 1000 processors/cores simultaneously, the execution time is theoretically a maximum of 20 times shorter than the duration of the sequential solution.

• The performance of parallel processing is dependent on the parallelizable portion of the code and the number of processors/cores.

• Increasing the number of processors does not automatically mean a significant decrease in processing time for non 100% parallel solutions.

• All problems could be parallelizable and the performance is directly proportional to the number of processors/cores used.

In OpenMPI, what is printed by the process 0?

• me : 0, them : 1

• me : 0, them : 1 OR me : 0, them : 8

• me : 1 them : 0 OR me : 0, them : 8

• me : 1 them : 0

If we consider 2 vectors with values, X and Y, and the next sequence (pseudocode) that we want to execute in parallel : **S = 0; for (i = 1; i < 1000; i++) S = S + X[i] + Y[i];** What is the type of problem you will face in implementing the parallel solution?

• The sequence cannot be executed in parallel because each iteration depends recursively on the previous interactions

• Parallel thread synchronization issues

• Loop dependencies

• Race condition issues

In OpenMPI, what is the purpose of a message tag?

• To indicate the type of message

• To count the number of characters in a message

• To provide a mechanism to differentiate between message-passing routines written by different programmers

• To provide a matching mechanism differentiating between message sent from one process to another process

Which of the following statements is NOT a parallel form/type of processing?

• Bit level parallelism

• RAM memory parallelism

• Instruction level parallelism

• Task-level parallelism

Which of the following statements about OpenMP Is NOT correct?

• The main components of OpenMP are the compiler directives, the run-time library and the environment variables

• OpenMP is an API that allows the implementation of explicit parallel solutions with multiple threads

• OpenMP is designed for parallel systems with distributed memory and guarantees efficient memory usage

• OpenMP supports UMA and NUMA architectures

What statement is true taking into account the following Jakarta/Java EE source code in terms of JMS - Java Messaging Service API?

• The client program consumes/receives messages from a Java EE server queue and it is breaking the while loop if and only if receives a non-text message

• The client program consumes/receives messages from a Java EE server queue and it is looping forever

• The client program consumes/receives messages from a Java EE server queue and it is breaking the while loop if and only if receives a text message

• The source code is not compliant with JMS API

What are the different types of messages available in the Java/Jakarta EE JMS API?

• Message, TextMessage, BytesMessage, StreamMessage, ObjectMessage, ListMessage

• Message, TextMessage, BytesMessage, XMLMessage, ObjectMessage, JSONMessage

• Message, TextMessage, BytesMessage, StreamMessage, ObjectMessage, MapMessage

• Message, TextMessage, BytesMessage, CBORMessage, ObjectMessage, JSONMessage

In OpenMPI, when does the routine MPI_Recv() return?

• After a time specified in the routine

• After the arrival of the message the routine is waiting for and the data collected

• Never

• Immediately

• After the arrival of the message the routine is waiting for, but before the data has been collected.