# Parallel Numerics at TU München

## Flashcards and summaries for Parallel Numerics at the TU München

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## Study with flashcards and summaries for the course Parallel Numerics at the TU München

### Exemplary flashcards for Parallel Numerics at the TU München on StudySmarter:

What happen's in Amdahl's Law when the number of processors tends to infinity?

### Exemplary flashcards for Parallel Numerics at the TU München on StudySmarter:

How to determine the flattening point in Amdahl's law?

### Exemplary flashcards for Parallel Numerics at the TU München on StudySmarter:

What does MPI_ANY_SENDER do?

### Exemplary flashcards for Parallel Numerics at the TU München on StudySmarter:

What is not synchronized in MPI terms?

### Exemplary flashcards for Parallel Numerics at the TU München on StudySmarter:

What does blocking in MPI mean?

### Exemplary flashcards for Parallel Numerics at the TU München on StudySmarter:

What are the three types of MIMD systems?

### Exemplary flashcards for Parallel Numerics at the TU München on StudySmarter:

What does MPI_Ssend() do?

### Exemplary flashcards for Parallel Numerics at the TU München on StudySmarter:

What does MPI_Rsend() do?

### Exemplary flashcards for Parallel Numerics at the TU München on StudySmarter:

What's an embarrassingly parallel problem?

### Exemplary flashcards for Parallel Numerics at the TU München on StudySmarter:

What's a race condition?

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## Exemplary flashcards for Parallel Numerics at the TU München on StudySmarter:

Parallel Numerics

What happen's in Amdahl's Law when the number of processors tends to infinity?

If the number of processors tends to infinity, the efficiency goes to 0.

Parallel Numerics

How to determine the flattening point in Amdahl's law?

Take the derivative respecting p

Parallel Numerics

What does MPI_ANY_SENDER do?

Allows to receive arbitrary messages, but makes the reception order of the messages also arbitrary.

Parallel Numerics

What is not synchronized in MPI terms?

Standard MPI operations are not synchronized: There is no handshake nor guarantee that they will ever arrive

Parallel Numerics

What does blocking in MPI mean?

Operation is not left until the used buffer is again available for reuse

Parallel Numerics

What are the three types of MIMD systems?

Shared memory: The processors share a common address space. They communicate by reading and writing to it.

Distributed memory: Each processor has a private address space. They communicate by messaging.

Hybrid: The nodes have a shared address space, but they communicate amongst them by messaging.

Parallel Numerics

What does MPI_Ssend() do?

It's a send that guarantees synchronous semantics (As long as the matching receive is blocking). This means that it won't return until the matching receive has been posted.

Parallel Numerics

What does MPI_Rsend() do?

It performs a send operation if matching receive has been posted, otherwise errors. It returns as soon as the buffer is available.

Parallel Numerics

What's an embarrassingly parallel problem?

Can be decomposed in parallel with virtually no need to share data

Parallel Numerics

Distribution of the work with the goal of keeping the processors busy at all times

Parallel Numerics

When two processors wait indefinitely for the results of each other

Parallel Numerics

What's a race condition?

Non-deterministic result of a program depending on the chronology of tasks in a shared memory machine

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