Parallel-Computing

This repository was made to store and guide my studies about parallel computing using CUDA

Table of Contents

• Parallel Communication
• Learning About GPU and CUDA

Parallel Communication

Parallel Programmming Paradigm requires
some special communication design between GPU threads.

• MAP (One-to-One)
  • This pattern compute each data given by the host and write some result for each data in different memory addresses.
• Transpose (One-to-One)
  • Reorganize structure of the data storage inside memory
• Gather (Many-To-One)
  • This pattern compute a set of data given by host and generate a single result on each thread.
• Scatter (One-To-Many)
  • This pattern compute some data given by host and write and same result in different memory addresses.
• Stencil (Several-to-One)
  • Like gather pattern, this pattern get a set/struct of data given by host,compute and write result in a single memory address.

Leaning About GPU and CUDA

GPU Hardware

• In high level, GPU is a bunch of Streaming Multiprocessors (SM)
• GPU is responsible to allocate blocks of SM's
• An SM may can run more than one thread block
• Some thread block can't be executed on more than one SM
• Have 3 types of memory inside of an GPU (local memory, shared memory , global memory)
• Only each thread can acess data stored in their own local memory
• Only all threads of some block can acess their own shared memory
• Every thread in every block can acess data in global memory

GPU SM's Design

GPU Memory Design

CUDA Guarantees

• A thread block is a group of threads that cooperate to solve a sub-problem
• All threads in a block run on the same SM at the same time
• All blocks in a kernel finish before any blocks from the next kernel run