Program that computes square matrix multiplication, C/C++ Programming

Assignment Help:

Goal:

Design a program that computes square matrix multiplication on GPU using CUDA. Write the code in C. In particular, your implementation should obey the following requirements:

1. The program must be general enough to handle matrix sizes beyond the GPU capacity.

2. The GPU capacity should not be hardcoded, but should be queried during execution.

3. The kernel implementation should be such that the execution configuration (number of blocks and threads/block) affects the performance but not the results of the kernel invocation.

Methodology

NOTE: In this lab, you will not use SHARED MEMORY!

The program will be tested on the workstations and the CUDA server using the following matrix sizes:

1. Use C++ compiler (g++) to compile your code, and use new operator instead of malloc() to dynamically allocate memory (malloc may fail on very large memory allocations).

2. Try to design the data structures so to minimize the number of memory transactions between host and device (CPU and GPU).

3. DO NOT START TO CODE IMMEDIATELY. Spend some time designing your solution.

i. How do you handle matrix sizes exceeding the GPU capacity?

ii. How do you represent the matrices?

iii. Which memory transfers are involved with matrices within and beyond the GPU capacity?

iv. When designing the kernel, which work is performed by each thread? How do you correlate each thread with the data it processes?

4. Kernel calls use shared memory and registers. Your kernel should not use shared memory. To see how many registers are used by each thread, you can have a look at the GPU assembly file.The assembly file (called PTX file) can be generated by calling:

nvcc -ptx myfile.cu

This will generate myfile.ptx.

The PTX file will show you the assembly representation of your kernel. In particular, it will show you the code execute by each thread (as you know, all threads execute the same code!). The PTX file will include an area where the registers are declared. For example:

.reg .u16 %rh<4>;//16 bit registers

.reg .u32 %r<9>; //32 bit registers

.reg .u64 %rd<10>;//64 bit registers

.reg .pred %p<3>; // registers used for predication

If you know: how many registers are used by each thread and how many registers are available on the GPU, you can easily determine what is the maximum number of threads that you can run (for your particular kernel).

5. Use the occupancy calculator to calculate the optimal point for configuring the kernel.

Questions:

1. Run your kernel with different number of blocks and of threads/block and see how this affects the performance. Report GPU occupancy and execution time, and discuss the results. Consider execution configurations that are trivially bad, and compare them with good execution configurations. How do you know in advance that some configurations are "bad"? And what is a "good" execution configuration?

2. What is the largest execution configuration that you can use without exceeding the resources available on the GPU in use?


Related Discussions:- Program that computes square matrix multiplication

Assignment, Programming Assignment # 1 C and UNIX   The purpose of this ...

Programming Assignment # 1 C and UNIX   The purpose of this assignment is to get you more familiar with Unix/Linux and those constructs of C that are not part of C++. Write a C

Assignment, Develop a C++ program that uses a while to determine the gross ...

Develop a C++ program that uses a while to determine the gross pay (in Dollars) for each of several employees. The company pays “straight-time” for the first 40 hours worked by ea

AREA UNDER CURVE, Write a program to find the area under the curve y = f(x)...

Write a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve between two points can b

Minimum shelf, #questionAt a shop of marbles, packs of marbles are prepared...

#questionAt a shop of marbles, packs of marbles are prepared. Packets are named A, B, C, D, E …….. All packets are kept in a VERTICAL SHELF in random order. Any numbers of packets

Define scope rules of c program - computer programming, Define Scope Rules ...

Define Scope Rules of C program - Computer Programming? The fundamental rule of scope is that identifiers are accessible only within the block in which they are declared and th

Working with files in cpp, Operation Files 2.1. Your program should open an...

Operation Files 2.1. Your program should open and read the file specified by the first command line argument of the program. 2.2. The first line of the file contains an integer

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd