December 2013
Beginner to intermediate
304 pages
7h 20m
English
Content preview from OpenCL Programming by ExampleBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Case study – Histogram calculation
In the section Histogram calculation in Chapter 3, Buffers and Image Objects, we discussed about the naive implementation of histogram computation of an image. We read an input image file and pass the pixel buffer to the OpenCL device to compute the histogram of the image. By now you must have observed that this implementation is not so optimized which involves sequential reads. In this section we will try to optimize this implementation by making use of atomic_inc OpenCL C built-in and make use of coalesced reads and writes to the global and local memory. Take a look at the following kernel:
#define BIN_SIZE 256 #define ELEMENTS_TO_PROCESS 256 __kernel void histogram_kernel(__global const uint* data, __global ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.