This article presents an exercise on the use of Parallelware Analyzer to parallelize a simplified implementation of the LULESH benchmark using the OpenMP Common Core. It consists of the 16 most widely used constructs of OpenMP, the de facto standard for writing multithreaded code to take advantage of shared memory platforms. Parallelware Analyzer facilitates using […]
Technical
Parallelware Analyzer and the OpenMP Common Core: an exercise with PI
This article presents an exercise on the use of Parallelware Analyzer to parallelize an implementation of the computation of the PI number using the OpenMP Common Core. It consists of the 16 most widely used constructs of OpenMP, the de facto standard for writing multithreaded code to take advantage of shared memory platforms. Parallelware Analyzer […]
How to get started with Parallelware Analyzer: MATMUL example
In this blog post, we show how to get started with Parallelware Analyzer using a matrix multiplication example in C. You will see how to obtain actionable insights through optimization reports that help ensure best practices to speedup the code through parallel computing in vector, multicore and accelerator processors. A structured report displays the actionable […]
Flexibility and Performance: turbocharging loop unswitching
In the previous post we talked about loop unswitching: a technique that the compilers use to make loops faster. Loop unswitching consists of detecting conditional statements whose condition never changes during the execution of the loop (loop invariant conditions) and then moving the condition outside of the loop. Loop unswitching opens the door for other […]
Flexibility and performance: introduction to loop unswitching
Flexibility is very important in the development of software. A great deal of research and education is invested into creating flexible software. However, flexibility and performance don’t often come hand in hand, as most developers have already witnessed sometime in their developer’s careers. One of the ways to achieve flexibility is to parametrize the behavior […]
Many ways to speed up your program
There are many approaches to make your program run faster. Some approaches are based on using more efficient libraries, others rely on using the standard library and the language in an efficient manner. Other approaches include using more efficient algorithms. But sometimes, even after we’ve applied all the possible optimizations, the code performance is not […]
Speed up non-vectorizable loops with loop fission
Vectorization is a powerful technique for achieving peak computational performance. However, not all code is easily vectorizable by all compilers. In this post we are going to talk about vectorization of complex non-vectorizable loops. The idea is to split the loop into two loops, one for the vectorizable part and the other for the non-vectorizable […]
Trade a bit of precision for performance on hotspots with compiler vectorization directives
Most of the applications are fine when compiled with the -ffast-math compiler flag, which makes floating-point computations faster at the expense of some precision loss. However, in the scientific domain, floating-point precision is important so most of the time those codebases are compiled without this option. Still, the question of performance of such code remains […]
Run your floating-point calculations with both precision and speed
One of our customers has a mathematical simulation program where precision matters. We were given the code for evaluation and asked to make it run faster. They have a strict requirement that the source code is compiled without any optimization flags that can influence precision. Most compilers offer a fast-math compiler flag that significantly improves […]
Is your algorithm running at peak performance? The roofline model
There are worlds where performance matters. For example HPC world: faster software means less wait time for the scientists. Embedded world: faster software means we can use cheaper silicon to build our product. Game world: faster software means that our game will run on slower CPUs, thus making our game more interesting to people with […]