Оптимизация? Конечно, каждый сталкивался с данной задачей при разработке своих, сколь-нибудь значительных, требующих определённых вычислений, приложений. При этом способов оптимизировать код существует огромное множество, и, как следствие, различных путей сделать это в автоматическом режиме с помощью опций компилятора. Вот здесь и возникает проблема – как выбрать то, что нужно нам и не запутаться?
I'm new to cilk, and i wanted to ask if it has an implicit threshold for the task creation, in recursive computations like fib?
If so, is it based on the number of tasks created, or in the depth of the computation?
The latest Intel® Xeon® processor E7 v2 family includes a feature called Intel® Advanced Vector Extensions (Intel® AVX), which can potentially improve application performance. Here we will explain the context, and provide an example of how using Intel® AVX improved performance for a commonly known benchmark.
For existing vectorized code that uses floating point operations, you can gain a potential performance boost when running on newer platforms such as the Intel® Xeon® processor E7 v2 family, by doing one of the following:
I have code that is structured like this:
I'm having difficulty running a simple test case using cilk_spawn. I'm compiling under gcc 4.9.0 20130520.
The following fib2010.cpp example, executes in 0.028s without cilk and takes 0.376s with cilk as long as I set the number of workers to 1. If I change the number of workers to any number greater than one, I get a segmentation fault.
I'm having difficulty comparing cilk_for with cilk_spawn. The following cilk_spawn code executes as I expect for command line arguments like 1000000 30
I have the loop, inside its body running the function with array member (dependent on loop index) as an argument, and returning one value. I can parallelized this loop by using cilk_for() operator instead of regular for() - and it is simple and works well. This is explicit parallelization. Instead of explicit loop instruction I can use Array Notation contruction (as shown below) - it is implicit loop. My routine is relatively long and complecs, and has Array Notation constructions inside, so it cannot be declared as a vector (elemental) one.
I want to build the trunk on an embedded system supporting armv7 instructions. The build was accomplished without errors but cilk/cilk.h and libcilkrts weren't built. I checked out the patches available on the internet they do support non x86 architectures but I think just i386 not arm.
Are there other patches or config options to add while building so that I get those libraries along with the build
I was wondering if it is possible to create an array of reducers in C?
I already read the documentation, but they use always only one reducer. However, how do I use Cilk reducers for an array with int or double values? Can you give me a short example?
Thanks in advance.
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