Single Threaded: Summation of a Vector

What is the fastest way to add the elements of a std::vector?. A question which I will pursue in the next posts. I use the single-threaded addition as the reference number. In further posts, I discuss atomics, locks, and thread-local data.

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Tags: atomics, lock
Views: 25415

Thread-Safe Initialization of a Singleton

There are a lot of issues with the singleton pattern. I'm totally aware of that. But the singleton pattern is an ideal use case for a variable, which has only to be initialized in a thread-safe way. From that point on you can use it without synchronization. So in this post, I discuss different ways to initialize a singleton in a multithreading environment. You get the performance numbers and can reason about your uses cases for the thread-safe initialization of a variable.

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Views: 325702

Ongoing Optimization: Relaxed Semantic with CppMem

With the relaxed semantic, we have no synchronisations and ordering constraints on atomic operations.

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Views: 10874

Ongoing Optimization: A Data Race with CppMem

But we can do better and further improve the acquire-release semantic of the last post. Why should x be an atomic? There is no reason. That was my first, but incorrect assumption. See why?

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Views: 10937

Ongoing Optimization: Acquire-Release Semantic with CppMem

With the acquire-releae semantic, we break the sequential consistency. In the acquire-release semantic the synchronization takes place between atomic operations on the same atomic and not between threads.

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Views: 12344

Ongoing Optimization: Sequential Consistency with CppMem

With atomic data types, you can tailor your program to your needs and therefore optimize it. But now we are in the domain of the multithreading experts.

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Views: 12884

Ongoing Optimization: Locks and Volatile with CppMem

The easiest way to solve the undefined behaviour in the post Ongoing Optimization: Unsynchronized access is, to use a lock.

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Views: 13399

Ongoing Optimization: Unsynchronized Access with CppMem

I've described my challenge in the last post. Let' start with our process of ongoing optimization. To be sure, I verify my reasoning with CppMem. I once made a big mistake in my presentation at Meeting C++ 2014.

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Views: 13814

Looking for Proofreaders for my New C++ Book

Something completely different. I'm looking for English proofreaders for my new book.

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Views: 11283

Ongoing Optimization

Now it's time to put the theory into practice. The job is quite easy. A small program should undergo an ongoing optimization.

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Views: 13282

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