24-core CPU and I can’t type an email

Re:24-core CPU and I can’t type an email by fulafel on Friday August 17, 2018 @02:16AM (#17780651)

The "C++, threads and locks" programming model is inherently performance-unpredictable, since a high priority thread can't interrupt a low priority thread holding a lock to a contended resource.

The field has made progress in "figuring out" the general problem in the form of other programming models but that stuff is not close to gaining popularity on the desktop. Things like STM, lockless peristent data structures, and shared-nothing concurrency.

There are also attempts to make C++ & locks real-time friendly, but the programming model is already prohibitively hard wrt correctness, and the added complexity explosion from handling aborted locks would make it completely unmanageable.

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Re:24-core CPU and I can’t type an email by speedplane on Friday August 17, 2018 @02:49AM (#17780782)

The C++ (and many other languages) model of threads and locks have clearly proven overly complex and bug prone. It's incredibly easy to write software with race conditions and incredibly difficult to debug.

The best advance in recent years, is recognizing that most latency is due to network access, and using single-threaded, but asynchronous models like in javascript. It definitely does not remove race conditions, but makes them much easier to understand and debug.

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Re:24-core CPU and I can’t type an email by devxpy on Friday August 17, 2018 @02:32AM (#17780713)

Yeah,the only sane way to do parallelism is message passing. (preferably using zmq)

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