concurrency

问题 Most CPU architectures will re-order stores-load operations, but my question is why? My interpretation of a store-load barrier would look like this: x = 50; store_load_barrier; y = z; Furthermore, I don't see how this barrier would be have much use in lock-free programming in comparison to release and acquire semantics. 回答1: Short Answer : The store-load barrier prevents the processor from speculatively executing LOAD that come after a store-load barrier until all previous stores have

问题 I am trying to learn concurrency and lambdas in java 8. But my code is not entering lambda block inside map. List<Book> bookList = new ArrayList<Book>(); isbnList .stream() .map(isbn -> (CompletableFuture.supplyAsync( () -> { try { List<String> pageContents = getUrlContents(webLink + isbn); return new Book( parseBookTitle(pageContents), isbn, parseRank(pageContents) ); } catch (IOException ex) { return null; } })).thenApply(a -> bookList.add(a)) ); While debugging, code is exiting at .map

问题 I am trying to learn concurrency and lambdas in java 8. But my code is not entering lambda block inside map. List<Book> bookList = new ArrayList<Book>(); isbnList .stream() .map(isbn -> (CompletableFuture.supplyAsync( () -> { try { List<String> pageContents = getUrlContents(webLink + isbn); return new Book( parseBookTitle(pageContents), isbn, parseRank(pageContents) ); } catch (IOException ex) { return null; } })).thenApply(a -> bookList.add(a)) ); While debugging, code is exiting at .map

问题 While serving a FastAPI request, I have a CPU-bound task to do on every element of a list. I'd like to do this processing on multiple CPU cores. What's the proper way to do this within FastAPI? Can I use the standard multiprocessing module? All the tutorials/questions I found so far only cover I/O-bound tasks like web requests. 回答1: TL;DR You could use loop.run_in_executor with ProcessPoolExecutor to start function at a separate process. loop = asyncio.get_event_loop() with concurrent.futures

来源： https://stackoverflow.com/questions/37312926/writing-concurrently-with-channels

来源： https://stackoverflow.com/questions/37312926/writing-concurrently-with-channels

来源： https://stackoverflow.com/questions/37312926/writing-concurrently-with-channels

来源： https://stackoverflow.com/questions/48854896/concurrent-reads-on-non-atomic-variable

来源： https://stackoverflow.com/questions/22424090/what-difference-between-cudadevicescheduleblockingsync-and-cudadevicescheduleyie

来源： https://stackoverflow.com/questions/8902986/django-celery-execute-only-one-instance-of-a-long-running-process