Changeset 74826

Timestamp:

Oct 8, 2011, 9:58:10 PM (11 years ago)

Author:

chris_kohlhoff

Message:

Various performance improvements:

• Split the task_io_service's run and poll code.

• Use thread-local operation queues in single-threaded use cases (i.e. concurrency_hint is 1) to eliminate a lock/unlock pair.

• Only fence block exit when a handler is being run directly out of the io_service.

• Prefer x86 mfence-based fenced block when available.

• Use a plain ol' long for the atomic_count when all thread support is disabled.

• Allow some epoll_reactor speculative operations to be performed without holding the lock.

• Improve locality of reference by performing an epoll_reactor's I/O operation immediately before the corresponding handler is called. This also improves scalability across CPUs when multiple threads are running the io_service.

• Pass same error_code variable through to each operation's complete() function.

• Optimise creation of and access to the io_service implementation.

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