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![aio初始化，以及创建I/O线程os_aio_init(io_limit,srv_n_read_io_threads,srv_n_write_io_threads, SRV_MAX_N_PENDING_SYNC_IOS);/* Create i/o-handler threads: */ for (i = 0; i < srv_n_file_io_threads; i++) { n[i] = i;os_thread_create(io_handler_thread, n + i, thread_ids + i); }](https://image.slidesharecdn.com/mysqlaio-110819003808-phpapp02/75/MySQL-aio-7-2048.jpg)
MySQL aio
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- 7. aio初始化，以及创建I/O线程os_aio_init(io_limit,srv_n_read_io_threads,srv_n_write_io_threads, SRV_MAX_N_PENDING_SYNC_IOS);/* Create i/o-handler threads: */ for (i = 0; i < srv_n_file_io_threads; i++) { n[i] = i;os_thread_create(io_handler_thread, n + i, thread_ids + i); }
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- 17. 好处与前提最耗时的os i/o操作，io thread不会持有mutex，减少了mutex争用read/writeaio array里存在多个segments,提高了并发os_aio_read_arrayos_aio_write_array前提：一个io线程只能操作对应的一个segment,其它io线程无法访问这个segment
- 18. aio的生产者Fil_io/* Queue theaio request */ret = os_aio(type, mode | wake_later, node->name, node->handle, buf,offset_low, offset_high, len, node, message);
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