aio vs sync io
Posted May 28, 2005 22:20 UTC (Sat) by Nir
Parent article: Kernel Summit: Asynchronous I/O
i have been testing aio vs synchronous io and i came to conclude that aio is not doing the job. the test was as follows, i have created big buffers for fetching data from the disks ( 4 MB ) and submitted 200 requests . I have done it synchronously and asynchnrously and the async io seems to be 5 times slower, at least.
Also, and this is just a side remark, linux seems to wasting cpu when it comes to io. no matter whether it is sync io or async io.
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