Re: Asynchronous I/O using NSFileHandle
Re: Asynchronous I/O using NSFileHandle
- Subject: Re: Asynchronous I/O using NSFileHandle
- From: Shawn Erickson <email@hidden>
- Date: Sat, 27 Jul 2002 07:38:53 -0700
On Saturday, July 27, 2002, at 04:53 AM, Robert Goldsmith wrote:
After all, although you want to get on with other things
you would have no need of trying two i/o's on the same device at
the same time.
FYI... Many modern storage devices (all recent SCSI devices) can handle
several IO requests (read or writes) at the same time. Usually in the
range of 8-32 being the max (with the limit higher for high-end RAIDs,
64-256+).
If you are an IO bound application it is best to try allowing for
multiple IOs in flight at the same time (a reasonable number of IOs for
what you are doing).
Granted this doesn't work for all devices but the kernel drivers should
queue as needed.
-Shawn
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