Re: High bandwidth disk management techniques
Re: High bandwidth disk management techniques
- Subject: Re: High bandwidth disk management techniques
- From: philippe wicker <email@hidden>
- Date: Mon, 9 May 2005 09:24:22 +0200
Hi all,
To follow on this topic.
In the updated for Tiger "File System Performance Tips" it is **recommended** to use concurrent asynchronous I/O. Here is what is written page 12:
Mac OS X version 10.4 and later implements true asynchronous I/O operations in Carbon File Manager
routines. In previous versions of the Carbon File Manager, asynchronous I/O operations were offloaded
to a separate thread, which queued I/O requests and performed them sequentially. Now, changes to
the kernel allow those same operations to be performed in parallel.
With pre-tiger releases, the kernel was not truly multi-threaded. Operations that wanted to do I/Os (except network I/Os for which there was a specific funnel) had to take an I/O lock (I/O funnel). It appears that the lock grain is much finer now. Maybe the asynchronous way could give better results now.
Philippe
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