Re: Speed-optimized file copy
Re: Speed-optimized file copy
- Subject: Re: Speed-optimized file copy
- From: email@hidden
- Date: Tue, 19 Jul 2011 19:18:56 -0500
Quinn wrote:
On 18 Jul 2011, at 21:25, Stevo Brock wrote:
> What are ways that we could improve the efficiency of this system?
o optimise for seeks
This problem seems very similar to one I posted not to long ago in the
thread:
How to read files from disk directly?
http://lists.apple.com/archives/Filesystem-dev/2011/Jul/msg00000.html
Basically, I needed to do something very similar which was to read
every file on disk and process them. In Brock's case, that processing
appears to be writing them to multiple locations.
While reading the files from the disk directly is simply not practical,
attempting to optimize for seeks did look a bit more reasonable.
One possible method involved using fcntl/F_LOG2PHYS to at least try to
determine in which order the start of every file appeared on the disk
and then read the files in that order to try to optimise for seeks.
However, the thread forked into another one:
Problem with fcntl/F_LOG2PHYS (was: Re: How to read files from disk
directly?)
http://lists.apple.com/archives/Filesystem-dev/2011/Jul/msg00022.html
and, as best I can determine, this is not very practical either, but
perhaps I misinterpreted something.
So, what might the recommendation be if one wanted to optimize for
seeks when reading every file in a file system?
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