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Re: allocation block size

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Re: allocation block size

Subject: Re: allocation block size
From: Brendan Younger <email@hidden>
Date: Wed, 14 Nov 2007 15:05:40 -0600


On Nov 14, 2007, at 2:06 PM, Paul Wasmund wrote:

What is a simple way to get the allocation block size of a volume?

Paul Wasmund

The stat(2) syscall will give you a st_blksize field. Also, CoreServices's FSGetVolumeInfo returns an FSVolumeInfo struct with a blockSize field. If you're trying to optimize I/O performance, bear in mind that nowadays it's better to make it easy on the VM system to map dirty pages to disk. This means sending page-aligned data in multiples of 4K. See <http://developer.apple.com/documentation/Performance/Conceptual/FileSystem/index.html?http://developer.apple.com/documentation/Performance/Conceptual/FileSystem/Articles/FilePerformance.html >.

Brendan Younger
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  >allocation block size (From: Paul Wasmund <email@hidden>)




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