Re: How to get a sustained read speed under OS X
Re: How to get a sustained read speed under OS X
- Subject: Re: How to get a sustained read speed under OS X
- From: Jeff Moore <email@hidden>
- Date: Thu, 3 Jun 2004 13:04:18 -0700
Using the VM system in this way won't really help since the bottleneck
is the drive mechanism. Even with the extremely high priority of the VM
paging thread, the Finder's requests will still get into the queue and
slow things down. Plus, this is almost a perfect recipe to make audio
glitch and other real time tasks choke as VM paging thread is higher
priority than a real time thread. Finally, VM reads/writes are always
cached and that's a lot more CPU bandwidth getting chew up over the
same non-cached IO operation.
In short using (abusing?) the VM system like this is not the way to get
high performance disk IO on Mac OS X.
On Jun 3, 2004, at 12:47 PM, Matthew Xavier Mora wrote:
Have you tried file mapping the file and just touch the pages a head
of where you need them? The VM pager has the highest priority I
believe.
--
Jeff Moore
Core Audio
Apple
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