Re: [OT] Mail hangs real-time processes
Re: [OT] Mail hangs real-time processes
- Subject: Re: [OT] Mail hangs real-time processes
- From: Robert Abernathy <email@hidden>
- Date: Fri, 9 Jan 2004 00:54:24 +0000
Turning journaling off didn't solve the problem I was having. To solve
it I had to change the disk access patterns of my program.
The problem is a bit strange because it happens on newer machines, yet
I can't cause it to happen on my aging powerbook. It was inconsistent
as to which machines it would happen on. Journaling just seemed to be
a common element.
I can't say that it doesn't contribute to the problem, but my bug could
be gotten around without turning journaling off.
Rob
On 8 Jan 2004, at 10:43 pm, Jeff Moore wrote:
As far as I know, journaling is a per volume kind of thing so you
can't do it on an individual file. You might post the question to
Darwin-Dev and see what sort of response it gets.
That said, if all you're doing is reading from files, then I don't
think that journaling has any effect at all. The time it would come up
is when it is modifying files I think.
On Jan 8, 2004, at 1:33 PM, Herbie Robinson wrote:
I hadn't thought about journaling. It is true that for certain usage
patterns, journaling will bleed some performance away. But I don't
think that it will be a whole lot typically. However, I haven't seen
any sort of investigation into how much performance gets bled away.
I guess the best thing to do is to use Disk Utility and turn it off
and see if performance gets any better.
Is there a way to turn journaling off on a per file basis. Or put a
file into a mode where disk extent allocation is journaled, but not
the data updates?
--
Jeff Moore
Core Audio
Apple
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