Re: Minimizing input/output latency ?
Re: Minimizing input/output latency ?
- Subject: Re: Minimizing input/output latency ?
- From: William Stewart <email@hidden>
- Date: Tue, 19 Apr 2005 14:13:36 -0700
On 19/04/2005, at 1:55 PM, Stéphane LETZ wrote:
On 19 avr. 05, at 21:45, William Stewart wrote:
On 19/04/2005, at 11:45 AM, Stéphane Letz wrote:
Le 19 avr. 05, à 20:10, William Stewart a écrit :
<deleted blah blah blah> ;-)
Thanks a lot Bill, I think this is exactly what I needed...
In my case where an IO callback uses the output buffer computed
at the *previous* cycle, i have an almost constant and low IO
processing cost, something like:
- read Input buffers
- do some minimal processing (that I can guaranty to be time
bounded in my application because actual processing is done in
another thread)
- write output buffers from the previous cycle.
Thus I should be able to use an I/OUsage value that almost
exactly represent what percentage of the IO cycle my application
cycle represent, in this case a *low* I/OUsage and it should
gain almost one entire buffer size latency...
Is this correct?
Yes, exactly.
Thanks.
Can this I/OUsage property be set while the device is running or
only before starting it?
Should be whilst its not running I think but it will take on a
running device - if its running you will get a discontinuity of
course because you are shifting the time when output will be "played"
Are we allowed to ask specific questions on Tiger now ((-: ?
of course not
Bill
Since you were speaking about Tiger new stuff I was hoping we could
also...
:-) bad attempt at humour (won't give up my day job)... Sure, ask
away. If we have to wait for some reason, I'll let you know... Always
better to let us do the censoring than to censor yourself I think
Bill
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