Re: cache buffer chains/where in code
- From: Tanel Poder <tanel@xxxxxxxxxx>
- To: greg@xxxxxxxxxxxxxxxxxx
- Date: Fri, 20 Nov 2009 14:08:13 +0800
Well that's what i meant by "cpu *starvation*" ;-)
but yeah I get what you mean - it is actually* *possible to get significant
queuing for CPU resource without being 100% utilized over multisecond
utilization averages. One case I've seen is where a queueing/messaging
system invoked bursts of activity by distributing a message to many
processes at a time, causing all of them to wake up and do their short work
at the same time. Using less connections to the database and bundling more
messages into a request solved that issue...
Tanel.
On Fri, Nov 20, 2009 at 1:59 PM, Greg Rahn <greg@xxxxxxxxxxxxxxxxxx> wrote:
> To add further color, latch contention can be a symptom of long CPU
> run queues, not just high processor utilization.
> Often times its the waiting (and holding) that is problematic.
>
> On Thu, Nov 19, 2009 at 8:52 PM, Tanel Poder <tanel@xxxxxxxxxx> wrote:
> > Note that latch contention can also just be a symptom of CPU starvation,
> so
> > if you're running at max physical CPU capacity you should fix that first.
>
> --
> Regards,
> Greg Rahn
> http://structureddata.org
> --
> //www.freelists.org/webpage/oracle-l
>
>
>
--
Tanel Poder
http://blog.tanelpoder.com
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